BQ79606A-Q1 SafeTI™ precision monitor with integrated hardware protector for automotive battery packs |

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SafeTI™ precision monitor with integrated hardware protector for automotive battery packs



The BQ79606A-Q1 device provides simultaneous, high accuracy, channel measurements for three to six battery cells. With the inclusion of a daisy chain communication port, the BQ79606A-Q1 device is stackable (up to 64 devices) to support the large stack configurations found in battery packs for electrified automotive drive trains. Providing a Delta Sigma converter per cell input, the BQ79606A-Q1 allows simultaneous measurement of the battery voltages.

The BQ79606A-Q1 includes an auxiliary ADC that supports cell temperature measurements for up to six NTCs as well as internal rails to enable safety checks for the device. A die temperature measurement ADC is also included to provide temperature correction to enable high accuracy results over an extended temperature range.

Host communication to the BQ79606A-Q1 device is done via dedicated UART interface. Additionally, an isolated, differential daisy-chain communication interface that supports either capacitor or transformer isolation allows the host to communicate with the entire battery stack. The daisy-chain communication interface can be configured (optional) in a ring architecture that allows the host to talk to devices at either end of the stack in cases of communication line breaks.


  • Qualified for automotive applications
  • AEC-Q100 Qualified with the following results:
    • Device temperature grade 2: –40°C to +105°C ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • Voltage monitor, temperature monitor and communication functions: SafeTI™-26262 ASIL-D compliant
  • ± 1.1mV Cell voltage measurement accuracy with an offset
  • Configurable digital low pass filter as low as 1.2Hz
  • Supports simultaneous cell voltage measurements
    • Full-accuracy stack measurements in less than 1 ms (for 96 cells)
  • Optional ring architecture to ensure stack communication even with communication cable break
  • Monitors 3 to 6 cell connections and up to 6 NTC/auxiliary channels
    • Integrated 16-bit analog-to-digital converters (ADC)
  • Integrated high-voltage AFE filter components
  • Designed for robust hot-plug performance
  • Stackable configuration up to 64 devices (1 base + 63 stack, 384-series cells)
  • Isolated differential daisy chain communication
    • Supports transformer or capacitor based isolation
  • Configurable SINC3 digital filter
  • Integrated hardware protector
    • Secondary protection for cell overtemperature and undertemperature
    • Secondary protection for cell overvoltage and undervoltage
  • Hardware protector function: SafeTI™-26262 ASIL-B compliant
  • Integrated cell-balancing MOSFET’s up to 150 mA
  • Designed to pass BCI testing
  • UART Host interface

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Part number Order Vin (Max) (V) Number of series cells (Min) Number of series cells (Max) Features Operating temperature range (C) Rating Package Group Package size: mm2:W x L (PKG)
BQ79606A-Q1 Order now 33     3     6     Cell Balancing
Integrated ADC
Multi-cell Support
Open wire detection
Over-temperature (OT)
Over-voltage (OV)
Requires separate MCU
Stackable (built-in interface)
Temperature sense
Under-temperature (UT)
Under-voltage (UV)    
-40 to 105     Automotive     HTQFP | 48     48HTQFP: 81 mm2: 9 x 9 (HTQFP | 48)    
BQ76PL455A Order now 79.2     6     16     Cell Balancing     -40 to 85     Catalog     TQFP | 80     80TQFP: 144 mm2: 12 x 12 (TQFP | 80)    
BQ76PL455A-Q1 Samples not available 79.2     6     16     Cell Balancing     -40 to 105     Automotive     TQFP | 80     80TQFP: 144 mm2: 12 x 12 (TQFP | 80)    
BQ76PL536A-Q1 Order now 27     3     6     Cell Balancing     -40 to 105     Automotive     HTQFP | 64     64HTQFP: 144 mm2: 12 x 12 (HTQFP | 64)