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| MCP98242 Memory Module Temperature Sensor w/ EEPROM for SPD Features * * * * * * Temperature Sensor + 256 Byte Serial EEPROM EEPROM for Serial Presence Detect (SPD) Optimized for Voltage Range: 3.0V to 3.6V Shutdown/Standby Current: 3 A (max.) 2-wire Interface: I2CTM/SMBusTM-Compatible Available Packages: TSSOP-8, DFN-8 Description Microchip Technology Inc.'s MCP98242 digital temperature sensor converts temperature from -40C and +125C to a digital word. This sensor meets JEDEC Specification JC42.4 Mobile Platform Memory Module Thermal Sensor Component. It provides an accuracy of 0.5C/1C (typ./max.) from +75C to +95C. In addition, this device has an internal 256 Byte EEPROM which can be used to store memory module and vendor information. The MCP98242 digital temperature sensor comes with user-programmable registers that provide flexibility for DIMM temperature-sensing applications. The registers allow user-selectable settings such as Shutdown or Low-Power modes and the specification of temperature event and critical output boundaries. When the temperature changes beyond the specified boundary limits, the MCP98242 outputs an Event signal. The user has the option of setting the Event output signal polarity as either an active-low or active-high comparator output for thermostat operation, or as a temperature event interrupt output for microprocessor-based systems. The Event output can also be configured as a critical temperature output. The EEPROM is designed specifically for DRAM DIMMs (Dual In-line Memory Modules) Serial Presence Detect (SPD). The lower 128 bytes (address 00h to 7Fh) can be Permanent Write Protected (PWP) or Software Reversible Write Protected (SWP). This allows DRAM vendor and product information to be stored and write protected. The upper 128 bytes (address 80h to FFh) can be used for general purpose data storage. These addresses are not write protected. This sensor has an industry standard 2-wire, I2C/SMBus compatible serial interface, allowing up to eight devices to be controlled in a single serial bus. To maintain interchangeability with the I2C/SMBus interface the electrical specifications are specified with the operating voltage of 3.0V to 3.6V. In addition, a 40 ms (typ.) time out is implemented. Temperature Sensor Features * Temperature-to-Digital Converter * Operating Current: 200 A (typ.) * Accuracy: - 0.5C/1C (typ./max.) +75C to +95C - 1C/2C (typ./max.) +40C to +125C - 2C/3C (typ./max.) -20C to +125C Serial EEPROM Features * Operating Current: - Write 1.1 mA (typ.) for 3.5 ms (typ.) - Read 100 A (typ.) * Permanent and Reversible Software Write Protect * Software Write Protection for the lower 128 bytes * Organized as 1 block of 256 bytes (256x8) Typical Applications * DIMM Modules * Laptops, Personal Computers and Servers * Hard Disk Drives and Other PC Peripherals DIMM MODULE Memory MCP98242 Temperature Sensor + EEPROM * 0.5C (typ.) Sensor * 256 Byte EEPROM for SPD Package Types MCP98242 8-Pin DFN (2x3) VDD 8 Event 7 SCLK 6 1 A0 2 A1 3 A2 4 GND 8-Pin TSSOP A0 1 A1 2 A2 3 GND 4 8 VDD 7 Event 6 SCLK 5 SDA 3.3VDD_SPD SDA SCL Event SDA 5 (c) 2006 Microchip Technology Inc. DS21996A-page 1 MCP98242 1.0 ELECTRICAL CHARACTERISTICS Notice: Stresses above those listed under "Maximum ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Absolute Maximum Ratings VDD.................................................................................. 6.0V Voltage at all Input/Output pins ............... GND - 0.3V to 6.0V Pin A0.................................................... GND - 0.3V to 12.5V Storage temperature .....................................-65C to +150C Ambient temp. with power applied ................-40C to +125C Junction Temperature (TJ)........................................... +150C ESD protection on all pins (HBM:MM) ................. (4 kV:300V) Latch-Up Current at each pin (25C)........................ 200 mA DC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = 3.0V to 3.6V, GND = Ground, SDA/SCL pulled-up to VDD, and TA = -20C to +125C. Parameters Power Supply Operating Voltage Operating Current Temperature Sensor EEPROM write EEPROM read Shutdown Current Power On Reset (POR) Threshold Power Supply Rejection, TA = +25C Temperature Sensor Accuracy +75C < TA +95C +40C < TA +125C -20C < TA +125C TA = -40C Conversion Time 0.25C/bit Event Output (Open-drain) High-level Current (leakage) Low-level Voltage EEPROM Write Cycle (byte/page) Endurance TA = +25C Write Protect High Voltage Thermal Response DFN TSSOP Note 1: tRES tRES -- -- 0.7 1.4 -- -- s s Time to 63% (89C) 25C (Air) to 125C (oil bath) tWC -- VHI_WP -- 1M 8 3 -- -- 5 -- 12 ms V -- Applied at A0 pin, Note 1 cycles VDD = 5V, Note 1 IOH VOL -- -- -- -- 1 0.4 A V VOH = VDD IOL= 3 mA tCONV -- 65 125 ms 15 s/sec (typ.) (See Section 5.2.3.2) TACY TACY TACY TACY -1.0 -2.0 -3.0 -- 0.5 1 2 -2 +1.0 +2.0 +3.0 -- C C C C IDD IDD IDD ISHDN VPOR VPOR C/VDD C/VDD -- -- -- -- -- -- -- -- 200 1100 100 1 2.3 1.6 0.4 0.15 500 2000 500 3 -- -- -- -- A A A A V V C/V C EEPROM Inactive Sensor in Shutdown Mode (for tWC) Sensor in Shutdown Mode EEPROM Inactive, Sensor in Shutdown Mode Temperature Sensor (VDD falling) EEPROM (VDD falling) (see Section 5.4) VDD = 3.0V to 3.6V VDD = 3.3V+150 mVPP AC (0 to 1 MHz) VDD 3.0 -- 3.6 V Sym Min Typ Max Unit Conditions Characterized but not production tested. DS21996A-page 2 (c) 2006 Microchip Technology Inc. MCP98242 INPUT/OUTPUT PIN DC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = 3.0V to 3.6V, GND = Ground and TA = -20C to +125C. Parameters Input High-level Voltage Low-level Voltage Input Current Output (SDA) Low-level Voltage High-level Current (leakage) Low-level Current Capacitance SDA and SCL Inputs Hysteresis VHYST -- 0.5 -- V Note: The serial inputs do not load the serial bus for VDD range of 1.8V to 5.5V. VOL IOH IOL CIN -- -- 6 -- -- -- -- 5 0.4 1 -- -- V A mA pF IOL= 3 mA VOH = VDD VOL = 0.6V VIH VIL IIN 2.1 -- -- -- -- -- -- 0.8 5 V V A Sym Min Typ Max Units Conditions Serial Input/Output (SCL, SDA, A0, A1, A2) GRAPHICAL SYMBOL DESCRIPTION OUTPUT Voltage VDD INPUT VIH VIL Voltage VDD VOL IOL Current IIN time Current IOH time TEMPERATURE CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = 3.0V to 3.6V, GND = Ground. Parameters Temperature Ranges Specified Temperature Range Operating Temperature Range Storage Temperature Range Thermal Package Resistances Thermal Resistance, 8L-TSSOP Thermal Resistance, 8L-DFN Note 1: JA JA -- -- 123.7 41 -- -- C/W C/W TA TA TA -20 -40 -65 -- -- -- +125 +125 +150 C C C (Note 1) Sym Min Typ Max Units Conditions Operation in this range must not cause TJ to exceed Maximum Junction Temperature (+150C). (c) 2006 Microchip Technology Inc. DS21996A-page 3 MCP98242 SENSOR AND EEPROM SERIAL INTERFACE TIMING SPECIFICATIONS Electrical Specifications: Unless otherwise indicated, VDD = 3.0V to 3.6V, GND = Ground, TA = -20C to +125C, CL = 80 pF, and all limits measured to 50% point. Parameters Serial Port Frequency Low Clock High Clock Rise Time Fall Time Data Setup Before SCLK High Data Hold After SCLK Low Start Condition Setup Time Start Condition Hold Time Stop Condition Setup Time Bus Idle Time Out Sym fSC tLOW tHIGH tR tF tSU-DATA tH-DATA tSU-START tH-START tSU-STOP tB_FREE tOUT Min 10 4.7 4.0 -- -- 250 300 4.7 4.0 4.0 4.7 25 Typ -- -- -- -- -- -- -- -- -- -- -- 40 Max 100 -- -- 1000 300 -- -- -- -- -- -- 50 Units kHz s s ns ns ns ns s s s s ms Temp. Sensor Only (characterized but not production tested) (VIL MAX - 0.15V) to (VIH MIN + 0.15V) (VIH MIN + 0.15V) to (VIL MAX 0.15V) I2C/SMBus Conditions 2-Wire I2C/SMBus-Compatible Interface TIMING DIAGRAM -S TA R T -S TA R T IG tS tH O U tH SD A SC LK tO U T AT A -D U tS Start Condition tH Data Transmission -D AT A tR ,t F tL Stop Condition DS21996A-page 4 (c) 2006 Microchip Technology Inc. tS tB -S TO P -F R EE H U W MCP98242 2.0 Note: TYPICAL PERFORMANCE CURVES The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. Note: Unless otherwise indicated, VDD = 3.0V to 3.6V, GND = Ground, SDA/SCL pulled-up to VDD, and TA = -20C to +125C. 3.0 Temperature Accuracy (C) 2.0 1.0 0.0 -1.0 -2.0 -3.0 -40 -20 0 20 40 60 TA (C) 80 100 120 VDD= 3.0V to 3.6V 10000 1000 IDD (A) Spec. Limits VDD = 3.3V to 3.6V EEPROM Write (Sensor in Shutdown Mode) 100 10 Sensor (EEPROM Inactive) EEPROM Read (Sensor in Shutdown Mode) 1 -40 -20 0 20 40 60 TA (C) 80 100 120 FIGURE 2-1: Accuracy. 