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MAX1617 SMBus Temperature Sensor with Internal and External Diode Input
The MAX1617 is a serially programmable temperature sensor optimized for monitoring modern high performance CPUs with on-board, integrated temperature sensing diodes. Temperature data is converted from the CPU's diode outputs and made available as an 8-bit digital word. Communication with the MAX1617 is accomplished via the standard System Management Bus (SMBus) commonly used in modern computer systems. This permits reading the current internal/external temperature, programming the threshold setpoints, and configuring the device. Additionally, an interrupt is generated on the ALERT pin when temperature moves outside the preset threshold windows in either direction. A Standby command may be sent via the SMBus by signaling the STBY input to activate the low-power Standby mode. Registers can be accessed while in Standby mode. Address selection inputs allow up to nine MAX1617s to share the same 2-wire SMBus for multi-zone monitoring. All registers can be read by the host, and both polled and interrupt driven systems are easily accommodated. Small size, low installed cost, and ease of use make the MAX1617 an ideal choice for implementing sophisticated system management schemes, such as ACPI. Features Includes Internal and External Sensing Capability Outputs Temperature As 8-Bit Digital Word Solid State Temperature Sensing; 1C Resolution 3.0 -- 5.5V Operating Range Independent Internal and External Threshold Set-Points With ALERT Interrupt Output * SMBus 2-Wire Serial Interface * Up To 9 MAX1617s May Share the Same Bus * Low Standby Power Mode * Low Power: 70 A (max) Operating, 10 A (max) Standby Mode * 16-Pin Plastic QSOP Package * Operating Temperature Range: -55C to +125C
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16-Pin QSOP DB SUFFIX CASE TBD PRELIMINARY INFORMATION
PIN CONFIGURATION (Top View)
NC 1 VDD 2 D+ 3
16 NC 15 STBY 14 SCL
D- 4 13 NC NC 5 MAX1617 12 SDA ADD1 6 GND 7 GND 8
11 ALERT 10 ADD0 9 NC
* * * * *
ORDERING INFORMATION
Device MAX1617DBR2 Package 16-Pin QSOP Shipping 2500 Tape/Reel
* Thermal Protection For Intel "Deschutes" Pentium IITM and Other * *
High Performance CPUs with Integrated On-Board Diode - No Sensor Mounting Problems! Accurate Temperature Sensing From Any Silicon Junction Diode Thermal Management in Electronic Systems: Computers, Network Equipment, Power Supplies
Typical Applications
(c) Semiconductor Components Industries, LLC, 1999
1
February, 2000 - Rev. 0
Publication Order Number: MAX1617/D
MAX1617
FUNCTIONAL BLOCK DIAGRAM
Internal Sensor (Diode) D+ D-
DS
Modulator Register Set Int. Temp Ext.Temp Status Byte Config. Byte Conv. Rate Ext. Hi Limit Ext. Lo Limit Int. Hi Limit Int. Lo Limit
Control Logic
ALERT STBY
SCL SDA SMBus Interface ADD 0 ADD 1
ABSOLUTE MAXIMUM RATINGS*
Symbol VDD Power Supply Voltage Voltage on Any Pin TA Tstg Operating Temperature Range Storage Temperature Range SMBus Input/Output Current D- Input Current PD Maximum Power Dissipation Parameter Value 6.0 (GND - 0.3 V) to (VDD + 0.3 V) -55 to +125 -65 to +150 -1 to +50 1 330 Unit V V C C mA mA mW
* Maximum Ratings are those values beyond which damage to the device may occur.
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2
MAX1617
PIN DESCRIPTION
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2 3 4 VDD D+ D- Power Power Supply Input Bi-Directional Bi-Directional Input Current Source and A/D Positive Input Current Sink and A/D Negative Input 6, 10 7, 8 11 ADD[1:0] GND Address Select Pins (See Address Decode Table) System Ground Power ALERT SDA SCL Output SMBus Interrupt (SMBALERT) or Comparator Output SMBus Serial Data 12 14 15 Bi-Directional Input Input -- SMBus Serial Clock Standby Enable Not Connected STBY NC 1, 5, 9, 13, 16
Pin No.
