Dallas Semiconductor's DS2745, an Li+ battery monitor with an I²C interface can be mounted on either the host side or the battery-pack side of the application. It provides current, accumulated current, voltage, and temperature measurements.
Current is measured bidirectionally over a dynamic range of ±51,2 mV with a resolution of 1,56 μV by monitoring the voltage drop across an external sense resistor. Assuming a 15 mΩ sense resistor, the current-sense range is ±3,4 A with a 1 LSB resolution of 104 μA. Current measurements are performed at regular intervals and accumulated with each measurement to support accurate coulomb counting. Battery voltage is measured through a dedicated voltage-sense input and reported in a two-byte register with 11-bit (4,88 mV) resolution. On-chip temperature measurement is reported in a two-byte register with a resolution of 0,125°C.
The device comes in the tiny 8-pin microMAX package.
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