BQ2018SN-E1

BATTERY FUEL GAUGE, LI-ION, 5.5V, SOIC-8.

The BQ2018SN-E1 is a Multi-chemistry Charge/Discharge Counter with high-speed 1-wire I/F (HDQ). It works with an intelligent host controller, providing state-of-charge information for rechargeable batteries. The BQ2018 measures the voltage drop across a low-value series sense resistor between the negative terminal of the battery and the battery pack ground contact. By using the accumulated counts in the charge, discharge and self-discharge registers, an intelligent host controller can determine battery state-of-charge information. To improve accuracy, an offset count register is available. The system host controller is responsible for the register maintenance by resetting the charge in/out and self-discharge registers as needed. It also features 128 bytes of NVRAM registers. The upper 13 bytes of NVRAM contain the capacity monitoring and status information.