Symbol
Type
Description
PIN DESCRIPTION (NOTE: A pull-up resistor is necessary on ALERT since it is an open-drain output. Current sourced from the pull-up Input. SMBus serial clock. Clocks data into and out of the resistor causes power dissipation and may cause internal MAX1617. heating of the MAX1617. To avoid affecting the accuracy of SDA internal temperature readings, the pull-up resistors should Bi-directional. Serial data is transferred on the SMBus in be made as large as possible.) both directions using this pin.
SCL STBY ADD1, ADD0
Inputs. Sets the 7-bit SMBus address. These pins are "tri-state," and the SMBus addresses are specified in the Address Decode Table below. (NOTE: The tri-state scheme allows up to nine MAX1617s on a single bus. A match between the MAX1617's address and the address specified in the serial bit stream must be made to initiate communication. Many SMBus-compatible devices with other addresses may share the same 2-wire bus. These pins are only active at power-on reset, and will latch into the appropriate states.
ALERT
Input. The activation of Standby mode may be achieved using either the STBY pin or the CHIP STOP bit (CONFIG register). If STBY is pulled low, the MAX1617 unconditionally enters its low-power Standby mode. The temperature-to-digital conversion process is halted, but ALERT remains functional. The MAX1617's bus interface remains active, and all registers may be read from and written to normally. The INT_TEMP and EXT_TEMP registers will contain whatever data was valid at the time of Standby. (Transitions on SDA or SCL due to external bus activity may increase the Standby power consumption.)
D+
Output, Open Collector, Active Low. The ALERT output corresponds to the general SMBALERT signal and indicates an interrupt event. The MAX1617 will respond to the standard SMBus Alert Response Address when ALERT is asserted. Normally, the ALERT output will be asserted when any of the following occurs: INT_TEMP equal to or exceeds INT_HLIM INT_TEMP falls below INT_LLIM EXT_TEMP equal to or exceeds EXT_HLIM EXT_TEMP falls below EXT_LLIM External Diode "Open" The operation of the ALERT output is controlled by the MASK1 bit in the CONFIG register. If the MASK1 bit is set to "1," no interrupts will be generated on ALERT. The ALERT output is cleared and re-armed by the Alert Response Address (ARA). This output may be WIRE-ORed with similar outputs from other SMBus devices. If the alarm condition persists after the ARA, the ALERT output will be immediately re-asserted.
Bi-directional. this pin connects to the anode of the external diode and is the positive A/D input. Current is injected into the external diode from the MAX1617, and the temperature proportional VBE is measured and converted to digital temperature data.
D--
Bi-directional. This pin connects to the cathode of the external diode. Current is sunk from the external diode into the MAX1617 through this pin. It also is the negative input terminal to the MAX1617's A/D converter. This node is kept at approximately 0.7V above GROUND.
VDD
Input. Power supply input. See electrical specifications.
GND
Input. Ground return for all MAX1617 functions.
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MAX1617
DC ELECTRICAL CHARACTERISTICS (VDD = 3.3 V, -55C TA 125C, unless otherwise noted.) Symbol Power Supply VDD VUV-LOCK VPOR IDD IDD IDD-STANDBY IDD-STANDBY IADD-BIAS ALERT Output VOL ADD[1:0] Inputs VIL VIH STBY Input VIL VIH TRES TIERR Logic Input Low Logic Input High -- VDD x 0.7 -- -2 -3 -- -3 -5 -- -- -- -- 54 -35 -- -- VDD x 0.3 -- V V C C -- -- 3 -- -- 5 100 10 0.7 83 -- +2 +3 -- C +3 +5 -- -- -- -- 112 +35 Logic Input Low Logic Input High -- VDD x 0.7 -- -- VDD x 0.3 -- V V Output Low Voltage (IOL = 1.0 mA) (3) -- -- 0.4 V Power Supply Voltage VDD Undervoltage Lockout Threshold Power-On Reset Threshold (VDD Falling Edge) Operating Current 0.25 Conv./Sec Rate SMBus Inactive (1) Operating Current 2 Conv./Sec Rate SMBus Inactive (1) Standby Supply Current (SMBus Active) Standby Supply Current (SMBus Inactive) ADD[1:0] Bias Current (Power-Up Only) 3.0 2.4 1.0 -- -- -- -- -- -- 2.80 1.7 -- -- -- -- 160 5.5 2.95 2.3 70 180 100 10 -- V V V Characteristic Min Typ Max Unit
mA mA mA mA mA
