DS2786BG+

MAXIM INTEGRATED PRODUCTS  DS2786BG+  芯片, 电量计

The is a stand-alone OCV based fuel gauge in 10 pin TDFN package. This device estimates available capacity for rechargeable Li-ion Li+ and Li+ polymer batteries based on the cell voltage in the open-circuit state following a relaxation period. The open-circuit voltage OCV is used to determine relative cell capacity based on a lookup table stored in the IC. This capability makes accurate capacity information available immediately after a battery pack is inserted. The DS2786B uses coulomb counting as a secondary means of estimating relative capacity, remaining capacity is reported in percent along with cell voltage, current and temperature information. Cell characteristics and calculations are stored in on-chip EEPROM. Temperature data is available from an on-die sensor, resistance measurements of a pack identification resistor and pack thermistor are supported by ratiometric measurements on two auxiliary inputs.

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Supply voltage range is 2.5V to 4.5V

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Operating temperature range from -20°C to 70°C

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Measurement and estimated capacity data are accessed through an I2C interface

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Relative capacity calculated from coulomb counter and open-circuit cell voltage OCV battery model

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Accurate warning on low battery conditions, low power consumption

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Optimized for smart phones with push-mail feature

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12bit battery voltage measurement with ±10mV accuracy, 1.22mV LSB0V to 4.5V input range

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11bit bidirectional current measurement with 25µV LSB ±51.2mV dynamic range, 1.67mA LSB at ±3.4A

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Current accumulation measurement resolution ±204.8mVh and ±13.65Ah RSNS = 15mR range

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Internal temperature measurement of 0.125°C LSB, ±3°C accuracy