A battery management system (BMS) can be comprised of many functional blocks, including cutoff FETs, a fuel gauge monitor, cell voltage monitor, cell voltage balance, real-time clock (RTC), temperature monitors, and a state machine. There are also many types of battery management ICs available. The grouping of the functional blocks varies widely – from a simple analog front-end that offers balancing and monitoring, and requires a microcontroller (MCU), to a standalone, highly integrated solution that runs autonomously.
This reference design utilizes an ISL94212 Li-ion battery manager IC, which supervises up to 12 series of connected cells. The device provides accurate monitoring and three cell balancing modes – manual balancing mode, timed balancing and auto balance mode with extensive system diagnostics functions. The BMS IC communicates to a host MCU via an SPI interface and to other BMS IC devices using a robust, proprietary, two-wire daisy chain system.
|RL78/G14||Low power consumption, high function general-purpose microcontrollers||RL78/G14 Hardware User's Manual||Select Specific Device|
|Li-Ion Battery Manager|
|ISL94212||Multi-Cell Li-ion Battery Manager||Datasheet||Buy/Sample|
|ISL8117||Synchronous Step-Down PWM Controllers||Datasheet||Buy/Sample|
|ICL3221E||±15kV ESD Protected, +3V to +5.5V, 1µA, 250kbps, RS-232 Transmitters/Receivers||Datasheet||Buy/Sample|