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| www.maxim-ic.com DS1603 Elapsed Time Counter Module PIN ASSIGNMENT VCC RST www.maxim-ic.com FEATURES Two 32-bit counters keep track of real-time and elapsed time Counters keep track of seconds for over 125 years Battery powered counter counts seconds from the time battery is attached until VBAT is less than 2.5V VCC powered counter counts seconds while VCC is above VTP and retains the count in the absence of VCC under battery backup power Clear function resets selected counter to 0 Read/write serial port affords low pin count Powered internally by a lithium energy cell that provides over 10 years of operation One-byte protocol defines read/write, counter address and software clear function Self-contained crystal provides an accuracy of 2 min per month Operating temperature range of 0C to +70C Low-profile SIP module Underwriters Laboratory (UL) recognized DQ NC CLK OSC GND 1 2 3 4 5 6 7 PIN DESCRIPTION RST CLK DQ GND VCC OSC NC - Reset - Clock - Data Input/Output - Ground - +5V - 1Hz Oscillator Output - No Connect DESCRIPTION The DS1603 is a real-time clock/elapsed time counter designed to count seconds when VCC power is applied and continually count seconds under battery backup power with an additional counter regardless of the condition of VCC. The continuous counter can be used to derive time of day, week, month, and year by using a software algorithm. The V powered counter will automatically record the amount of time CC that V power is applied. This function is particularly useful in determining the operational time of CC equipment in which the DS1603 is used. Alternatively, this counter can also be used under software control to record real-time events. Communication to and from the DS1603 takes place via a 3-wire serial port. A 1-byte protocol selects read/ write functions, counter clear functions and oscillator trim. The device contains a 32.768kHz crystal that will keep track of time to within 2 min/mo. An internal lithium energy source contains enough energy to power the continuous seconds counter for over 10 years. OPERATION The main elements of the DS1603 are shown in Figure 1. As shown, communications to and from the elapsed time counter occur over a 3-wire serial port. The port is activated by driving RST to a high state. Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata. 1 of 8 093002 DS1603 With RST at high level 8 bits are loaded into the protocol shift register providing read/write, register select, register clear, and oscillator trim information. Each bit is serially input on the rising edge of the clock input. After the first eight clock cycles have loaded the protocol register with a valid protocol additional clocks will output data for a read or input data for a write. VCC must be present to access the DS1603. If VCC < VTP , the DS1603 will switch to internal power and disable the serial port to conserve energy. When running off of the internal power supply, only the continuous counter will continue to count and the counter powered by VCC will stop, but retain the count, which had accumulated when VCC power was lost. The 32-bit VCC counter is gated by VCC and the internal 1Hz signal. PROTOCOL REGISTER The protocol bit definition is shown in Figure 2. Valid protocols and the resulting actions are shown in Table 1. Each data transfer to the protocol register designates what action is to occur. As defined, the MSB (bit 7 which is designated ACC) selects the 32-bit continuous counter for access. If ACC is a logical 1 the continuous counter is selected and the 32 clock cycles that follow the protocol will either read or write this counter. If the counter is being read, the contents will be latched into a different register at the end of protocol and the latched contents will be read out on the next 32 clock cycles. This avoids reading garbled data if the counter is clocked by the oscillator during a read. Similarly, if the counter is to be written, the data is buffered in a register and all 32 bits are jammed into the counter simultaneously on the rising edge of the 32nd clock. The next bit (bit 6 which is designated AVC) selects the 32-bit VCC active counter for access. If AVC is a logical 1 this counter is selected and the 32 clock cycles that follow will either read or write this counter. If both bit 7 and bit 6 are written to a logic high, all clock cycles beyond the protocol are ignored and bit 5, 4, and 3 are loaded into the oscillator trim register. A value of binary 3 (011) will