ds2436b Maxim Integrated Products, Inc., ds2436b Datasheet
ds2436b
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ds2436b Summary of contents
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... Information is sent to/from the DS2436 over a 1-Wire interface, so that battery packs need only have three output connectors: power, ground, and the 1-Wire interface. 1-Wire is a registered trademark of Dallas Semiconductor. Battery ID/Monitor Chip PACKAGE OUTLINE DALLAS DS2436 GND 150-mil, 8-Pin SOIC DS2436B+ TO-92 PACKAGE PIN DESCRIPTION GND - Ground DQ - Data In/Out V - Supply/Battery Connection DS2436 ...
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... DQ line whenever it is high. DQ will provide sufficient power for read operations as long as specified timing and voltage requirements are met (see the section titled “1-Wire Bus System”). MARKING PACKAGE INFORMATION DS2436 TO-92 DS2436 DS2436B+ on Tape-and-Reel DS2436 SOIC DS2436 DS2436Z+ on Tape-and-Reel DS2436 TO-92 ...
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DS2436 BLOCK DIAGRAM Figure 1 TEMPERATURE MEASURING CIRCUITRY A/D CONVERTER V DD 64-BIT ROM ID AND DQ 1-WIRE PORT GDD CONTROL LOGIC AND MEMORY FUNCTION CONTROL 256-BIT SCRATCHPAD 64-BIT SCRATCHPAD TEMPERATURE REGISTER STATUS REGISTER VOLTAGE REGISTER CYCLE ...
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DS2436 MEMORY PARTITIONING Figure 2 LSB MSB LSB MSB LSB MSB LSB MSB LSB MSB ...
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DS2436 MEMORY MAP Figure 3 PAGE 1 USER BYTE USER BYTE USER BYTE USER BYTE SP1 USER BYTE OR USER BYTE NV1 USER BYTE USER BYTE USER BYTE USER BYTE USER BYTE USER BYTE USER BYTE USER BYTE USER BYTE ...
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DS2436 MEMORY MAP (cont’d) Figure 3 PAGE 2 USER BYTE USER BYTE USER BYTE USER BYTE SP2 USER BYTE OR USER BYTE NV2 USER BYTE USER BYTE RESERVED ADDRESS SPACE BYTE ADDRESS 0 20h 1 21h 2 22h 3 23h ...
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DS2436 MEMORY MAP (cont’d) Figure 3 PAGE 3 USER BYTE USER BYTE USER BYTE USER BYTE SP3 USER BYTE OR USER BYTE SRAM USER BYTE USER BYTE RESERVED ADDRESS SPACE BYTE ADDRESS 0 40h 1 41h 2 42h 3 43h ...
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DS2436 MEMORY MAP (cont’d) Figure 3 PAGE 4 TEMPERATURE LSB TEMPERATURE MSB STATUS LSB REGISTERS STATUS MSB RESERVED ADDRESS SPACE VOLTAGE LSB VOLTAGE MSB RESERVED ADDRESS SPACE BYTE ADDRESS 0 60h 1 61h 2 62h 3 63h 4 64h 5 ...
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DS2436 MEMORY MAP (cont’d) Figure 3 PAGE 5 MFG ID LSB MFG ID MSB CYCLE CTR LSB REGISTERS CYCLE CTR MSB RESERVED ADDRESS SPACE BYTE ADDRESS 0 80h 1 81h 2 82h 3 83h 31 9Fh ...
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MEMORY The DS2436’s memory is divided into five pages, each page filling 32 bytes of address space. Not all of the available addresses are used, however. Refer to the memory map of Figure 3 to see actual addresses which are ...
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TEMPERATURE REGISTERS (60h-61h) The DS2436 can measure temperature without external components. The resulting temperature measurement is placed in a two-byte Temperature Register. This register is implemented in SRAM, and therefore will hold data until the battery voltage falls below minimum ...
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STATUS REGISTER (62h-63h) The Status Register is a two-byte read only register at addresses 62h and 63h. Address 62h is the least significant byte of the Status Register and is currently the only address with defined status bits; the other ...
