DS2435 View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated

Part Name

Description

Manufacturer

DS2435

Battery Identification Chip with Time/Temperature Histogram

Dallas Semiconductor -> Maxim Integrated 

DS2435

t1-t8 REGISTERS (64h-73h)

These registers hold the accumulated

time

values

for

the

time/temperature

histogram.

t1

corresponds

to

the time spent in histogram bin 1, t2 the time spent in bin 2, etc., where the bins are defined by the limits

set in TA-TG as shown in Figure 2. The format for the time value stored in these two-byte registers

depends upon the SAMPLE RATE, and is defined in the paragraph describing the SAMPLE RATE

parameter.

t REGISTER (74h-76h)

This 3-byte register is the elapsed time counter, formatted as follows:

The elapsed time counter has an LSB value of 1 minute; the total time which the counter can

accommodate is 224 minutes, or 31.92 years.

Issuing any protocol to the DS2435 prevents the incrementing of the elapsed time counter and histogram

registers until the protocol is cleared by issuing a reset. Therefore, it is imperative that any protocol

issued to the DS2435 be followed by a reset (either after the protocol, if it requires no data, or

immediately following the required data). This is necessary to avoid contention between the counter and

histogram writing process and external processes.

PAGE 5

The fifth page of memory holds the battery manufacturer ID number, a 2-byte counter for counting the

number of battery charge/discharge cycles, histogram bin limits, and sample rate.

ID REGISTER (80h and 81h)

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 ensure that batteries containing a DS2435 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.

CYCLE COUNTER (82h and 83h)

The cycle counter register gives an indication of the number of charge/discharge cycles the battery pack

has been through. This nonvolatile (E2) register is incremented by the user through the use of a protocol

to the DS2435, and is reset by another protocol. The counter is a straight binary counter, formatted as

follows:

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