give a clock accuracy of 120 seconds per month at +25C. Increasing the binary number towards 7 will cause the real- time clock to run faster. Conversely, lowering the binary number towards 0 will cause the clock to run slower. Binary 000 will stop the oscillator completely. This feature can be used to conserve battery life during storage. In this mode the internal power supply current is reduced to 100 nA maximum. In applications where oscillator trimming is not practical or not needed, a default setting of 011 is recommended. Bit 2 of protocol (designated CCC) is used to clear the continuous counter. When set to logic 1, the continuous counter will reset to 0 when RST is taken low. Bit 1 of protocol (designated CVC) is used to clear the VCC active counter. When set to logical 1, the VCC active counter will reset to 0 when RST is taken low. Both counters can be reset simultaneously by setting CCC and CVC both to a logical 1. Bit 0 of the protocol (designated RD) determines whether the 32 clocks to follow will write a counter or read a counter. When RD is set to a logical 0 a write action will follow when RD is set to a logical 1 a read action will follow. When sending the protocol, 8 bits should always be sent. Sending less than 8 bits can produce erroneous results. If clearing the counters or trimming the oscillator, the data transfer can be terminated after the 8-bit protocol is sent. However, when reading or writing the counters, 32 clock cycles should always follow the protocol. RESET AND CLOCK CONTROL All data transfers are initiated by driving the RST input high. The RST input has two functions. First, RST turns on the serial port logic, which allows access to the protocol register for the protocol data entry. Second, the RST signal provides a method of terminating the protocol transfer or the 32-bit counter transfer. A clock cycle is a sequence of a rising edge followed by a falling edge. For write inputs, data must be valid during the rising edge of the clock. Data bits are output on the falling edge of the clock when data is being read. All data transfers terminate if the RST input is transitioned low and the DQ pin goes to a high- impedance state. RST should only be transitioned low while the clock is high to avoid disturbing the last bit of data. All data transfers must consist of 8 bits when transferring protocol only or 8 + 32 bits when reading or writing either counter. Data transfer is illustrated in Figure 3. 2 of 9 DS1603 DATA INPUT Following the 8-bit protocol that inputs write mode, 32 bits of data are written to the selected counter on the rising edge of the next 32 CLK cycles. After 32 bits have been entered any additional CLK cycles will be ignored until RST is transitioned low to end data transfer and then high again to begin new data transfer. DATA OUTPUT Following the eight CLK cycles that input read mode protocol, 32 bits of data will be output from the selected counter on the next 32 CLK cycles. The first data bit to be transmitted from the selected 32-bit counter occurs on the falling edge after the last bit of protocol is written. When transmitting data from the selected 32-bit counter, RST must remain at high level as a transition to low level will terminate data transfer. Data is driven out the DQ pin as long as CLK is low. When CLK is high the DQ pin is tristated. OSCILLATOR OUTPUT Pin 6 of the DS1603 module is a 1Hz output signal. This signal is present only when VCC is applied and greater than the internal power supply. However, the output is guaranteed to meet TTL requirement only while VCC is within normal limits. This output can be used as a 1-second interrupt or time tick needed in some applications. INTERNAL POWER The internal battery of the DS1603 module provides 35mAh and will run the elapsed time counter for over 10 years in the absence of power. PIN DESCRIPTIONS VCC , GND - DC power is provided to the device on these pins. VCC is the +5V input. When 5V is applied within normal limits, the device is fully accessible and data can be written and read. When a 3V battery is connected to the device and VCC is below 1.25 x VBAT , reads and writes are inhibited. As VCC falls below VBAT the continuous counter is switched over to the internal battery. CLK (Serial Clock Input) - CLK is used to synchronize data movement on the serial interface. DQ (Data Input/Output) - The DQ pin is the bi-directional data pin for the 3-wire interface. RST (Reset) - The reset signal must be asserted high during a read or a write. OSC (One Hertz Output Signal) - This signal is only present when Vcc is at a valid level and the oscillator is enabled. 