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TIDA-010030: I2C COMMUNICATION

SAPTARSHI BISWAS
Prodigy 110 points
Part Number: TIDA-010030
Other Parts Discussed in Thread: BQ76940, BQ34Z100, EV2400

Tool/software:

HI,

1. FOR I2C COMMUNICATION TO HAPPEN WITH MSP430 CONTROLLER AND BQ76940, IS PORT P1 SCL LINES AND SDL LINES TO DO EXTERNAL SHORT WITH SCL AND SDL GAUGE LINES.

2. DOES PULL UP RESISTORS TO ENABLED AT MSP430 CONTROLLER PORT 4.6 AND P4.7TO MAKE IT WORK. OR EXTERNAL PULL UP RESISTORS 10K ARE ENOUGH

REGARDS

S BISWAS

  • 0
    TI__Expert 3356 points

    Hi, 

    I have looped in our designer and please expect 1 more working day for the reply.

    Thanks. 

    Ryan Tan 

  • 0
    TI__Expert 4220 points

    Hi S BISWAS,

    See my comments below:

    1. Yes. Short P1 to enable the on-board MCU I2C communication. Leave it open to connect it to external I2C controller.
    2. Could you clarify your question? Do you mean the pull up resistor R81,R83?

    Kian

  • 0 in reply to Kian Lin
    Prodigy 110 points

    Hi kian Lin,

    thanks for the reply, it worked.

    2. i was mentioning about internal pull resistors of MCU and external resistors R81, 83.

    3. One more Question to add here,

    when i want to calibrate BQ34Z100 using EV2400, there was menage on the down screen "NO ACKNOWLEDGEMENT FROM DEVICE". how to solve this?

    thanks 

    S Biswas

  • 0 in reply to SAPTARSHI BISWAS
    TI__Expert 4220 points

    Hi S，

    1. You can choose either R81,R83 for pullup or using external pullup. The MOSFET Q18 is added here to enable/disable R83 and R81.
    2. I suggest you initiate a new thread to ask BQ34Z100 related questions because we have other colleagues to support this devices.

    BRs

    Kian