Temp-to-Bits Converter Basic Temperature Resolution Internal Diode Temperature +60C TA +100C 0C TA +125C -55C TA 0C External Diode Temperature +60C TA +100C 0C TA +125C -55C TA 0C External Diode High Source Current (D+) - (D-) ~ 0.65 V External Diode Low Source Current (D+) - (D-) ~ 0.65 V Source Voltage Conversion Time From CHIP STOP to Conv. Complete (2) Conversion Rate Accuracy (See Conversion Rate Register Desc.) 1.0 --
TEERR
IDIODE-HIGH IDIODE-LOW VD-SOURCE tCONV
mA mA
V msec %
DCR
2-Wire SMBus Interface VIH VIL VOL Logic Input High Logic Input Low SDA Output Low IOL = 2 mA (3) IOL = 4 mA (3) Input Capacitance SDA, SCL 2.2 -- -- -- -- -- -- -- -- 5.0 -- 0.8 0.4 0.6 -- pF V V V
ILEAK I/O Leakage -1.0 0.1 1.0 mA 1. Operating current is an average value (including external diode injection pulse current) integrated over multiple conversion cycles. Transient current may exceed this specification. 2. For true recurring conversion time see Conversion Rate register description. 3. Output current should be minimized for best temperature accuracy. Power dissipation within the MAX1617 will cause self-heating and temperature drift error.
CIN
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4
MAX1617
SMBus PORT AC TIMING (VDD = 3.3 V, -55C (TA = TJ) 125C; CL = 80 pF, unless otherwise noted.) Symbol fSMB tLOW tHIGH tR tF tSU(START) tH(START) tSU-DATA tH-DATA tSU(STOP) tIDLE Characteristic SMBus Clock Frequency Low Clock Period (10% to 10%) High Clock Period (90% to 90%) SMBus Rise Time (10% to 90%) SMBus Fall Time (90% to 10%) Start Condition Setup Time (90% SCL to 10% SDA) (for Repeated Start Condition) Start Condition Hold Time Data in Setup Time Data in Hold Time Stop Condition Setup Time Bus Free Time Prior to New Transition Min 10 4.7 4 -- -- 4 4 1,000 1,250 4 4.7 Typ -- -- -- -- -- -- -- -- -- -- -- Max 100 -- -- 1,000 300 -- -- -- -- -- -- Unit kHz
msec msec
nsec nsec
msec msec
nsec nsec
msec msec
SMBUS Write Timing Diagram
A
ILOW
B
IHIGH
C
D
EF
G
H
I
J
K
L
M
SCL
SDA
t SU(START) t H(START) t SU-DATA t H-DATA t SU(STOP) t IDLE
A = Start Condition B = MSB of Address Clocked into Slave C = LSB of Address Clocked into Slave D = R/W Bit Clocked into Slave E = Slave Pulls SDA Line Low
F = Acknowledge Bit Clocked into Master G = MSB of Data Clocked into Slave H = LSB of Data Clocked into Slave I = Slave Pulls SDA Line Low
J = Acknowledge Clocked into Master K = Acknowledge Clock Pulse L = Stop Condition, Data Executed by Slave M= New Start Condition
SMBUS Read Timing Diagram
A
ILOW
B
IHIGH
C
D
EF
G
H
I
J
K
SCL
SDA
t SU(START) t H(START) t SU-DATA t SU(STOP) t IDLE
A = Start Condition B = MSB of Address Clocked into Slave C = LSB of Address Clocked into Slave D = R/W Bit Clocked into Slave
E = Slave Pulls SDA Line Low F = Acknowledge Bit Clocked into Master G = MSB of Data Clocked into Master H = LSB of Data Clocked into Master
I = Acknowledge Clock Pulse J = Stop Condition K = New Start Condition
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MAX1617
DETAILED OPERATING DESCRIPTION The MAX1617 acquires and converts temperature information from two separate sources, both silicon junction diodes, with a basic accuracy of 1C. One is located on the MAX1617 die; the other is connected externally. The external diode may be located on another IC die. The analog-to-digital converter on the MAX1617 alternately converts temperature data from the two sensors and stores them separately in internal registers. The system interface is a slave SMBus port with an ALERT (SMBALERT) interrupt output. The interrupt is triggered when one or more of four preset temperature thresholds are tripped (see Figure 1). These four thresholds are user-programmable via the SMBus port. Additionally, the temperature data can be read at any time through the SMBus port. Nine SMBus addresses are programmable for the MAX1617, which allows for a multi-sensor configuration. Also, there is low-power Standby mode where temperature acquisition is suspended. STANDBY MODE The MAX1617 allows the host to put it into a low power (IDD = 10 A, max) Standby mode. In this mode, the A/D converter is halted, and the temperature data registers are frozen. The SMBus port operates normally. Standby mode can be enabled with either the STBY input pin or the CHIP STOP bit in the CONFIG register. The following table summarizes this operation.