70% 60% Occurrences 50% 40% 30% 20% 10% 0% -1.00 -0.75 -0.50 TA = +95C VDD = 3.3V 221 units Average Temperature FIGURE 2-4: Temperature. 3.00 Supply Current vs. VDD = 3.0V to 3.6V 2.50 ISHDN (A) -0.25 0.00 0.25 0.50 0.75 1.00 2.00 1.50 1.00 0.50 0.00 -40 -20 0 20 40 60 TA (C ) 80 100 120 Temperature Accuracy (C) FIGURE 2-2: Temperature Accuracy Histogram, TA = +95C. 70% 60% Occurrences 50% 40% 30% 20% 10% 0% -1.00 -0.75 -0.50 -0.25 0.00 0.25 0.50 0.75 1.00 TA = +75C VDD = 3.3V 221 units FIGURE 2-5: Temperature. Shutdown Current vs. 3 2.5 VPOR (V) 2 1.5 1 0.5 0 -40 -20 0 20 40 60 TA (C) 80 100 120 Temperature Accuracy (C) FIGURE 2-3: Temperature Accuracy Histogram, TA = +75C. FIGURE 2-6: Power-on Reset Threshold Voltage vs. Temperature. (c) 2006 Microchip Technology Inc. DS21996A-page 5 MCP98242 Note: Unless otherwise indicated, VDD = 3.0V to 3.6V, GND = Ground, SDA/SCL pulled-up to VDD, and TA = -20C to +125C. 0.4 Event & SDA V OL (V) 0.3 0.2 SDA 48 VDD = 3.0V to 3.6V IOL = 3 mA 42 SDA I OL (mA) 36 30 24 18 12 6 80 100 120 VDD = 3.0V to 3.6V VOL = 0.6V 0.1 Event 0 -40 -20 0 20 40 60 TA (C) -40 -20 0 20 40 60 TA (C) 80 100 120 FIGURE 2-7: Temperature. Event and SDA VOL vs. FIGURE 2-10: SDA IOL vs. Temperature. VDD = 3.0V to 3.6V Temperature Accuracy (C) 125 110 tCONV (ms) 95 80 65 50 35 -40 3.0 2.0 1.0 0.0 -1.0 -2.0 -3.0 VDD = 3.0V VDD = 3.6V C/ VDD = 0.4C/V -20 0 20 40 60 TA (C) 80 100 120 -40 -20 0 20 40 60 TA (C) 80 100 120 FIGURE 2-8: Temperature. 1.0 Conversion Rate vs. FIGURE 2-11: VDD. 120% Thermal Response (%) Temperature Accuracy vs. Normalized Temp. Error (C) C/ VDD, VDD = 3.3V + 150 mVPP (AC) TA = 25C 100% 80% 60% 40% 20% 0% -2 0 2 4 6 8 Time (s) 10 12 14 16 TSSOP-8 DFN-8 22C (Air) to 125C (Oil bath) 0.5 0.0 -0.5 No decoupling capacitor -1.0 100 100 1,000 1k 1k 10,000 10k 10k 100,000 100k 100k 1,000,000 1M 1M Frequency (Hz) FIGURE 2-9: Frequency. Power Supply Rejection vs. FIGURE 2-12: Response. Package Thermal DS21996A-page 6 (c) 2006 Microchip Technology Inc. MCP98242 3.0 PIN DESCRIPTION The descriptions of the pins are listed in Table 3-1. TABLE 3-1: DFN/TSSOP 1 2 3 4 5 6 7 8 PIN FUNCTION TABLES Symbol A0 A1 A2 GND SDA SCLK Event VDD Pin Function Slave Address Slave Address Slave Address Ground Serial Data Line Serial Clock Line Temperature Alert Output Power Pin Package Type 8-Pin TSSOP A0 1 A1 2 A2 3 GND 4 8 VDD 7 Event 6 SCLK 5 SDA 3.1 Address Pins (A2, A1, A0) 3.4 Serial Clock Line (SCLK) These pins are device address input pins. The address pins correspond to the Least Significant bits (LSb) of address bits. The Most Significant bits (MSb) (A6, A5, A4, A3). This is shown in Table 3-2. The SCLK is a clock input pin. All communication and timing is relative to the signal on this pin. The clock is generated by the host or master controller on the bus. (See Section 4.0 "Serial Communication"). TABLE 3-2: Device MCP98242 ADDRESS BYTE Address Code A6 A5 0 0 1 A4 1 1 1 A3 1 0 0 X X X Slave Address A2 A1 A0 3.5 Open-Drain Temperature Alert Output (Event) Sensor EEPROM EEPROM Write Protect Note: 0 1 0 The MCP98242 Event pin is an open-drain output. The device outputs a signal when the ambient temperature goes beyond the user-programmed temperature limit. (see Section 5.2.3 "Event Output Configuration"). 3.6 Power Pin (VDD) User-selectable address is shown by X. 3.2 Ground Pin (GND) VDD is the power pin. The operating voltage range, as specified in the DC electrical specification table, is applied on this pin. The GND pin is the system ground pin. 3.3 Serial Data Line (SDA) SDA is a bidirectional input/output pin, used to serially transmit data to/from the host controller. This pin requires a pull-up resistor. (See Section 4.0 "Serial Communication"). (c) 2006 Microchip Technology Inc. DS21996A-page 7 MCP98242 4.0 4.1 SERIAL COMMUNICATION 2-Wire SMBus/Standard Mode I2CTM Protocol-Compatible Interface 4.1.1 DATA TRANSFER Data transfers are initiated by a Start condition (START), followed by a 7-bit device address and a read/write bit. An Acknowledge (ACK) from the slave confirms the reception of each byte. Each access must be terminated by a Stop condition (STOP). Repeated communication is initiated after tB-FREE. This device does not support sequential register read/write. Each register needs to be addressed using the Register Pointer. This device supports the Receive Protocol. The register can be specified using the pointer for the initial read. Each repeated read or receive begins with a Start condition and address byte. The MCP98242 retains the previously selected register. Therefore, it outputs data from the previously-specified register (repeated pointer specification is not necessary). The MCP98242 serial clock input (SCLK) and the bidirectional serial data line (SDA) form a 2-wire bidirectional SMBus/Standard mode I2C compatible communication port (refer to the Input/Output Pin DC Characteristics Table and Sensor And EEPROM Serial Interface Timing Specifications Table). The following bus protocol has been defined: TABLE 4-1: Term Master Slave MCP98242 SERIAL BUS PROTOCOL DESCRIPTIONS Description The device that controls the serial bus, typically a microcontroller. The device addressed by the master, such as the MCP98242. Device receiving data from the bus. A unique signal from master to initiate serial interface with a slave. A unique signal from the master to terminate serial interface from a slave. 4.1.2 MASTER/SLAVE Transmitter Device sending data to the bus. Receiver START STOP The bus is controlled by a master device (typically a microcontroller) that controls the bus access and generates the Start and Stop conditions. The MCP98242 is a slave device and does not control other devices in the bus. Both master and slave devices can operate as either transmitter or receiver. However, the master device determines which mode is activated. 4.1.3 START/STOP CONDITION Read/Write A read or write to the MCP98242 registers. ACK A receiver Acknowledges (ACK) the reception of each byte by polling the bus. A receiver Not-Acknowledges (NAK) or releases the bus to show End-of-Data (EOD). Communication is not possible because the bus is in use. The bus is in the idle state, both SDA and SCLK remain high. SDA must remain stable before SCLK becomes high in order for a data bit to be considered valid. During normal data transfers, SDA only changes state while SCLK is low. A high-to-low transition of the SDA line (while SCLK is high) is the Start condition. All data transfers must be preceded by a Start condition from the master. If a Start condition is generated during data transfer, the MCP98242 resets and accepts the new Start condition. A low-to-high transition of the SDA line (while SCLK is high) signifies a Stop condition. If a Stop condition is introduced during data transmission, the MCP98242 releases the bus. All data transfers are ended by a Stop condition from the master. NAK Busy Not Busy Data Valid 4.1.4 ADDRESS BYTE Following the Start condition, the host must transmit an 8-bit address byte to the MCP98242. The address for the MCP98242 Temperature Sensor is `0011,A2,A1,A0' in binary, where the A2, A1 and A0 bits are set externally by connecting the corresponding pins to VDD `1' or GND `0'. The 7-bit address transmitted in the serial bit stream must match the selected address for the MCP98242 to respond with an ACK. Bit 8 in the address byte is a read/write bit. Setting this bit to `1' commands a read operation, while `0' commands a write operation (see Figure 4-1). DS21996A-page 8 (c) 2006 Microchip Technology Inc. MCP98242 Address Byte SCLK 1 2 3 4 5 6 7 8 9 A C K 4.1.6 ACKNOWLEDGE (ACK) Each receiving device, when addressed, is obliged to generate an ACK bit after the reception of each byte. The master device must generate an extra clock pulse for ACK to be recognized. The acknowledging device pulls down the SDA line for tSU-DATA before the low-to-high transition of SCLK from the master. SDA also needs to remain pulled down for tH-DATA after a high-to-low transition of SCLK. During read, the master must signal an End-of-Data (EOD) to the slave by not generating an ACK bit (NAK) once the last bit has been clocked out of the slave. In this case, the slave will leave the data line released to enable the master to generate the Stop condition. SDA Start 0 0 1 1 A2 A1 A0 Slave Address Address Code R/W MCP98242 Response FIGURE 4-1: 4.1.5 Device Addressing. DATA VALID After the Start condition, each bit of data in transmission needs to be settled for a time specified by tSU-DATA before SCLK toggles from low-to-high (see "Sensor And EEPROM Serial Interface Timing Specifications" on Page 4). 