BQ77216

• 3-series cell to 16-series cell protection
• High-accuracy over voltage protection
  • ± 10 mV at 25°C
  • ± 20 mV from 0°C to 60°C
• Overvoltage protection options from 3.55 V to 5.1 V
• Undervoltage protection with options from 1.0 V to 3.5 V
• Open-wire connection detection
• Overtemperature 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 6 V
  • Open drain with ability to be pulled up externally to VDD
• Low power consumption I_CC ≈ 1 µA (V_CELL(ALL) < V_OV)
• Low leakage current per cell input < 100 nA with open wire detection disabled
• Package footprint options:
  • Leaded 24-pin TSSOP with 0.65-mm lead pitch

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The BQ77216 family of products provides a range of voltage and temperature monitoring including overvoltage (OVP), undervoltage (UVP), open wire (OW), 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 overtemperature conditions.

In the BQ77216 device, an internal delay timer is initiated upon detection of an overvoltage, undervoltage, open-wire, 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).

The 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 both the DOUT and COUT will be triggered. For quicker production-line testing, the BQ77216 device provides a Customer Test Mode (CTM) with greatly reduced delay time.