Standby Mode Operation STBY 0 1 1 1 Chip Stop Bit Don't Care 0 1 1 One Shot? Don't Care Don't Care No Yes Operating Mode Standby Normal Standby Normal (1 Conversion Only, then Standby)
EXT_TEMP INT_TEMP
TEMPERATURE
ASSERT ALERT
EXT_HLIM
SETPOINTS
ASSERT ALERT INT_HLIM ASSERT ALERT ASSERT ALERT
EXT_LLIM INT_LLIM
TIME
ALERT
Note: This diagram implies that the appropriate setpoint is moved, temporarily, after each ALERT event to suppress re-assertion of ALERT immediately after the ARA/de-assertion.
Figure 1. Temperature vs. Setpoint Event Generation
SMBus SLAVE ADDRESS The two pins ADD1 and ADD0 are tri-state input pins which determine the 7-bit SMBus slave address of the MAX1617. The address is latched during POR.
Address Decode Table ADD0 0 0 0 open (3-state) open (3-state) open (3-state) 1 1 1 ADD1 0 open (3-state) 1 0 open (3-state) 1 0 open (3-state) 1 SMBus Address 0011 000 0011 001 0011 010 0101 001 0101 010 0101 011 1001 100 1001 101 1001 110
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MAX1617
POR*, initialize all registers Monitor SMBus for START condition Stop conv., reset STATUS D[7] YES One shot? YES YES STBY active? NO NO EOC*? YES NO NO READ Perform one conversion cycle Update INT_TEMP NO NO Address match? YES Read/ Write? YES NO Valid command? NO ARA*? YES STBY active? NO YES YES ALERT active ? YES ARA* bus arbitration? WRITE STBY released?
STBY mode active? NO Start internal conversion STATUS [D7]
YES
YES STATUS read? NO
Execute Status read and clear STATUS Execute SMBus read Execute SMBus write
Start external conversion
Thermal Trip? YES
Ext. diode open? NO YES Rest period over? NO YES One Shot? NO Rest Period according to CONV_RATE register Thermal Trip? NO Reset STATUS bit D[7] NO
NO EOC*? YES Update EXT_TEMP NO YES CONFIG [D7] active? YES
Win arbitration? YES
Disable and re-arm ALERT, send local address to host
Set appropriate STATUS bit D[6:2]
Enable ALERT#
* POR = Power On Reset; ARA = Alert Response Address; EOC = End Of Conversion
Figure 2. MAX1617 Functional Description Flowchart
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7
MAX1617
Serial Port Operation Start Condition (START)
The Serial Clock input (SCL) and bi-directional data port (SDA) form a 2-wire bi-directional serial port for programming and interrogating the MAX1617. The following conventions are used in this bus architecture. (See SMBus Write/Read Timing Diagram.) All transfers take place under control of a host, usually a CPU or microcontroller, acting as the Master, which provides the clock signal for all transfers. The MAX1617 always operates as a slave. The serial protocol is illustrated in Figure 3. All data transfers have two phases; all bytes are transferred MSB first. Accesses are initiated by a start condition (START), followed by a device address byte and one or more data bytes. The device address byte includes a Read/Write selection bit. Each access must be terminated by a Stop Condition (STOP). A convention called Acknowledge (ACK) confirms receipt of each byte. Note that SDA can change only during periods when SCL is LOW (SDA changes while SCL is High are reserved for Start and Stop conditions.)
