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Original question:

BQ76940: Advanced AFE Chip required against LTC smart AFE

BQ76940: Existing Code of Bq76940 with St microcontroller

smash Micheal
Intellectual 1000 points
Part Number: BQ76940
Other Parts Discussed in Thread: BQ76930, BQ76952, , BQ76PL455A-Q1

Dear Texas Instruments,

  • Am having 2 BMS running with me, one is 15s and other is 20s.(2 series of Bq76930)
  • Can same code be used with Bq76952 AFE with nominal changes?
  • Also how does Bq76940 , Bq76952 & Bq76L445a-q1 are different form each other?
  • In Aobve 3 AFE, can simultaneously Balancing be done? 
  • And what is the Internal Balancing Mosfet Current driving maximum Capacity for Balancing ? ALso in above 3 AFE's, do we need external Mosfet for Balancing or not please share?

Rohit

  • 0
    TI__Guru* 79533 points

    Hi Rohit,

    The BQ76952 has many more options and features than the BQ76930 / BQ76940, so the code will be very different. There is example code available for download using the MSP430 (https://www.ti.com/lit/zip/sluc701). I have also noticed some users have started to share code for the BQ76952 with other MCUs on GitHub - you may want to search to see what you can find.

    The BQ76952 has several differences from the BQ76940. The voltage and current measurement accuracy are improved, the measurement speed is much faster, the BQ76952 drives high-side FETs, it supports additional communication protocols, it includes automated cell balancing and automated FET control to recover from protection faults. If the BQ76940 meets your needs, it is a good device and may be simpler to understand its limited features. The BQ76952 is our newest industrial battery monitor with better performance and features. 

    For cell balancing, the BQ76940 can support only 5mA of balance current unless external FETs are used. The BQ76952 can support 50mA without external FETs. External FETs can be added for higher balance current. Both can balance multiple cells simultaneously, but we do not recommend balancing adjacent cells at the same time. This app note on Cell Balancing with the BQ76952 may be helpful: https://www.ti.com/lit/an/sluaa81/sluaa81.pdf 

    The BQ76PL455A-Q1 is an automotive battery monitor and is much different from the BQ76940 and BQ76952. It is stackable with daisy-chain communications so it is simpler for one microcontroller to interface to multiple devices. It may support higher balance current and it is designed to meet automotive industry standards. Example code is available for download for this device too. 

    Best regards,

    Matt