4.1.7 TIME OUT (MCP98242) If the SCLK stays low or high for time specified by tOUT, the MCP98242 temperature sensor resets the serial interface. This dictates the minimum clock speed as specified in the SMBus specification. However, the EEPROM does not reset the serial interface. Therefore, the master can hold the clock indefinitely to process data from the EEPROM. (c) 2006 Microchip Technology Inc. DS21996A-page 9 MCP98242 5.0 FUNCTIONAL DESCRIPTION The MCP98242 temperature sensors consists of a band-gap type temperature sensor, a Delta-Sigma Analog-to-Digital Converter ( ADC), user-programmable registers and a 2-wire I2C/SMBus protocol compatible serial interface. Figure 5-1 shows a block diagram of the register structure. Temperature Sensor Hysteresis Shutdown Critical Trip Lock Alarm Win. Lock Bit Clear Event Event Status Output Control Critical Event only Event Polarity Event Comp/Int Configuration Temperature TUPPER TLOWER TCRIT Manufacturer ID Device ID/Rev Resolution Capability Selected Resolution Temp. Range Accuracy Output Feature Register Pointer 0.5C/bit 0.25C/bit 0.125C/bit 0.0625C/bit Memory Control Logic ADC Band-Gap Temperature Sensor EEPROM HV Generator Write Protected Array (00h-7Fh) Address Decoder X Standard Array (80h-FFh) Write Protect Circuitry Address Decoder Y Sense Amp R/W Control SMBus/Standard I2C Interface A0 A1 A2 Event SDA SCL VDD GND FIGURE 5-1: Functional Block Diagram. (c) 2006 Microchip Technology Inc. DS21996A-page 10 MCP98242 5.1 Registers The MCP98242 has several registers that are user-accessible. These registers include the Capability register, Configuration register, Event Temperature Upper-Boundary and Lower-Boundary Trip registers, Critical Temperature Trip register, Temperature register, Manufacturer Identification register and Device Identification register. The Temperature register is read-only, used to access the ambient temperature data. The data is loaded in parallel to this register after tCONV. The Event Temperature Upper-Boundary and Lower-Boundary Trip registers are read/writes. If the ambient temperature drifts beyond the user-specified limits, the MCP98242 outputs a signal using the Event pin (refer to Section 5.2.3 "Event Output Configuration"). In addition, the Critical Temperature Trip register is used to provide an additional critical temperature limit. The Capability register is used to provide bits describing the MCP98242's capability in measurement resolution, measurement range and device accuracy. The device Configuration register provides access to configure the MCP98242's various features. These registers are described in further detail in the following sections. The registers are accessed by sending a Register Pointer to the MCP98242 using the serial interface. This is an 8-bit write-only pointer. However, the three Least Significant bits are used as pointers and all unused bits (bits 7-3) need to be cleared or set to `0'. Register 5-1 describes the pointer or the address of each register. REGISTER 5-1: W-0 -- bit 7 Legend: R = Readable bit -n = Value at POR bit 7-4 REGISTER POINTER (WRITE ONLY) W-0 -- W-0 -- W-0 -- W-0 W-0 W-0 W-0 bit 0 Pointer Bits W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Writable Bits: Write `0'' Bits 7-3 must always be cleared or written to `0'. This device has additional registers that are reserved for test and calibration. If these registers are accessed, the device may not perform according to the specification. Pointer Bits: 0000 = Capability register 0001 = Configuration register (CONFIG) 0010 = Event Temperature Upper-Boundary Trip register (TUPPER) 0011 = Event Temperature Lower-Boundary Trip register (TLOWER) 0100 = Critical Temperature Trip register (TCRIT) 0101 = Temperature register (TA) 0110 = Manufacturer ID register 0111 = Device ID/Revision register 1000 = Resolution register 1XXX = Reserved bit 3-0 (c) 2006 Microchip Technology Inc. DS21996A-page 11 MCP98242 TABLE 5-1: Register Pointer (Hex) 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 MSB/ LSB MSB LSB MSB LSB MSB LSB MSB LSB MSB LSB MSB LSB MSB LSB MSB LSB LSB BIT ASSIGNMENT SUMMARY FOR ALL REGISTERS (SEE SECTION 5.4) Bit Assignment 7 0 0 0 Crt Loc 0 23C 0 23C 0 23C TA TCRIT 23C 0 0 0 0 0 6 0 0 0 Win Loc 0 22C 0 22C 0 22C TA > TUPPER 22C 0 1 0 0 0 5 0 0 0 Int Clr 0 21C 0 21C 0 21C TA < TLOWER 21C 0 0 1 0 0 0 Evt Stat SIGN 20C SIGN 20C SIGN 20C SIGN 20C 0 1 0 0 0 4 0 Resolution 0 Evt Cnt 27C 2-1C 27C 2-1C 27C 2-1C 27C 2-1C 0 0 0 0 0 3 0 2 0 Range Evt Sel 26C 2-2C 26C 2-2C 26C 2-2C 26C 2-2C 0 1 0 0 0 Hysteresis Evt Pol 25C 0 25C 0 25C 0 25C 0 0 0 0 0 0 1 0 Accuracy 0 0 Event SHDN Evt Pol 24C 0 24C 0 24C 0 24C 0 0 0 0 0 1 0x08 DS21996A-page 12 (c) 2006 Microchip Technology Inc. MCP98242 5.1.1 CAPABILITY REGISTER This is a read-only register used to identify the temperature sensor capability. In this case, the MCP98242 is capable of providing temperature at 0.25C resolution, measuring temperature below and above 0C, providing 1C and 2C accuracy over the active and monitor temperature ranges (respectively) and providing user-programmable temperature event boundary trip limits. Register 5-2 describes the Capability register. These functions are described in further detail in the following sections. REGISTER 5-2: U-0 -- bit 15 U-0 -- bit 7 Legend: R = Readable bit -n = Value at POR bit 15-5 bit 4-3 CAPABILITY REGISTER (READ-ONLY) ADDRESS `0000 0000'b U-0 -- U-0 -- U-0 -- U-0 -- U-0 -- U-0 -- U-0 -- bit 8 U-0 -- U-0 -- R-0 R-1 R-1 Meas Range R-1 Accuracy R-1 Temp Alarm bit 0 Resolution W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Unimplemented: Read as `0' Resolution: 00 = 0.5C 01 = 0.25C (power up default) 10 = 0.125C 11 = 0.0625C These bits reflect the selected resolution (see Section 5.2.3.2 "Temperature Resolution") 0= 1= bit 2 Temperature Measurement Range (Meas. Range): TA = 0 (decimal) for temperature below 0C The part can measure temperature below 0C (power up default) bit 1 Accuracy: Accuracy 2C from +75C to +95C (Active Range) and 3C from +40C to +125C (Monitor Range) 1 = Accuracy 1C from +75C to +95C (Active Range) and 2C from +40C to +125C (Monitor Range) 0= bit 0 Temperature Alarm: 0 = No defined function (This bit will never be cleared or set to `0'). 1 = The part has temperature boundary trip limits (TUPPER/TLOWER/TCRIT registers) and a temperautre event output (JC 42.4 required feature). (c) 2006 Microchip Technology Inc. DS21996A-page 13 MCP98242 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A A C K SDA S 0 0 1 1 WC K 0 0 0 0 0 0 0 0 Address Byte MCP98242 1 2 3 4 5 6 7 8 Capability Pointer MCP98242 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K A C K N AP K SDA S 0 0 1 1 RC0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 Address Byte MCP98242 MSB Data Master LSB Data Master FIGURE 5-2: Timing Diagram for Reading the Capability Register (See Section 4.0 "Serial Communication"). DS21996A-page 14 (c) 2006 Microchip Technology Inc. MCP98242 5.1.2 SENSOR CONFIGURATION REGISTER (CONFIG) The MCP98242 has a 16-bit Configuration register (CONFIG) that allows the user to set various functions for a robust temperature monitoring system. Bits 10 thru 0 are used to select Event output boundary hysteresis, device Shutdown or Low-Power mode, temperature boundary and critical temperature lock, temperature Event output enable/disable. In addition, the user can select the Event output condition (output set for TUPPER and TLOWER temperature boundary or TCRIT only), read Event output status and set Event output polarity and mode (Comparator Output or Interrupt Output mode). The temperature hysteresis bits 10 