bq76940 Datasheet | Texas Instruments

Features - AFE monitoring features - Pure digital interface - Internal ADC measures cell voltage, die temperature, and external thermistor - A separate, internal ADC measures pack current (coulomb counter) - Directly supports up to three thermistors (103AT) - Hardware protection features - Overcurrent in Discharge (OCD) - Short Circuit in Discharge (SCD) - Overvoltage (OV) - Undervoltage (UV) - Secondary protector fault detection - Additional features - Integrated cell balancing FETs - Charge, discharge low-side NCH FET drivers - Alert interrupt to host microcontroller - 2.5-V or 3.3-V output voltage regulator - No EEPROM programming necessary - High supply voltage absolute maximum (up to 108 V) - Simple I2C patible interface (CRC option) - Random cell connection tolerant 2 Applications - Light electric vehicles (LEV): e Bikes, e Scooters, pedelec, and pedal-assist bicycles - Power tools and garden tools - Battery backup units (BBUS), energy storage systems (ESS), and uninterruptible power supply (UPS) systems - Other industrial battery packs (≥10S) 3 Description The BQ769x0 family of robust analog front-end (AFE) devices serves as part of a plete pack monitoring and protection solution for next-generation, high-power systems, such as light electric vehicles, power tools, and uninterruptible power supplies. The BQ769x0 is designed with low power in mind: Subblocks within the IC may be enabled or disabled to control the overall chip current consumption, and a SHIP mode provides a simple way to put the pack into an ultra-low power state. The BQ76920 device supports up to 5-series cells or typical 18-V packs, the BQ76930 handles up to 10-series cells or typical 36-V packs, and the BQ76940 works for up to 15-series cells or typical 48-V packs. A variety of battery chemistries may be managed with these AFEs, including Li-ion, Li-iron phosphate, and more. Through I2C, a host controller can use the BQ769x0 to implement many battery pack management functions, such as...