Features for the BQ77216
- 3-series cell to 16-series cell protection
- High-accuracy overvoltage protection
- ± 10mV at 25°C
- ± 20mV from 0°C to 60°C
- Overvoltage protection options from 3.55V to 5.1V
- Undervoltage protection with options from 1.0V to 3.5V
- Open-wire connection detection
- Overtemperature protection
- Undertemperature protection
- Random cell connection
- Functional safety-capable
- Fixed internal delay timers
- Fixed detections thresholds
- Fixed output drive type for each of COUT and DOUT
- Active high or active low
- Active high drive to 6V
- Open drain with the ability to be pulled up externally to VDD
- Low power consumption ICC ≈ 1µA (VCELL(ALL) < VOV)
- Low leakage current per cell input < 100nA with open wire detection disabled
- Package footprint options:
- Leaded 24-pin TSSOP with 0.65mm lead pitch
Description for the BQ77216
The BQ77216xx family of products provides a range of voltage and temperature monitoring, including overvoltage (OVP), undervoltage (UVP), open wire (OW), undertemperature (UT), and overtemperature (OT) protection for Li-ion battery pack systems. Each cell is monitored independently for overvoltage, undervoltage, and open-wire conditions. With the addition of an external NTC thermistor, the device can detect undertemperature and overtemperature conditions.
In the BQ77216xx device, an internal delay timer is initiated upon detection of an overvoltage, undervoltage, open-wire,undertemperature, or overtemperature condition. Upon expiration of the delay timer, the respective output is triggered into its active state (either high or low, depending on the configuration).
Overvoltage triggers the COUT pin if a fault is detected, and undervoltage triggers the DOUT pin if a fault is detected. If an overtemperature or open-wire fault is detected, then the DOUT and COUT are triggered. For quicker production-line testing, the BQ77216xx device provides a Customer Test Mode (CTM) with greatly reduced delay time.