and 9 can be used to prevent output chatter when the ambient temperature gradually changes beyond the user-specified temperature boundary (see Section 5.2.2 "Temperature Hysteresis (THYST)". The Continuous Conversion or Shutdown mode is selected using bit 8. In Shutdown mode, the band gap temperature sensor circuit stops converting temperature and the Ambient Temperature register (TA) holds the previous successfully converted temperature data (see Section 5.2.1 "Shutdown Mode"). Bits 7 and 6 are used to lock the user-specified boundaries TUPPER, TLOWER and TCRIT to prevent an accidental rewrite. Bits 5 thru 0 are used to configure the temperature Event output pin. All functions are described in Register 5-3 (see Section 5.2.3 "Event Output Configuration"). REGISTER 5-3: U-0 -- bit 15 R/W-0 Crit. Lock bit 7 Legend: R = Readable bit -n = Value at POR bit 15-11 bit 10-9 CONFIGURATION REGISTER (CONFIG) ADDRESS `0000 0001'b U-0 -- U-0 -- U-0 -- U-0 -- R/W-0 THYST R/W-0 R/W-0 SHDN bit 8 R/W-0 Win. Lock R/W-0 Int. Clear R/W-0 Event Stat. R/W-0 Event Cnt. R/W-0 Event Sel. R/W-0 Event Pol. R/W-0 Event Mod. bit 0 W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Unimplements: Read as `0' TUPPER and TLOWER Limit Hysteresis (THYST): 00 = 0C (power-up default) 01 = 1.5C 10 = 3.0C 11 = 6.0C (Refer to Section 5.2.3 "Event Output Configuration") Shutdown Mode (SHDN): 0 = Continuous Conversion (power-up default) 1 = Shutdown (Low-Power mode) In shutdown, all power-consuming activities are disabled, though all registers can be written to or read. This bit cannot be set `1' when either of the lock bits is set (bit 6 and bit 7). However, it can be cleared `0' for Continuous Conversion while locked. (Refer to Section 5.2.1 "Shutdown Mode") bit 8 bit 7 TCRIT Lock Bit (Crit. Lock): 0 = Unlocked. TCRIT register can be written. (power-up default) 1 = Locked. TCRIT register can not be written When enabled, this bit remains set `1' or locked until cleared by internal reset (Section 5.4 "Summary of Temperature Sensor Power-on Default"). This bit does not require a double-write. (c) 2006 Microchip Technology Inc. DS21996A-page 15 MCP98242 REGISTER 5-3: bit 6 CONFIGURATION REGISTER (CONFIG) ADDRESS `0000 0001'b TUPPER and TLOWER Window Lock Bit (Win. Lock): 0 = Unlocked. TUPPER and TLOWER registers can be written. (power-up default) 1 = Locked. TUPPER and TLOWER registers can not be written When enabled, this bit remains set `1' or locked until cleared by internal reset (Section 5.4 "Summary of Temperature Sensor Power-on Default"). This bit does not require a double-write. bit 5 Interrupt Clear (Int. Clear) Bit: 0 = No effect (power-up default) 1 = Clear interrupt output. When read this bit returns `0' Event Output Status (Event Stat.) Bit: 0 = Event output is not asserted by the device (power-up default) 1 = Event output is asserted as a comparator/Interrupt or critical temperature output Event Output Control (Event Cnt.) Bit: 0 = Disabled (power-up default) 1 = Enabled This bit can not be altered when either of the lock bits is set (bit 6 and bit 7). Event Output Select (Event Sel.) Bit: 0 = Event output for TUPPER, TLOWER and TCRIT (power-up default) 1 = TA > TCRIT only. (TUPPER and TLOWER temperature boundaries are disabled.) When the Alarm Window Lock bit is set, this bit cannot be altered until unlocked (bit 6). Event Output Polarity (Event Pol.) Bit: 0 = Active low (power-up default) 1 = Active-high This bit cannot be altered when either of the lock bits is set (bit 6 and bit 7). Event Output Mode (Event Mod.) Bit: 0 = Comparator output (power-up default) 1 = Interrupt output This bit cannot be altered when either of the lock bits is set (bit 6 and bit 7). bit 4 bit 3 bit 2 bit 1 bit 0 DS21996A-page 16 (c) 2006 Microchip Technology Inc. MCP98242 * Writing to the CONFIG Register to Enable the Event Output pin <0000 0000 0000 1000>b. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K A C K SDA S 0 0 1 1 WC 0 0 0 0 0 0 0 1 Address Byte Configuration Pointer MCP98242 MCP98242 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 0 0 0 0 0 0 0 0 A C K 0 0 0 0 1 0 0 0 A C K P MSB Data MCP98242 LSB Data MCP98242 * Reading the CONFIG Register. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A A C K Note: SDA S 0 0 1 1 WC K 0 0 0 0 0 0 0 1 It is not necessary to select the register pointer if it was set from the previous read/write. Address Byte Configuration Pointer MCP98242 MCP98242 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K A C K N A K SDA S 0 0 1 1 RC 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 P Address Byte MCP98242 MSB Data Master LSB Data Master FIGURE 5-3: Timing Diagram for Writing and Reading from the Configuration Register (See Section 4.0 "Serial Communication"). (c) 2006 Microchip Technology Inc. DS21996A-page 17 MCP98242 5.1.3 UPPER/LOWER/CRITICAL TEMPERATURE LIMIT REGISTERS (TUPPER/TLOWER/TCRIT) The MCP98242 has a 16-bit read/write Event output Temperature Upper-Boundary Trip register (TUPPER), a 16-bit Lower-Boundary Trip register (TLOWER) and a 16-bit Critical Boundary Trip register (TCRIT) that contains 11-bit data in two's complement format (0.25 C). This data represents the maximum and minimum temperature boundary or temperature window that can be used to monitor ambient temperature. If this feature is enabled (Section 5.1.2 "Sensor Configuration Register (CONFIG)") and the ambient temperature exceeds the specified boundary or window, the MCP98242 asserts an Event output. (Refer to Section 5.2.3 "Event Output Configuration"). REGISTER 5-4: U-0 -- bit 15 R/W-0 23C bit 7 Legend: R = Readable bit -n = Value at POR bit 15-13 bit 12 UPPER/LOWER/CRITICAL TEMPERATURE LIMIT REGISTER (TUPPER/TLOWER/TCRIT) ADDRESS `0000 0010'b/`0000 0011'b/`0000 0100'b U-0 -- U-0 -- R/W-0 Sign R/W-0 27C R/W-0 26C R/W-0 25C R/W-0 24C bit 8 R/W-0 22C R/W-0 21C R/W-0 20C R/W-0 2-1C R/W-0 2-2C U-0 -- U-0 -- bit 0 W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Unimplemented: Read as `0' Sign: 0 = TA 0C 1 = TA < 0C TUPPER/TLOWER/TCRIT: Temperature boundary trip data in two's complement format. Unimplemented: Read as `0' This table shows two 16-bit registers for TUPPER, TLOWER and TCRIT located at `0000 0010b', `0000 0011b' and `0000 0100b', respectively. bit 11-2 bit 1-0 Note: DS21996A-page 18 (c) 2006 Microchip Technology Inc. MCP98242 * Writing 90C to the TUPPER Register <0000 0101 1010 0000>b. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K A C K SDA S 0 0 1 1 WC 0 0 0 0 0 0 1 0 Address Byte MCP98242 TUPPER Pointer MCP98242 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 0 0 0 0 0 1 0 1 A C K 1 0 1 0 0 0 0 0 A C K P MSB Data MCP98242 LSB Data MCP98242 * Reading from the TUPPER Register. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A A C K Note: SDA S 0 0 1 1 WC K 0 0 0 0 0 0 1 0 It is not necessary to select the register pointer if it was set from the previous read/write. Address Byte MCP98242 1 2 3 4 5 6 7 8 TUPPER Pointer MCP98242 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K A C K N A K SDA S 0 0 1 1 RC 0 0 0 0 0 1 0 1 1 0 1 0 0 0 0 0 P Address Byte MCP98242 MSB Data Master LSB Data Master FIGURE 5-4: Timing Diagram for Writing and Reading from the TUPPER Register (See Section 4.0 "Serial Communication"). (c) 2006 Microchip Technology Inc. DS21996A-page 19 MCP98242 5.1.4 AMBIENT TEMPERATURE REGISTER (TA) EQUATION 5-1: The MCP98242 uses a band gap temperature sensor circuit to output analog voltage proportional to absolute temperature. An internal ADC is used to convert the analog voltage to a digital word. The converter resolution is set to 0.25 C + sign (11-bit data). The digital word is loaded to a 16-bit read-only Ambient Temperature register (TA) that contains 11-bit temperature data in two's complement format. The TA register bits (bits 12 thru 0) are double-buffered. Therefore, the user can access the register while, in the background, the MCP98242 performs an analog-to-digital conversion. The temperature data from the ADC is loaded in parallel to the TA register at tCONV refresh rate. The TA magnitude in decimal to ambient temperature conversion is shown in Equation 5-1: DECIMAL CODE TO TEMPERATURE CONVERSION T A = Code x 2 -4 Where: TA = Ambient Temperature (C) Code = MCP98242 temperature output magnitude in decimal (bits 0-11) In addition, the TA register uses three bits (bits 15, 14 and 13) to reflect the Event pin state. This allows the user to identify the cause of the Event output trigger (see Section 5.2.3 "Event Output Configuration"); bit 15 is set to `1' if TA is greater than or equal to TCRIT, bit 14 is set to `1' if TA is greater than TUPPER and bit 13 is set to `1' if TA is less than TLOWER. The TA register bit assignment and boundary conditions are described in Register 5-5. REGISTER 5-5: R-0 bit 15 R-0 23 C bit 7 Legend: R = Readable bit -n = Value at POR bit 15 AMBIENT TEMPERATURE REGISTER (TA) ADDRESS `0000 0101'b R-0 R-0 R-0 SIGN R-0 27 C R-0 26 C R-0 25 C R-0 24 C bit 8 R-0 22 C R-0 21 C R-0 20 C R-0 2-1 C R-0 2-2 C R-0 -- R-0 -- bit 0 TA vs. TCRIT TA vs. TUPPER TA vs. TLOWER W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown TA vs. TCRIT (1) Bit: 0 = TA < TCRIT 1 = TA TCRIT TA vs. TUPPER (1) Bit: 0 = TA TUPPER 1 = TA > TUPPER TA vs. TLOWER (1) Bit: 0 = TA TLOWER 1 = TA < TLOWER SIGN Bit: 0 = TA 0C 1 = TA < 0C Ambient Temperature (TA) Bits: 10-bit Ambient Temperature data in two's complement format. TA: Data in 2's complement format. Depending on the status of the Resolution Register (Register 5-8), these bits may display 2-3C (0.125C) and 2-4C (0.0625C), respectively. Not affected by the status of the Event output configuration (bits 5 to 0 of CONFIG) and THYST = 0C, Register 5-3. bit 14 bit 13 bit 12 bit 11-2 bit 1-0 Note 1: DS21996A-page 20 (c) 2006 Microchip Technology Inc. MCP98242 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A A C K Note: SDA S 0 0 1 1 WC K 0 0 0 0 0 1 0 1 It is not necessary to select the register pointer if it was set from the previous read/write. Address Byte MCP98242 TA Pointer MCP98242 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K A C K N A K SDA S 0 0 1 1 RC 0 0 0 0 0 0 0 1 1 0 0 1 0 1 0 0 P Address Byte MCP98242 MSB Data Master LSB Data Master FIGURE 5-5: Timing Diagram for Reading +25.25C Temperature from the TA Register (See Section 4.0 "Serial Communication"). (c) 2006 Microchip Technology Inc. DS21996A-page 21 MCP98242 5.1.5 MANUFACTURER ID REGISTER This register is used to identify the manufacturer of the device in order to perform manufacturer specific operation. The Manufacturer ID for the MCP98242 is 0x0054 (hexadecimal). REGISTER 5-6: R-0 bit 15 R-0 bit 7 Legend: R = Readable bit -n = Value at POR bit 15-0 . MANUFACTURER ID REGISTER (READ-ONLY) ADDRESS `0000 0110'b R-0 R-0 R-0 R-0 R-0 R-0 R-0 bit 8 R-1 R-0 R-1 R-0 R-1 R-0 R-0 bit 0 Manufacturer ID Manufacturer ID W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Device Manufacturer Identification Number 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A A C K Note: SDA S 0 0 1 1 WC K 0 0 0 0 0 1 1 0 It is not necessary to select the register pointer if it was set from the previous read/write. Address Byte MCP98242 Manuf. ID Pointer MCP98242 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K A C K N A K SDA S 0 0 1 1 RC 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 0 P Address Byte MCP98242 MSB Data Master LSB Data Master FIGURE 5-6: Timing Diagram for Reading the Maufacturer ID Register (See Section 4.0 "Serial Communication"). DS21996A-page 22 (c) 2006 Microchip Technology Inc. MCP98242 5.1.6 DEVICE ID AND REVISION REGISTER The upper byte of this register is used to specify the device identification and the lower byte is used to specify device revision. The device ID for the MCP98242 is 0x20 (hex). The revision begins with 0x00 (hex) for the first release, with the number being incremented as revised versions are released. REGISTER 5-7: R-0 bit 15 R-0 bit 7 Legend: R = Readable bit -n = Value at POR bit 15-8 bit 7-0 DEVICE ID AND DEVICE REVISION (READ-ONLY) ADDRESS `0000 0111'b R-0 R-1 R-0 Device ID bit 8 R-0 R-0 R-0 R-0 R-0 R-0 R-0 bit 0 R-0 R-0 R-0 R-0 Device Revision W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Device ID: Bit 15 to bit 8 are used for device ID Device Revision: Bit 7 to bit 0 are used for device revision 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A A C K Note: SDA S 0 0 1 1 WC K 0 0 0 0 0 1 1 1 It is not necessary to select the register pointer if it was set from the previous read/write. Address Byte MCP98242 Device ID Pointer MCP98242 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K A C K N A K SDA S 0 0 1 1 RC 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 P Address Byte MCP98242 MSB Data Master LSB Data Master FIGURE 5-7: Timing Diagram for Reading Device ID and Device Revision Register (See Section 4.0 "Serial Communication"). (c) 2006 Microchip Technology Inc. DS21996A-page 23 MCP98242 5.1.7 RESOLUTION REGISTER This register allows the user to change the sensor resolution (see Section 5.2.3.2 "Temperature Resolution"). The POR default resolution is 0.25C. The selected resolution is also reflected in the Capability register (see Register 5-2). REGISTER 5-8: U-0 -- bit 7 Legend: R = Readable bit -n = Value at POR bit 7-4 bit 3-0 RESOLUTION ADDRESS `0000 1000'b U-0 -- U-0 -- U-0 -- U-0 -- U-0 -- R/W-0 R/W-0 bit 0 Resolution W = Writable bit `1' = Bit is set U = Unimplemented bit, read as `0' `0' = Bit is cleared x = Bit is unknown Unimplemented: Read as `0' Resolution: 00 = LSB = 0.5C (tCONV = 30 ms typ.) 01 = LSB = 0.25C (power up default, tCONV = 65 ms typ.) 10 = LSB = 0.125C (tCONV = 130 ms typ.) 11 = LSB = 0.0625C (tCONV = 260 ms typ.) 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K A C K A C K SDA S 0 0 1 1 WC 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 1 P Address Byte Resolution Pointer MCP98242 MCP98242 Data MCP98242 FIGURE 5-8: Timing Diagram for Changing TA Resolution to 0.0625C <0000 0011>b (See Section 4.0 "Serial Communication"). DS21996A-page 24 (c) 2006 Microchip Technology Inc. MCP98242 5.2 5.2.1 SENSOR FEATURE DESCRIPTION SHUTDOWN MODE Shutdown mode disables all power-consuming activities (including temperature sampling operations) while leaving the serial interface active. This mode is selected by setting bit 8 of CONFIG to `1'. In this mode, the device consumes ISHDN. It remains in this mode until bit 8 is cleared `0' to enable Continuous Conversion mode, or until power is recycled. The Shutdown bit (bit 8) cannot be set to `1' while bits 6 and 7 of CONFIG (Lock bits) are set to `1'. However, it can be cleared `0' or returned to Continuous Conversion while locked. In Shutdown mode, all registers can be read or written. However, the serial bus activity increases the shutdown current. In addition, if the device is shutdown while the Event pin is asserted as active-low or deasserted active-low (see Section 5.2.3.1 "Comparator Mode"), the device will retain the active-low state. This increases the shutdown current due to the additional Event output pull-down current. The Event output can also be used as a critical temperature output using bit 2 of CONFIG (critical output only). When this feature is selected, the Event output becomes a comparator output. In this mode, the interrupt output configuration (bit 0 of CONFIG) is ignored. 5.2.3.1 Comparator Mode Comparator mode is selected using bit 0 of CONFIG. In this mode, the Event output is asserted as active-high or active-low using bit 1 of CONFIG. Figure 5-2 shows the conditions that toggle the Event output. If the device enters Shutdown mode with asserted Event output, the output remains asserted during Shutdown. The device must be operating in Continuous Conversion mode for tCONV; the TA vs. TUPPER, TLOWER and TCRIT boundary conditions need to be satisfied in order for the Event output to deassert. Comparator mode is useful for thermostat-type applications, such as turning on a cooling fan or triggering a system shutdown when the temperature exceeds a safe operating range. 5.2.2 TEMPERATURE HYSTERESIS (THYST) 5.2.3.2 Temperature Resolution A hysteresis of 0C, 1.5C, 3C or 6C can be selected for the TUPPER, TLOWER and TCRIT temperate boundaries using bits 10 and 9 of CONFIG. The hysteresis applies for decreasing temperature only (hot to cold), or as temperature drifts below the specified limit. The TUPPER, TLOWER and TCRIT boundary conditions are described graphically in Figure 5-2. 