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BQ27750: About the specifications of BQ27750

user4522287
Prodigy 180 points

Part Number: BQ27750

Are all the contents described in the specification of bq27750 correct?

 

According to our suppliers, bq27750 has a defective chip, and we heard that it was designed exclusively for SMBus.

Does the bq27750 not support I2C communication, is it designed exclusively for SMBus?

Please tell me the maximum value of IOL.

Is it possible to correspond to IOL = 3 mA described in the specifications?

 

And although I used bq27545-g1 before, when it changed to bq27750, Low level of I2C communication rose about 0.4V.

What causes this difference?

 

It will be helpful if you can answer as soon as possible.

  • 0
    TI__Guru* 76230 points

    Hi,

    The data sheet for the bq27750 has the specifications for the i2c comm and lists the min as 0.3x vreg with vreg being 1.8V. The hardware plattform for the bq27545 is different from that of the bq27750.

    The bq27750 is not designed for Smbus. The data sheet lists the device as i2c, although the  firmware/hardware is based off the bq28z610 which in turn is based off the bq40z50-r2. The bq40z50 was designed with  SMBUs specs in mind hence the reason you are seeing the differences you see between both devices.

    thanks

    Onyx

  • 0 in reply to Onyx Ahiakwo
    Prodigy 180 points

    Hello,

    Thank you for your reply.

    Please answer each of the following items.

    ①Does the bq27750 chip have a problem with I2C communication?

    ②Is there any information not feedback in the latest bq27750 data sheet?

    ③Does bq27750 support I2 communication?

    ④What is the IOL limit for bq27750?

      「6.25 I2C Interface I/O」 on page 11 of the bq27750 data sheet states that IOL = 3mA, so I think the upper limit is 3mA or more.

    ⑤In the case of IOL=3mA, there is the description that the maximum VOL is 0.4V in both bq27750 and bq27545data sheets.

       There is a difference when comparing each VOL with our PCB.

       What differences in hardware will cause this difference?

       I want to know the mechanism.

    It will be helpful if you can answer as soon as possible.

    thanks.