3 of 9 DS1603 Figure 1. ELAPSED TIME COUNTER BLOCK DIAGRAM Figure 2. PROTOCOL BIT MAP 7 ACC 6 AVC 5 OSC2 4 OSC1 3 OSC0 2 CCC 1 CVC 0 RD 4 of 9 DS1603 Table 1. VALID PROTOCOLS ACTION PROTOCOL ACC AVC OSC2 OSC1 OSC0 CCC CVC RD FUNCTION Read Continuous Counter 1 0 X X X X X 1 Write Continuous Counter 1 0 X X X X X 0 Read VCC Active Counter 0 1 X X X X X 1 Write VCC Active Counter 0 1 X X X X X 0 Clear Continuous Counter 0 0 X X X 1 X X Clear VCC Active Counter 0 0 X X X X 1 X Set Oscillator Trim Bits X = Don't Care 1 1 A B C X X 0 Output continuous counter on the 32 clocks following protocol. Oscillator trim register is not updated. Counters are not reset. Input data to continuous counter on the 32 clocks following protocol. Oscillator trim register is not updated. Counters are not reset. Output VCC active counter on the 32 clocks following protocol, oscillator trim register is not updated. Counters are not reset. Input data to continuous counter on the 32 clocks following protocol. Oscillator trim register is not updated. Counters are not reset. Resets the continuous counter to all zeros at the end of protocol. Oscillator trim register is not updated. Resets the VCC active counter to all zeros at the end of protocol. Oscillator trim register is not updated. Sets the oscillator trim register to a value of ABC. Counters are unaffected. 5 of 9 DS1603 Figure 3. DATA TRANSFER TIMING DIAGRAM: READ/WRITE DATA TRANSFER Note: tCL, tCH, tR, and tF apply to both read and write data transfer. 6 of 9 DS1603 ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground Operating Temperature Range Storage Temperature Range Soldering Temperature Range -0.3V to +7.0V 0C to +70C -40C to +70C See IPC/JEDEC J-STD-020A (See Note 11) This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time can affect reliability. RECOMMENDED DC OPERATING CONDITIONS PARAMETER Supply Voltage Logic 1 Input Logic 0 Input SYMBOL VCC VIH VIL MIN 4.5 2.0 -0.3 TYP 5.0 MAX 5.5 VCC + 0.3 0.8 (0C to +70C) UNITS V V V NOTES 1 1 1 DC ELECTRICAL CHARACTERISTICS PARAMETER Input Leakage I/O Leakage Logic 1 Output Logic 0 Output Active Supply Current Timekeeping Current Battery Trip Point SYMBOL ILI ILO VOH VOL ICC ICC1 VTP MIN -1 -1 2.4 TYP (0C to +70C; V CC = 5V 10%) MAX +1 +1 0.4 1 50 4.5 UNITS A A V V mA A V NOTES 3.0 2 3 4 5 9 CAPACITANCE PARAMETER Input Capacitance I/O Capacitance SYMBOL CI CI/O MIN TYP 5 10 MAX UNITS pF pF (TA = +25C) NOTES 7 of 9 DS1603 AC ELECTRICAL CHARACTERISTICS PARAMETER Data to CLK Setup CLK to Data Hold CLK to Data Delay CLK Low Time CLK High Time CLK Frequency CLK Rise and Fall RST to CLK Setup CLK to RST Hold RST Inactive Time RST Low to I/O High-Z CLK High to I/O High- Z SYMBOL tDC tCDH tCDD tCL tCH fCLK tF, tR tCC tCCH tCWH tRDZ tCDZ MIN 50 60 250 250 DC 100 60 1 (VCC = +5V 10%; 0C to +70C) TYP MAX UNITS ns ns ns ns ns MHz ns ns ns s ns ns NOTES 6 6 6, 7, 8 6 6 6 6 6 6 6 6 200 2.0 500 70 20 (TA = +25C) PARAMETER Expected Data Retention Time SYMBOL tDR MIN 10 TYP MAX UNITS years NOTES 10 NOTES: All voltages are referenced to ground. Logic 1 voltages are specified at a source current of 1mA. Logic 0 voltages are specified at a sink current of 4mA. ICC is specified with the DQ pin open. ICC1 is specified with VCC at 5.0V and RST = GND. Measured at VIH = 2.0V or VIL = 0.8V. Measured at VOH = 2.4V or VOL - 0.4V. Load capacitance = 50pF. Battery trip point is the point at which the VCC powered counter and the serial port stops operation. The battery trip point drops below the minimum once the internal lithium energy cell is exhausted. 10) The expected t R is defined as accumulative time in the absence of V with the clock oscillator D CC running. 11) Real-time clock modules can be successfully processed through conventional wave-soldering techniques as long as temperature exposure to the lithium energy source contained within does not exceed +85C. Post-solder cleaning with water-washing techniques is acceptable, provided that ultrasonic vibration is not used. 1) 2) 3) 4) 5) 6) 7) 8) 9) 8 of 9 DS1603 DS1603 7-PIN MODULE PKG DIM A IN. MM B IN. MM C IN. MM D IN. MM E IN. MM F IN. MM G IN. MM H IN. MM J IN. MM 7-PIN MIN MAX 0.830 0.850 21.08 21.59 0.650 0.670 16.51 17.02 0.310 0.330 7.87 8.38 0.015 0.030 0.38 0.76 0.110 0.140 2.79 3.56 0.015 0.021 0.38 0.53 0.090 0.110 2.29 2.79 0.105 0.135 2.67 3.43 0.360 0.390 9.14 9.91 9 of 9 |
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