5.2.3 EVENT OUTPUT CONFIGURATION The Event output can be enabled using bit 3 of CONFIG (Event output control bit) and can be configured as either a comparator output or as Interrupt Output mode using bit 0 of CONFIG (Event mode). The polarity can also be specified as an active-high or active-low using bit 1 of CONFIG (Event polarity). When the ambient temperature increases above the critical temperature limit, the Event output is forced to a comparator output (regardless of bit 0 of CONFIG). When the temperature drifts below the critical temperature limit minus hysteresis, the Event output automatically returns to the state specified by bit 0 of CONFIG. The status of the Event output can be read using bit 4 of CONFIG (Event status). Bit 7 and 6 of the CONFIG register can be used to lock the TUPPER, TLOWER and TCRIT registers. The bits prevent false triggers at the Event output due to an accidental rewrite to these registers. The MCP98242 is capable of providing a temperature data with 0.5C to 0.0625C resolution. The Resolution can selected using the Resolution register (Register 5-8) which is located in address `00001000'b. This address location is not specified in JEDEC Standard JC42.4. However, it provides additional flexibility while being functionally compatible with JC42.4 and provide a 0.25C resolution at 125 ms (max.). The selected resolution can be read by user using bit 4 and bit 3 of the Capability register (Register 5-2). A 0.25C resolution is set as POR default by factory. TABLE 5-2: Resolution 0.5C TEMPERATURE CONVERSION TIME tCONV (ms) 30 65 130 260 Samples/sec (typ.) 33 15 8 4 0.25C (POR default) 0.125C 0.0625C (c) 2006 Microchip Technology Inc. DS21996A-page 25 MCP98242 TCRIT - THYST TCRIT TUPPER TA TLOWER TLOWER -THYST TLOWER -THYST TUPPER - THYST TUPPER - THYST Comparator Event Output (Active-Low) Interrupt S/w Int. Clear Critical Only Note: 1 2 13 4 35 * 6 4 2 TABLE 5-9: Note 1 2 3 4 5 6 * Event Output Boundary Conditions TA TLOWER TA < TLOWER - THYST TA > TUPPER TA TUPPER - THYST TA TCRIT Event Output Comparator H L L H L Interrupt L L L L L Critical H H H H L 15 0 0 0 0 1 TA Bits 14 0 0 1 0 0 13 0 1 0 0 0 TA < TCRIT - THYST L H H 0 1 0 When TA TCRIT and TA < TCRIT - THYST the Event output is Comparator mode and bits 0 of CONFIG (Event output mode) is ignored. FIGURE 5-9: Event Output Condition. DS21996A-page 26 (c) 2006 Microchip Technology Inc. MCP98242 5.3 5.3.1 EEPROM FEATURE DESCRIPTION BYTE WRITE To write a byte in the MCP98242 EEPROM, the master has to specify the memory location or address. Once the address byte is transmitted correctly followed by a word address, the word address is stored in the EEPROM address pointer. The following byte is data to be stored in the specified memory location. Figure 5-10 shows the timing diagram. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K A C K A C K SDA S 1 0 1 0 WC X X X X X X X X X X X X X X X X P Address Byte MCP98242 Word Address MCP98242 Data MCP98242 FIGURE 5-10: Timing Diagram for Byte Write (See Section 4.0 "Serial Communication"). (c) 2006 Microchip Technology Inc. DS21996A-page 27 MCP98242 5.3.2 PAGE WRITE The write Address Byte, word address and the first data byte are transmitted to the MCP98242 in the same way as in a byte write. Instead of generating a Stop condition, the master transmits up to 15 additional data bytes to the MCP98242, which are temporarily stored in the on-chip page buffer and will be written into the memory after the master has transmitted a Stop condition. Upon receipt of each word, the four lower order address pointer bits are internally incremented by one. The higher order four bits of the word address remain constant. If the master should transmit more than 16 bytes prior to generating the Stop condition, the address counter will roll over and the previously received data will be overwritten. As with the byte write operation, once the Stop condition is received, an internal write cycle will begin (Figure 5-11). Note: Page write operations are limited to writing bytes within a single physical page, regardless of the number of bytes actually being written. Physical page boundaries start at addresses that are integer multiples of the page buffer size (or `page size') and end at addresses that are integer multiples of [page size - 1]. If a Page Write command attempts to write across a physical page boundary, the result is that the data wraps around to the beginning of the current page (overwriting data previously stored there), instead of being written to the next page, as might be expected. It is therefore necessary for the application software to prevent page write operations that would attempt to cross a page boundary. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K A C K SDA S 1 0 1 0 WC X X X X X X X X Address Byte MCP98242 Word Address (n) MCP98242 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 X X X X X X X X A C K X X X X X X X X A C K X X X X X X A C K P Data at (n) MCP98242 Note: Data at (n+1) MCP98242 Data at (n+15) MCP98242 n is the initial address for a page. FIGURE 5-11: Timing Diagram for Page Write (See Section 4.0 "Serial Communication"). DS21996A-page 28 (c) 2006 Microchip Technology Inc. MCP98242 5.3.3 WRITE PROTECTION The MCP98242 has a Software Write-Protect (SWP) feature that allows the lower half array (addresses 00h - 7Fh) to be write-protected or permanently write-protected (PWP). The write protected area can be cleared by sending Clear Write Protect (CWP) command. However, once the PWP is executed the protected memory can not be cleared. The device will not respond to the CWP command. To access write protection, the device address code of the Address Byte is set to `0110' instead of `1010'. The `1010' Address code is used to access the memory area and the `0110' address code is used to access the write protection. Once the device is write protected it will not acknowledge certain commands. Table 5-3 shows the corresponding Address Bytes for the write protect feature. TABLE 5-3: EEPROM WRITE PROTECT DEVICE ADDRESSING Address Pins Operation A2 A1 A0 Address Code 0110 0110 0110 Address Byte Slave Address A2 0 0 X A1 0 1 X A0 1 1 X R/W 0 1 GND X VDD VHI_A0 X X 0 1 0 1 SWP CWP PWP (Note) Note: WRITE READ WRITE READ WRITE READ GND GND VHI_A0 The Address Pins are `X' or don't cares. However, the slave address bits need to match the address Pins. TABLE 5-4: Status Not Protected Protected with SWP DEVICE RESPONSE WHEN WRITING DATA OR ACCESSING SWP/CWP/PWP Command SWP/CWP/PWP Page/byte write SWP CWP PWP Page/byte write lower 128 bytes SWP/CWP/PWP Page/byte write lower 128 bytes ACK ACK ACK NoACK ACK ACK ACK NoACK ACK Address X Address X X X Address X Address ACK ACK ACK NoACK ACK ACK ACK NoACK ACK Data Byte X Data X X X Data X Data ACK ACK ACK NoACK ACK ACK NoACK NoACK NoACK Write Cycle Yes Yes No Yes Yes No No No Permanently Protected Note: X is defined as `don't care'. (c) 2006 Microchip Technology Inc. DS21996A-page 29 MCP98242 5.3.3.1 Software Write Protect (SWP) The SWP feature is invoked by writing to the write-protect register. This is done by sending an Address Byte similar to a normal Write command. Figure 5-14 shows the timing diagram. SWP can be cleared using the CWP command. See Section 5.3.3.2 "Clear Write Protect (CWP)" The Slave Address bits need to correspond to the address pin logic configuration. For SWP, a high voltage VHI_WP needs to be applied to the A0 pin and the corresponding slave address needs to be set to `1', as shown in Table 5-3. Both A2 and A1 pins are grounded and the corresponding slave address bits are set to `0'. The device response in this mode is shown in Table 5-4 and Table 5-5. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A C K A C K A C K SDA S 0 1 1 0 0 0 1W X X X X X X X X X X X X X X X X P Address Byte MCP98242 Note: Word Address MCP98242 Data MCP98242 Apply VHI_WP at A0 pin and connect GND to A1 and A2 pins to initiate SWP cycle. FIGURE 5-12: Timing Diagram for Setting Software Write Protect (See Section 4.0 "Serial Communication"). 