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BQ79616-Q1: When daisy-chain communication, up to how many 79616 chips can be connected?

Cherry Zhou
Mastermind 22235 points
Part Number: BQ79616-Q1
Other Parts Discussed in Thread: BQ79616

Hi team,

Here's an issue from the customer may need your help:

1) In a space of 1 m x 1 m x 1 m without a complex operating environment, how many chips can be connected when daisy-chain communicating?

2) How to calculate the communication time for the bq79616 daisy chain? Assuming five 79616 daisy-chain communications, how long does it take from the MCU to issue the capture command to the MCU to receive the cell voltage data?

Could you help check this case? Thanks.

Best Regards,

Cherry

  • +1
    TI__Intellectual 2280 points

    HI Cherry,

    1. The limit is more from the physical space instead of chip itself, the BQ79616 has re-clocking built internal and it can support at most 64 devices. (6-bit ID address)

    2. Let's say stack command to read back 32bytes(16 cells voltage data) on 5pcs BQ79616. See below calculation as an example:

    1) Time of stack read command ： 14(base delay)+4(stack re-clock delay)*4+60(6bytes, 10us/byte) = 90us

    2) Time of the response frame: 14+ 4*4 + (6+32)*10*5(32bytes data+ 6 bytes frame/each 616) = 1930us

    Total would be 1930+90 = 2020us 

    Hope this helps