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VOLTAGE/DATA RELATIONSHIP Table 2 TEMPERATURE 0.010V 2.4V 3.6V 5V 7.2V 9.99V 10V PAGE 5 The fifth page of memory holds the Manufacturer ID number, as well as a 2-byte counter for counting the number of battery charge/discharge cycles. MANUFACTURER ID ...
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CRC GENERATION The DS2436 has an 8-bit CRC stored in the most significant byte of the 64-bit ROM. The bus master can compute a CRC value from the first 56 bits of the 64-bit ROM and compare it to the ...
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ROM FUNCTIONS FLOW CHART Figure ...
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CRC CODE Figure 6 1-WIRE BUS SYSTEM The 1-Wire bus is a system which has a single bus master and one or more slaves. The DS2436 behaves as a slave. All data is communicated LSB first. The discussion of ...
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HARDWARE CONFIGURATION Figure 7 Read ROM [33h] This command allows the bus master to read the DS2436’s 8-bit family code, unique 48-bit serial number, and 8-bit CRC. This command can only be used if there is a single DS2436 on ...
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The search process is as follows: 1. The bus master begins the initialization sequence by issuing a reset pulse. The slave devices respond by issuing simultaneous presence pulses. 2. The bus master will then issue the search ROM command on ...
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The bus master reads the remainder of the ROM bits for ROM1 and communicates to the underlying logic if desired. This completes the second ROM search pass, in which another of the ROMs was found. 13. The bus master ...
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Copy SP1 to NV1 [22h] This command copies the entire contents (24 bytes) of Scratchpad 1 (SP1) to its corresponding nonvolatile memory (NV1). The EEPROM memory of the DS2436 cannot be written to directly by the bus master; however, the ...
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PAGE 4 AND 5 COMMANDS Convert T [D2h] This command instructs the DS2436 to initiate a temperature conversion cycle. This sets the TB flag. When the temperature conversion is done, the TB flag is reset and the temperature value is ...
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DS2436 COMMAND SET Table 3 INSTRUCTION Reads bytes from Read Scratchpad DS2436 Scratchpad Writes bytes to Write Scratchpad Scratchpad Copies entire contents of SP1 to NV1 Copy SP1 to NV1 Copies entire contents of SP2 to NV2 Copy to SP2 ...
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NOTES: 1. Temperature conversion takes ms. 2. A/D conversion takes ms. 3. Temperature and A/D conversions cannot take place simultaneously. I/O SIGNALING The DS2436 requires strict protocols to insure data integrity. The protocol consists ...
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Read Time Slots The host generates read time slots when data read from the DS2436. A read time slot is initiated when the host pulls the data line from a logic high level to logic low level. ...
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READ/WRITE TIMING DIAGRAM Figure 9 LINE TYPE LEGEND: Bus master active low Both bus master and DS2436 active low DS2436 active low Resistor pullup ...
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DETAILED MASTER READ “1” TIMING Figure 10 RECOMMENDED MASTER READ “1” TIMING Figure 11 LINE TYPE LEGEND: Bus master active low Both bus master and DS2436 active low DS2436 active low Resistor pullup ...
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ABSOLUTE MAXIMUM RATINGS* Voltage Relative to Ground DD Voltage on any other pin relative to Ground Operating Temperature Storage Temperature Soldering Temperature ∗ This is a stress rating only and functional operation of the device at these ...
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BATTERY VOLTAGE MONITOR PARAMETER SYMBOL Resolution Input Voltage Range Total Error Conversion Time No Missing Code Temperature Range Monotonicity AC ELECTRICAL CHARACTERISTICS: 1-WIRE INTERFACE PARAMETER Temperature Conversion Time Time Slot Recovery Time Write 0 Low Time Write 1 Low Time ...
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WRITE 1 TIME SLOT 1-WIRE WRITE 0 TIME SLOT 1-WIRE READ 0 TIME SLOT 1-WIRE RESET PULSE 1-WIRE PRESENCE DETECT ...