MAX1617 Serial Bus Conventions Term Explanation Transmitter The device sending data to the bus. Receiver Master The device receiving data from the bus. The device which controls the bus: initiating transfers (START), generating the clock, and terminating transfers (STOP). The device addressed by the master. A unique condition signaling the beginning of a transfer indicated by SDA falling (High -- Low) while SCL is high. A unique condition signaling the end of a transfer indicated by SDA rising (Low -- High) while SCL is high. A receiver acknowledges the receipt of each byte with this unique condition. The receiver drives SDA low during SCL high of the ACK clock-pulse. The Master provides the clock pulse for the ACK cycle. Communication is not possible because the bus is in use. When the bus is idle, both SDA and SCL will remain high. The state of SDA must remain stable during the High period of SCL in order for a data bit to be considered valid. SDA only changes state while SCL is low during normal data transfers (see Start and Stop conditions).
The MAX1617 continuously monitors the SDA and SCL lines for a start condition (a High to Low transition of SDA while SCL is High), and will not respond until this condition is met. (See SMBus Write/Read Timing Diagram.)
Address Byte
Immediately following the Start Condition, the host must transmit the address byte to the MAX1617. The states of ADD1 and ADD0 during power-up determine the 7-bit SMBus address for the MAX1617. The 7-bit address transmitted in the serial bit stream must match for the MAX1617 to respond with an Acknowledge (indicating the MAX1617 is on the bus and ready to accept data). The eighth bit in the Address Byte is a Read-Write Bit. This bit is 1 for a read operation or 0 for a write operation.
Acknowledge (ACK)
Acknowledge (ACK) provides a positive handshake between the host and the MAX1617. The host releases SDA after transmitting eight bits, then generates a ninth clock cycle to allow the MAX1617 to pull the SDA line Low to acknowledge that it successfully received the previous eight bits of data or address.
Data Byte
Slave Start
After a successful ACK of the address byte, the host must transmit the data byte to be written or clock out the data to be read. (See the appropriate timing diagrams.) ACK will be generated after a successful write of a data byte into the MAX1617.
Stop Condition (STOP)
Stop
ACK
Communications must be terminated by a stop condition (a Low to High transition of SDA while SCL is High). The Stop Condition must be communicated by the transmitter to the MAX1617. (See SMBus Write/Read Timing Diagram.)
Busy NOT Busy Data Valid
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MAX1617
Write Byte Format S ADDRESS 7 Bits Slave Address Read Byte Format S ADDRESS 7 Bits Slave Address WR ACK COMMAND 8 Bits WR ACK COMMAND 8 Bits ACK DATA 8 Bits ACK P
Command Byte: selects which register you writing to. ACK S ADDRESS RD 7 Bits
Data Byte: data goes into the register set by the command byte. ACK DATA 8 Bits NACK P
Command Byte: selects which register you reading from.
Slave Address: repeated due to change in data- flow direction. Receive Byte Format
Data Byte: reads from the register set by the command byte.
Send Byte Format S ADDRESS 7 Bits WR ACK COMMAND 8 Bits ACK P
S
ADDRESS RD 7 Bits
ACK
DATA 8 Bits
NACK
P
S = Start Condition P = Stop Condition Shaded = Slave Transmission
Command Byte: sends command with no data, usually used for one-shot command.
Data Byte: reads data from the register commanded by the last Read Byte.
Figure 3. SMBus Protocols
REGISTER SET AND PROGRAMMER'S MODEL
MAX1617 Command Set
The MAX1617 supports four SMBus command protocols. These are READ_BYTE, WRITE_BYTE, SEND_BYTE, and RECEIVE_BYTE. See System Management Bus Specification Rev. 1.0 for details.
