DS2434 Dallas Semiconducotr, DS2434 Datasheet
DS2434
Available stocks
Related parts for DS2434
DS2434 Summary of contents
Page 1
... The DS2434 also performs the essential function of monitoring battery temperature, without the need for a thermistor in the battery pack. Information is sent to/from the DS2434 over a 1-Wire interface, so that battery packs need only have three output connectors; power, ground, and the 1-Wire interface. ...
Page 2
... SRAM, 4) Temperature Sensor, and 5) ID Register. All data is read and written least significant bit first. Access to the DS2434 is over a 1-Wire interface. Charging parameters and other data such as battery chemistry, gas gauge information, and other user data would be stored in the DS2434, allowing this information to be permanently stored in the battery pack. Nonvolatile (E if the battery goes dead ...
Page 3
... DS2434 MEMORY PARTITIONING Figure DS2434 ...
Page 4
... DS2434 ADDRESSABLE RAM MEMORY MAP Figure DS2434 ...
Page 5
... DS2434 ADDRESSABLE RAM MEMORY MAP (cont’d) Figure DS2434 ...
Page 6
... This section of memory may be used to store gas gauge and self-discharge information. If the battery dies and this information is lost moot because the user can easily determine that the battery is dead. PAGE 4 The fourth page of memory is used by the DS2434 to store the converted value of battery temperature. A 2-byte status register is also provided. TEMPERATURE REGISTERS (60h-61h) The DS2434 can measure temperature without external components ...
Page 7
... The fifth page of memory holds the battery manufacturer ID number as well as a 2-byte counter for counting the number of battery charge/discharge cycles. 8°C 4°C 2°C 7-BIT BINARY TEMP READING, SHOWS 1°C INCREMENTS X X LOCK 128 DS2434 1°C 1/2°C LSB NVB TB 62h X X 63h BYTE ...
Page 8
... The ID Register is a 16-bit ROM register that can contain a unique identification code, if purchased from Dallas Semiconductor. This ID number is programmed by Dallas Semiconductor, is unchangeable, and is unique to each customer. This ID number may be used to assure that batteries containing a DS2434 have the same manufacturer ID number as a charger configured to operate with that battery pack. This feature may be used to prevent charging of batteries for which the charging circuit has not been designed ...
Page 9
... This command copies the entire contents (32 bytes) of SRAM to its corresponding scratchpad RAM (SP3). This command does not use a start address; the entire contents of SRAM will be copied to SP3. The SRAM memory of the DS2434 cannot be read directly by the bus master; however, the SRAM may be copied to the scratchpad RAM. ...
Page 10
... DS2434 COMMAND SET Table 1 INSTRUCTION DESCRIPTION Reads bytes from Read Scratchpad DS2434 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 to NV2 Copies entire contents Copy SP3 to SRAM to SP3 to SRAM ...
Page 11
... TX RX 1-WIRE BUS SYSTEM The DS2434 1-Wire bus is a system which has a single bus master and one slave. The DS2434 behaves as a slave. The DS2434 is not able to be multidropped, unlike other 1-Wire devices from Dallas Semiconductor. The discussion of this bus system is broken down into three topics: hardware configuration, transaction sequence, and 1-Wire signaling (signal types and timing) ...
Page 12
... The presence pulse lets the bus master know that the DS2434 is on the bus and is ready to operate. For more details, see the “1-Wire Signaling” section. ...
Page 13
... The DS2434 samples the I/O line in a window after the I/O line falls. If the line is high, a Write 1 occurs. If the line is low, a Write 0 occurs (see Figure 6). ...
Page 14
... INITIALIZATION PROCEDURE “RESET AND PRESENCE PULSES” Figure 5 LINE TYPE LEGEND: Bus master active low Both bus master and DS2434 active low DS2434 active low Resistor pullup DS2434 ...
Page 15
... READ/WRITE TIMING DIAGRAM Figure 6 LINE TYPE LEGEND: Bus master active low Both bus master and DS2434 active low DS2434 active low Resistor pullup DS2434 ...
Page 16
... DETAILED MASTER READ “1” TIMING Figure 7 RECOMMENDED MASTER READ “1” TIMING Figure 8 LINE TYPE LEGEND: Bus master active low Both bus master and DS2434 active low DS2434 active low Resistor pullup DS2434 ...
Page 17
... MIN TYP =- and + + -0 =0.4V -4 =0. I =3.6V to 6.4V) DD MAX UNITS 6.4 6.4 V 6 =3.6V to 6.4V) DD MAX UNITS ½ 2 1.5 mA 500 k =2.7V. DD DS2434 NOTE NOTES ...
Page 18
... MIN TYP t 700 CONV t 60 SLOT t 1 REC t 60 LOW0 t 1 LOW1 t RDV t 480 RSTH t 480 RSTL t 15 PDHIGH t 60 PDLOW C IN/OUT DS2434 =3.6V to 6.4V) DD MAX UNITS NOTES 1000 ms 120 s s 120 240 ...
Page 19
... READ ZERO TIME SLOT 1-WIRE RESET PULSE 1-WIRE PRESENCE DETECT DS2434 ...
Page 20
... DATA SHEET REVISION SUMMARY The following represent the key differences between 04/24/97 and 07/31/97 version of the DS2434 data sheet. Please review this summary carefully. 1. Add surface mount package (16-pin SSOP); page 1. 2. Correct cycle counter LSB description; page 7. 3. Add supply voltage compatibility 12V; page 15. ...