DS2437 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2437

Smart Battery Monitor

Dallas Semiconductor -> Maxim Integrated 

DS2437

3. The CCA/DCA will accumulate charging/discharging current, and the counter information will be

shadowed to EEPROM each time the respective counter increments by 0.32C. The memory location

is reserved for the CCA/DCA, and the entire page SHOULD NOT be written to.

Because the user has read/write access to the entire EEPROM array, including the CCA/DCA locations,

the user’s software should never allow a write to memory page 07h if the CCA/DCA are used; otherwise

CCA/ DCA information will be overwritten.

Figure 2 below illustrates the activity of the ICA, CCA, and DCA over a sample charge/discharge cycle

of a battery pack, assuming the DS2437 is configured for the ICA to function and the CCA/DCA to

function and shadow data to EEPROM. To simplify the illustration of the accumulators, they are treated

as analog values, although they are digital counters in the DS2437. Note that when the battery becomes

fully discharged, i.e., the ICA value reaches 0, the CCA and DCA register values are maintained.

CCA/DCA Data Relationships Table 5

CCA/DCA

0C

32C

64C

100C

20,971

DIGITAL OUTPUT (Binary)

0000 0000 0000 0000

0000 0000 0110 0100

0000 0000 1100 1000

0010 0001 0011 1000

1111 1111 1111 1111

CURRENT ACCUMULATOR ACTIVITY Figure 2

DIGITAL OUTPUT (Hex)

0000h

0064h

00C8h

0138h

FFFFh

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