Command Byte Description
Command RIT RET RS RC RCR RIHL RILL REHL RELL WC WCR WIHL WILL WEHL WELL OSHT RMID RMREV Code 00h 01h 02h 03h 04h 05h 06h 07h 08h 09h 0Ah 0Bh 0Ch 0Dh 0Eh 0Fh FEh FFh Function Read Internal Temp (INT_TEMP) Read External Temp (EXT_TEMP) Read Status Byte (STATUS) Read Configuration Byte (CONFIG) Read Conversion Rate Byte (CONV_RATE) Read Internal High Limit (INT_HLIM) Read Internal Low Limit (INT_LLIM) Read External High Limit (EXT_HLIM) Read External Low Limit (EXT_LLIM) Write Configuration Byte (CONFIG) Write Conversion Rate Byt3 (CONV_RATE) Write Internal High Limit (INT_HLIM) Write Internal Low Limit (INT_LLIM) Write External High Limit (EXT_HLIM) Write External Low Limit (EXT_LLIM) One Shot Temp Measurement Read Manufacturer ID (MFR_ID) Read Manufacturer Revision Number (MFR_REV)
NOTE: Proper device operation is NOT guaranteed if undefined locations (10h to FDh) are addressed. In case of erroneous SMBus operation (RECEIVE_BYTE command issued immediately after WRITE_BYTE command) the MAX1617 will ACKnowledge the address and return 1111 1111b to signify an error. Under no condition will it implement an SMBus "timeout."
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MAX1617
Configuration Register (Config), 8-Bits, Read/Write
Configuration Register (Config)
D[7] Mask1 Bit D[7] D[6] Chip Stop D[5] D[4] D[3] D[2] D[1] D[0] Reserved Function Interrupt Mask (see text) Standby switch Reserved -- Always returns zero when read. Operation 1 = mask ALERT 0 = don't mask ALERT 1 = standby, 0 = normal N/A
The value is in 2's-complement binary format such that a reading of 00000000b corresponds to 0C. Examples of this temperature-to-binary value relationship are shown in the following table.
Temperature-to-Digital Value Conversion (INT_TEMP, EXT_TEMP, INT_HLIM, INT_LLIM,EXT_HLIM, EXT_LLIM)
Actual Temperature +130.00C +127.00C +126.50C +25.25C +0.50C +0.25C 0.00C --0.25C --0.50C --0.75C --1.00C --25.00C --25.25C --54.75C Rounded Temperature +127C +127C +127C +25C +1C 0C 0C 0C 0C --1C --1C --25C --25C --55C --55C --65C Binary Value 01111111 01111111 01111111 00011001 00000001 00000000 00000000 00000000 00000000 11111111 11111111 11100111 11100110 11001001 11001001 10111111 Hex Value 7F 7F 7F 19 01 00 00 00 00 FF FF E7 E7 C9 C9 BF
POR State 0
D[6] D[5]--D[0]
0 0
A/D Conversion Rate Register (CONV_RATE), 8-Bits, Read/Write
A/D Conversion Rate Register (CONV_RATE)
D[7] D[6] D[5] Reserved Bit D[7:3] POR State 0 Function Reserved -- Always returns zero when read. Conversion rate bits. D[4] D[3] D[2] MSB D[1] X D[0] LSB
Operation N/A
D[2:0]
010b
See below.
--55.00C --65.00C
A/D Conversion Rate Selection
D2 0 0 0 0 1 1 1 1 D1 0 0 1 1 0 0 1 1 D0 0 1 0 1 0 1 0 1 Conversion Rate Samples/sec 0.0625 0.125 0.25 0.5 1.0 2.0 4.0 8.0
Temperature Threshold Setpoint Registers, 8-Bits, Read-Write (INT_HLIM, INT_LLIM, EXT_HLIM, EXT_LLIM) These registers store the values of the upper and lower temperature setpoints for event detection. The value is in 2's-complement binary. INT_HLIM and INT_LLIM are compared with the INT_TEMP value, and EXT_HLIM and EXT_LLIM are compared with EXT_TEMP. These registers may be written at any time.
Internal High Limit Setpoint Register (INT_HLIM)
D[7] MSB D[6] x D[5] x D[4] x D[3] x D[2] x D[1] x D[0] LSB
NOTE: Conversion rate denotes actual sampling of both internal and external sensors.
Temperature Registers, 8-Bits, Read-Only (INT_TEMP, EXT_TEMP) The binary value (2's complement format) in these two registers represents temperature of the internal and external sensors following a conversion cycle. The registers are automatically updated in an alternating manner.