5.3.3.2 Clear Write Protect (CWP) The Slave Address bits need to correspond to the address pin logic configuration. For CWP, a high voltage VHI_WP needs to be applied to the A0 pin and the corresponding slave address needs to be set to `1'. The A1 pin is set to VDD and the corresponding slave address bit is set to `1'. And A2 pins is set to ground and the corresponding slave address bits are set to `0'. Table 5-3 shows the bit configuration. The device response in this mode is shown in Table 5-4 and Table 5-5. The CWP feature is invoked by writing to the clear write-protect register. This is done by sending an Address Byte similar to a normal Write command. Figure 5-14 shows the timing diagram. CWP clears SWP only. PWP can not be cleared using this command. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A C K A C K A C K SDA S 0 1 1 0 0 1 1W X X X X X X X X X X X X X X X X P Address Byte MCP98242 Note: Word Address MCP98242 Data MCP98242 Apply VHI_WP at A0 pin, apply VDD at A1 pin, connect A2 pin to GND to initiate CWP cycle. FIGURE 5-13: Timing Diagram for Setting Clear Write Protect (See Section 4.0 "Serial Communication"). DS21996A-page 30 (c) 2006 Microchip Technology Inc. MCP98242 5.3.3.3 PWP (Permanent Write Protect) Once the PWP register is written, the lower half of the memory will be permanent protected and the device will not acknowledge any command. The protected area of the memory can not be cleared, reversed, or re-written. If a write is attempted to the protected area, the device will acknowledge the address byte and word address but not the data byte. (See Table 5-4 and Table 5-5). Note: Once the Permanent Write-Protect is executed, it cannot be reversed, even if the device power is cycled. Unlike SWP and CWP, a VHI_WP is not applied on the A0 pin to execute PWP. The state of A2, A1, and A0 is user selectable. However, the address pin states need to match the slave address bits, as shown in Table 5-3. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K A C K A C K SDA S 0 1 1 0 WC X X X X X X X X X X X X X X X X P Address Byte MCP98242 Note: Word Address MCP98242 Data MCP98242 Unlike SWP and CWP, a VHI_WP is not applied on the A0 pin to execute PWP. FIGURE 5-14: Timing Diagram for Setting Permanently Write Protect (See Section 4.0 "Serial Communication"). (c) 2006 Microchip Technology Inc. DS21996A-page 31 MCP98242 5.3.4 READ OPERATION Read operations are initiated in the same way as write operations, with the exception that the R/W bit of the slave address is set to `1'. There are three basic types of read operations: current address read, random read and sequential read. TABLE 5-5: Status DEVICE RESPONSE WHEN READING SWP/CWP/PWP Command SWP/CWP/PWP SWP CWP PWP SWP/CWP/PWP ACK ACK NoACK ACK ACK NoACK Address X X X X X ACK NoACK NoACK NoACK NoACK NoACK Data Byte X X X X X ACK NoACK NoACK NoACK NoACK NoACK Not Protected Protected with SWP Permanently Protected Note: X is defined as `don't care'. 5.3.4.1 Current Address Read The MCP98242 contains an address counter that maintains the address of the last word accessed, internally incremented by `1'. Therefore, if the previous access (either a read or write operation) was to address n, the next current address read operation would access data from address n+1. Upon receipt of the slave address with R/W bit set to `1', the MCP98242 issues an acknowledge and transmits the 8-bit data 1 2 3 4 5 6 7 8 word. The master will not acknowledge (NAK) the transfer but does generate a Stop condition and the MCP98242 discontinues transmission (Figure 5-15). 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K N A K SDA S 1 0 1 0 RC 0 0 0 0 0 0 0 0 P Address Byte Current Word Address MCP98242 Master Note: In this example, the current word address is the previously accessed address location n plus 1. FIGURE 5-15: Reading Current Word Address (See Section 4.0 "Serial Communication"). DS21996A-page 32 (c) 2006 Microchip Technology Inc. MCP98242 5.3.4.2 Random Read Random read operations allow the master to access any memory location in a random manner. To perform this type of read operation, the word address must first be set. This is done by sending the word address to the MCP98242 as part of a write operation. Once the word address is sent, the master generates a start condition following the acknowledge. This terminates the write operation, but not before the internal address pointer is set. The master then issues the Address Byte again, but with the R/W bit set to a `1'. The MCP98242 then issues an acknowledge and transmits the 8-bit data word. The master will not acknowledge the transfer but does generate a stop condition and the MCP98242 discontinues transmission (Figure 5-16). 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A A C K SDA S 1 0 1 0 WC K 0 0 0 0 0 0 0 0 Address Byte MCP98242 Word Address (n) MCP98242 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A K N A K SDA S 1 0 1 0 RC X X X X X X X X P Address Byte MCP98242 Data at (n) Master Note: In this example, `n' is the current Address Word which `00'h and the data is the byte at address `n'. FIGURE 5-16: Timing Diagram for Random Read (See Section 4.0 "Serial Communication"). (c) 2006 Microchip Technology Inc. DS21996A-page 33 MCP98242 5.3.4.3 Sequential Read Sequential reads are initiated in the same way as a random read, with the exception that after the MCP98242 transmits the first data byte, the master issues an acknowledge, as opposed to a stop condition in a random read. This directs the MCP98242 to transmit the next sequentially addressed 8-bit word (Figure 5-17). To provide sequential reads, the MCP98242 contains an internal address pointer, which is incremented by one at the completion of each operation. This address pointer allows the entire memory contents to be serially read during one operation. 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 SCLK A 2 A 1 A 0 A C K A C K SDA S 1 0 1 0 R X X X X X X X X Address Byte MCP98242 Data (n)1 MCP98242 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 X X X X X X X X A C K X X X X X X X X A C K X X X X X X N A K P Data at (n+1) MCP98242 Data at (n+2) MCP98242 Data at (n+m)(1) Master Note 1: `n' is the initial address location and `m' is the final address location (`n+m' < 256) FIGURE 5-17: 5.3.5 Timing Diagram for Sequential Read (See Section 4.0 "Serial Communication"). STANDBY MODE The design will incorporate a low power standby mode (ISHDN). Standby mode will be entered after a normal termination of any operation and after all internal functions are complete. This would include any error conditions occurring, such as improper number of clock cycles or improper instruction byte as defined previously. DS21996A-page 34 (c) 2006 Microchip Technology Inc. MCP98242 5.4 Summary of Temperature Sensor Power-on Default The MCP98242 temperature sensor has an internal Power-on Reset (POR) circuit. If the power supply voltage VDD glitches down to the VPOR threshold, the device resets the registers to the power-on default settings. Table 5-6 shows the power-on default summary. TABLE 5-6: TABLE 5-10: POWER-ON DEFAULTS Registers Default Register Data (Hexadecimal) Power-up Default Register Description 0.25 Measures temperature below 0C 1C accuracy over active range Temperature event output Comparator mode Active-Low output Event and critical output Output disabled Event not asserted Interrupt cleared Event limits unlocked Critical limit unlocked Continuous conversion 0C Hysteresis 0C 0C 0C 0C 0x0054 (hex) 0x2000 (hex) 0x01 (hex) Address (Hexadecimal) 0x00 Register Label Capability 0x000F 0x01 CONFIG 0x0000 0x02 0x03 0x04 0x05 0x06 0x07 0x08 TUPPER TLOWER TCRIT TA Manufacturer ID Device ID/ Device Revision Resolution 0x0000 0x0000 0x0000 0x0000 0x0054 0x2000 0x01 (c) 2006 Microchip Technology Inc. DS21996A-page 35 MCP98242 6.0 6.1 APPLICATIONS INFORMATION Connecting to the Serial Bus 6.2 Layout Considerations The SDA and SCLK serial interface pins are open-drain pins that require pull-up resistors. This configuration is shown in Figure 6-1. VDD Microcontroller MCP98242 SDA SCLK Event The MCP98242 does not require any additional components besides the master controller in order to measure temperature. However, it is recommended that a decoupling capacitor of 0.1 F to 1 F be used between the VDD and GND pins. A high-frequency ceramic capacitor is recommended. It is necessary for the capacitor to be located as close