DS2786B Description
The DS2786B 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.
DS2786B Key Features
- Relative Capacity Calculated from bination Coulomb Counter and Open-Circuit Cell Voltage (OCV) Battery Model
- Accurate Warning of Low-Battery Conditions Even on First Cycle (No Learn Cycle Needed)
- 12-Bit Battery Voltage Measurement ±10mV Accuracy 1.22mV LSB, 0V to 4.5V Input Range
- 11-Bit Bidirectional Current Measurement 25µV LSB, ±51.2mV Dynamic Range 1.67mA LSB, ±3.4A (RSNS = 15mΩ)
- Current Accumulation Measurement Resolution ±204.8mVh Range ±13.65Ah (RSNS = 15mΩ)
- Internal Temperature Measurement 0.125°C LSB, ±3°C Accuracy
- Two 11-Bit Auxiliary Input-Voltage Measurements ±8 LSB Accuracy, Ratiometric Inputs Eliminate Supply Accuracy Issues
- VOUT Pin Drives Resistive Dividers, Reduces Current Consumption
- 2-Wire Interface
- Low Power Consumption Active Current: 50µA (typ), 80µA (max) Sleep Current: 1µA (typ), 3µA (max)