Internal Temperature Register (INT_TEMP)
D[7] MSB D[6] x D[5] x D[4] x D[3] x D[2] x D[1] x D[0] LSB
Internal Low Limit Setpoint Register (INT_LLIM)
D[7] MSB D[6] x D[5] x D[4] x D[3] x D[2] x D[1] x D[0] LS
External High Limit Setpoint Register (EXT_HLIM)
D[7] MSB D[6] x D[5] x D[4] x D[3] x D[2] x D[1] x D[0] LSB
External Low Limit Setpoint Register (EXT_LLIM)
D[7] MSB D[6] x D[5] x D[4] x D[3] x 01111111b 11001001b 01111111b 11001001b D[2] x D[1] x +127C --55C +127C --55C D[0] LSB
External Temperature Register (EXT_TEMP)
D[7] MSB D[6] x D[5] x D[4] x D[3] x D[2] x D[1] x D[0] LSB
In the two temperature data and four threshold setpoint registers, each unit value represents one degree (Celsius).
NOTE: POR states: INT_HLIM INT_LLIM EXT_HLIM EXT_LLIM
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MAX1617
Status Register (Status)
D[7] Busy D[6] Flag1 D[5] Flag2 D[4] Flag3 D[3] Flag4 D[2] Flag5 D[1] Flag6 D[0] Reserved
Manufacturer's Identification Register (MFR_ID), 8-Bits, Read Only:
Manufacturer's Identification Register (MFR_ID)
D[7] MSB D[6] X D[5] X D[4] X D[3] X D[2] X D[1] X D[0] LSB
Bit(s) D[7] D[6] D[5] D[4] D[3] D[2] D[1:0]
POR State 0 0 0 0 0 0 0
Function Signal A/D converter is busy. Interrupt flag for INT_HLIM event Interrupt flag for INT_LLIM event Interrupt flag for EXT_HLIM event Interrupt flag for EXT_LLIM event External diode "fault" flag Reserved -- Always returns zero.
Operation* 1 = A/D busy, 0 = A/D idle 1 = interrupt occurred, 0 = none 1 = interrupt occurred, 0 = none 1 = interrupt occurred, 0 = none 1 = interrupt occurred, 0 = none 1 = external diode fault 0 = external diode OK N/A
Manufacturer's Revision Register (MFR_REV), 8-Bits, Read Only:
Manufacturer's Revision Register (MFR_REV)
D[7] MSB D[6] X D[5] X D[4] X D[3] X D[2] X D[1] X D[0] LSB
NOTE: All status bits are cleared after a read operation is performed on STATUS. The EXT_TEMP register will read +127C if an external diode "open" is detected.
Register Set Summary: The MAX1617's register set is summarized in the following table. All registers are 8-bits wide.
Name INT_TEMP EXT_TEMP STATUS CONFIG CONV_RATE INT_HLIM INT_LLIM EXT_HLIM EXT_LLIM MFR_ID MFR_REV CRITICAL Description Internal sensor temperature (2's complement) External sensor temperature (2's complement) STATUS register CONFIG register A/D conversion rate register Internal high limit (2's complement) Internal low limit (2's complement) External high limit (2's complement) External low limit (2's complement) ASCII for letter "T" Serial device revision # CRITICAL limit (2's complement) POR State 0000 0000b* 0000 0000b* 0000 0000b 0000 0000b 0000 0010b 0111 1111b 1100 1001b 0111 1111b 1100 1001b 0101 0100b ** N/A Read *** Write
*NOTE: The INT_TEMP and EXT_TEMP register immediately will be updated by the A/D converter after POR. If STBY is low at power-up, INT_TEMP and EXT_TEMP will remain in POR state (0000 0000b). **MFR_REV will sequence 01h, 02h, 03h, etc. by mask changes. ***CRITICAL only can be written via the CRIT[1:0] pins. It cannot be accessed through the SMBus port.
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MAX1617
PACKAGE DIMENSIONS
16-Pin QSOP PLASTIC PACKAGE CASE TBD ISSUE TBD
PIN 1
.157 (3.99) .244 (6.20) .150 (3.81) .228 (5.80)
.197 (4.98) .189 (4.80)
.010 (0.25) .004 (0.10) .069 (1.75) .053 (1.35)
8 MAX. .050 (1.27) .016 (0.41)
.010 (0.25) .007 (0.19)
.025 (0.635) TYP.
.012 (0.31) .008 (0.21)
Dimensions: inches (mm)
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12
MAX1617/D

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