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Original question:

BQ34Z100-R2: Surge Protection for BQ34Z100-R2

BQ34Z100-R2: I want to design the fuel gauge BQ34Z100PWR-R2 for 5S2P battery

Murali C
Prodigy 230 points
Part Number: BQ34Z100-R2
Other Parts Discussed in Thread: BQ25756, BQ34Z100

Tool/software:

Hi

I'm using 5S2P dump pack and standalone charger IC BQ25756 with BQ34Z100PWR-R2. 

I have checked the datasheet, EVM schematics for reference. Still i have few doubts mentioned as below:

  • Based on EVM BQ34Z100, do I need to provide the alert configuration? or can it be left unconnected? if it is not given, TS pin simply can be connected as with NTC 10K and powered with REG25.
  • How to connect the BAT pin, since my battery is 5S2P? I don't want LED display. just need this fuel gauge for battery SOC monitoring.
  • Since i don't use SW1, VEN cannot give input to Q4 fet, so Q5 won't turn on whole translated network won't happen right? So can i keep BAT pin with 16.5K pulled with GND and 3300pF tied to GND. no other mosfet required right? or explain me how it will work?
  • REGIN pin input schematics ?

  • 0
    TI__Mastermind 26495 points

    Hello,

    This question has been assigned within the team and will be followed up with a response when possible.

    Thank you,
    Alan

  • 0 in reply to Alan Frias
    TI__Mastermind 26345 points

    Hi,

    Murali C said:
    Based on EVM BQ34Z100, do I need to provide the alert configuration? or can it be left unconnected? if it is not given, TS pin simply can be connected as with NTC 10K and powered with REG25.

    Not if you will not be using the ALERT feature, the HDQ pin can be GND. 

    correct

    Murali C said:
    How to connect the BAT pin, since my battery is 5S2P? I don't want LED display. just need this fuel gauge for battery SOC monitoring.

    You will connect the top of the battery stack to BAT+ and the bottom to BAT-.

    Murali C said:
    Since i don't use SW1, VEN cannot give input to Q4 fet, so Q5 won't turn on whole translated network won't happen right? So can i keep BAT pin with 16.5K pulled with GND and 3300pF tied to GND. no other mosfet required right? or explain me how it will work?

    VEN will turn on Q4, i am confused on this question, can you clarify?

    Murali C said:
    REGIN pin input schematics ?

    Regin needs a stable power supply, the small circuit connected to the Regin pin functions as an LDO.

    Regards,

    Diego