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

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DS2437

Smart Battery Monitor

Dallas Semiconductor -> Maxim Integrated 

DS2437

Control function commands may be issued which instruct the DS2437 to perform a temperature

measurement or battery voltage A/D conversion. The result of these measurements will be placed in the

DS2437’s memory map, and may be read by issuing a memory function command which reads the

contents of the temperature and voltage registers. Additionally, the charging/discharging battery current is

measured without user intervention, and again, the last completed result is stored in DS2437 memory

space. The DS2437 uses these current measurements to update three current accumulators: one stores net

charge for gas gauge calculations, the second accumulates the total charging current over the life of the

battery, and the remaining accumulator tallies battery discharge current. The real time clock data, which

can be used in calculating battery self-discharge or time-related charge termination limits, also resides in

the DS2437 memory map and can be extracted with a control function command. The nonvolatile user

memory of the DS2437 consists of 40 bytes of EEPROM. These locations may be used to store any data

the user wishes and are written to using a memory function command. All data and commands are read

and written least significant bit first.

PARASITE POWER

The block diagram (Figure 1) shows the parasite-powered circuitry. This circuitry “steals” power

whenever the DQ pin is high. DQ will provide sufficient power as long as the specified timing and

voltage requirements are met (see the section titled “1-Wire Bus System”). The advantage of parasite

power is that the ROM may be read in absence of normal power, i.e., if the battery pack is completely

discharged.

DS2437 BLOCK DIAGRAM Figure 1

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