as possible to the power and ground pins of the device in order to provide effective noise protection. R R R 6.3 Thermal Considerations Master FIGURE 6-1: Interface. Slave Pull-up Resistors On Serial A potential for self-heating errors can exist if the MCP98242 SDA, SCLK and Event lines are heavily loaded with pull-ups (high current). Typically, the self-heating error is negligible because of the relatively small current consumption of the MCP98242. A temperature accuracy error of approximately 0.5C could result from self-heating if the communication pins sink/source the maximum current specified. For example, if the Event output is loaded to maximum IOL, Equation 6-1 can be used to determine the effect of self-heating. The number of devices connected to the bus is limited only by the maximum rise and fall times of the SDA and SCLK lines. Unlike I2C specifications, SMBus does not specify a maximum bus capacitance value. Rather, the SMBus specification requires that the maximum current through the pull-up resistor be 350 A and minimum 100 A. Because of this, the value of the pull-up resistors will vary depending on the system's bias voltage (VDD). The pull-up resistor values for a 3.3 V system ranges 9 k to 33 k. Minimizing bus capacitance is still very important as it directly affects the rise and fall times of the SDA and SCLK lines. Although SMBus specifications only require the SDA and SCLK lines to pull-down 350 A, with a maximum voltage drop of 0.4 V, the MCP98242 is designed to meet a maximum voltage drop of 0.4 V, with 3 mA of current. This allows lower pull-up resistor values to be used, allowing the MCP98242 to handle higher bus capacitance. In such applications, all devices on the bus must meet the same pull-down current requirements. A possible configuration using multiple devices on the SMBus is shown in Figure 6-2. SDA SCLK MCP98242 Temperature Sensor 24LCS52 EEPROM EQUATION 6-1: T = JA (V DD *I DD +V EFFECT OF SELF-HEATING OL_Event *I OL_Event +V OL_SDA *I OL_SDA ) Where: T = TJ - TA TJ = Junction Temperature TA = Ambient Temperature JA = Package Thermal Resistance VOL_Event, SDA = Event and SDA Output VOL (0.4 Vmax) IOL_Event, SDA = Event and SDA Output IOL (3 mAmax) At room temperature (TA = +25C) with maximum IDD = 500 A and VDD = 3.6V, the self-heating due to power dissipation T is 0.2C for the DFN-8 package and 0.5C for the TSSOP-8 package. FIGURE 6-2: SMBus. Multiple Devices on DIMM DS21996A-page 36 (c) 2006 Microchip Technology Inc. MCP98242 7.0 7.1 PACKAGING INFORMATION Package Marking Information 8-Lead DFN (MC) Example: XXX YWW NN ABJ 619 56 8-Lead TSSOP (ST) XXXX YYWW NNN Example: 242B 0619 256 Legend: XX...X Y YY WW NNN e3 * Note: Customer-specific information Year code (last digit of calendar year) Year code (last 2 digits of calendar year) Week code (week of January 1 is week `01') Alphanumeric traceability code Pb-free JEDEC designator for Matte Tin (Sn) This package is Pb-free. The Pb-free JEDEC designator ( e3 ) can be found on the outer packaging for this package. In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. (c) 2006 Microchip Technology Inc. DS21996A-page 37 MCP98242 8-Lead Plastic Dual Flat No-Lead Package (MC) 2x3x0.9 mm Body (DFN) - Saw Singulated Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging b p n L D K E E2 EXPOSED METAL PAD (NOTE 2) PIN 1 ID INDEX AREA (NOTE 1) ALTERNATE CONTACT CONFIGURATION DETAIL D2 2 1 TOP VIEW BOTTOM VIEW A1 A3 A EXPOSED TIE BAR (NOTE 3) Units Dimension Limits Number of Pins Pitch Overall Height Standoff Contact Thickness Overall Length Overall Width Exposed Pad Length Exposed Pad Width Contact Length Contact-to-Exposed Pad Contact Width n e A A1 A3 D E D2 E2 L K b .051 .059 .012 .008 .008 .031 .000 MIN INCHES NOM 8 .020 BSC .035 .001 .008 REF. .079 BSC .118 BSC - - .016 - .010 .069 .075 .020 - .012 1.30** 1.50** 0.30 0.20 0.20 .039 .002 0.80 0.00 MAX MIN MILLIMETERS* NOM 8 0.50 BSC 0.90 0.02 0.20 REF. 2.00 BSC 3.00 BSC - - 0.40 - 0.25 1.75 1.90 0.50 - 0.30 1.00 0.05 MAX * Controlling Parameter ** Not within JEDEC parameters Significant Characteristic Notes: 1. Pin 1 visual index feature may vary, but must be located within the hatched area. 2. Exposed pad may vary according to die attach paddle size. 3. Package may have one or more exposed tie bars at ends. BSC: Basic Dimension. Theoretically exact value shown without tolerances. See ASME Y14.5M REF: Reference Dimension, usually without tolerance, for information purposes only. See ASME Y14.5M JEDEC Equivalent MO-229 VCED-2 DWG No. C04-123 Revised 09-12-05 DS21996A-page 38 (c) 2006 Microchip Technology Inc. MCP98242 8-Lead Plastic Thin Shrink Small Outline (ST) - 4.4 mm Body (TSSOP) Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging E E1 p D 2 1 n B A c L A1 A2 Units Dimension Limits Number of Pins Pitch Overall Height Molded Package Thickness Standoff Overall Width Molded Package Width Molded Package Length Foot Length Foot Angle Lead Thickness Lead Width Mold Draft Angle Top Mold Draft Angle Bottom n p A A2 A1 E E1 D L c B .039 .033 .002 .246 .169 .114 .020 0 .004 .007 0 0 MIN INCHES NOM 8 .026 .041 .035 .004 .251 .173 .118 .024 4 .006 .010 5 5 .043 .037 .006 .256 .177 .122 .028 8 .008 .012 10 10 1.00 0.85 0.05 6.25 4.30 2.90 0.50 MAX MIN MILLIMETERS* NOM 8 0.65 1.05 0.90 0.10 6.38 4.40 3.00 0.60 4 0.15 0.25 5 5 1.10 0.95 0.15 6.50 4.50 3.10 0.70 8 0.20 0.30 10 10 MAX 0 0.09 0.19 0 0 * Controlling Parameter Notes: Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .005" (0.127mm) per side. JEDEC Equivalent: MO-153 Drawing No. C04-086 Revised 07-21-05 (c) 2006 Microchip Technology Inc. DS21996A-page 39 MCP98242 NOTES: DS21996A-page 40 (c) 2006 Microchip Technology Inc. MCP98242 APPENDIX A: REVISION HISTORY Revision A (September 2006) * Original Release of this Document. (c) 2006 Microchip Technology Inc. DS21996A-page 41 MCP98242 NOTES: DS21996A-page 42 (c) 2006 Microchip Technology Inc. MCP98242 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. Device -X Grade X Temperature Range /XX Package Examples: a) b) MCP98242-BE/MC: Extended Temp., 8LD DFN pkg. MCP98242T-BE/MC: Tape and Reel, Extended Temp., 8LD DFN pkg. MCP98242-BE/ST: Extended Temp., 8LD TSSOP pkg. MCP98242T-BE/ST: Tape and Reel, Extended Temp., 8LD TSSOP pkg. Device: MCP98242: Digital Temperature Sensor MCP98242T: Digital Temperature Sensor (Tape and Reel) B B B E = 1C (max.) from +75C to +95C, 2C (max.) from +40C to +125C, and 3C (max.) from -20C to +125C = -40C to +125C c) d) Grade: Temperature Range: Package: MC = Dual Flat No Lead (2x3 mm Body), 8-lead ST = Plastic Thin Shrink Small Outline (4x4 mm Body), 8-lead (c) 2006 Microchip Technology Inc. DS21996A-page 43 MCP98242 NOTES: DS21996A-page 44 (c) 2006 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: * * * Microchip products meet the specification contained in their particular Microchip Data Sheet. Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. Microchip is willing to work with the customer who is concerned about the integrity of their code. Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as "unbreakable." * * Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip's code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART, PRO MATE, PowerSmart, rfPIC, and SmartShunt are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB, SEEVAL, SmartSensor and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Analog-for-the-Digital Age, Application Maestro, CodeGuard, dsPICDEM, dsPICDEM.net, dsPICworks, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active Thermistor, Mindi, MiWi, MPASM, MPLIB, MPLINK, PICkit, PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal, PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance, UNI/O, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. (c) 2006, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received ISO/TS-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona, Gresham, Oregon and Mountain View, California. The Company's quality system processes and procedures are for its PICmicro(R) 8-bit MCUs, KEELOQ(R) code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001:2000 certified. (c) 2006 Microchip Technology Inc. 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