L9965C [STMicroelectronics]

The L9965C is a current, voltage, charge and isolation monitor for HV battery packs.

It is part of the L9965 chipset for battery management systems and can be inserted as an addressable element of the same isolated daisy chain (VIF).

• AEC-Q100 qualification ongoing
• Temperature grade 1: -40 °C to +125 °C operating temperature range
• HBM ESD classification level 2
• CDM ESD classification level C4B
• Full ISO26262 compliant, ASIL-D systems ready, documentation available
• 2 independent current sense ADCs
  • 18-bit resolution
  • Input range = ±100 mV
  • < 0.1% gain error, < 1 LSB offset
  • Integrated programmable digital filtering with cutoff frequency from 3.5 kHz to 5 Hz for instantaneous current measurement
  • Fully redundant architecture with cross-check on every current sample
• Integrated coulomb counter
• Fully redundant short circuit detector with programmable threshold and ultrafast reaction time
• 2 programmable (level/PWM encoded) FAULT outputs
• Programmable DC-DC converter controller to enable fast and flexible DC-link precharge
• 10 gate predrivers also compatible with optocouplers
• 11 fully differential analog inputs
• 7 configurable GPIO
• SPI and I²C controller peripherals to interface up to two external EEPROM, L9965P pyro driver, sensors
• SPI target for direct MCU interface
• 3.3 V (VTREF) and 5 V (V5V) LDOs for external sensors supply and biasing
• Embedded NVM for configuration parameters storage and runtime configuration integrity check
• Ultrafast vertical interface peripheral for isolated communication
• Compatible with 18S L9965A cell monitoring chip with a max desynchronization time of 7 us at system level