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BQ34Z110: Help check MCU+ BQ34Z110 schematic and some query

Star Xu
Genius 9645 points
Part Number: BQ34Z110
Other Parts Discussed in Thread: BQ34Z100-G1

Hi

Help check the attached schematic.

A SRP, SRN, P1, P2, TS, HDQ didn’t connect up the BQ34Z110.

I2C wire connect 1.8K Pull-up resistance, and I2C bps is 400K.

12V and 5V are specified on a picture, and they were used Power supply voltage.

Currently between Mcu(Atmega128) and BQ34Z110 still do not communicate.

1. If I connect a CE, REGIN, VSS, SDA and SCL up to a BQ34Z110, between a MCU(ATMega128) and BQ34Z110 can be communication?

2. I config circuit as picture in www.mikrocontroller.net/.../339243, then supply voltage to VEN Pin. but voltage near to 0 voltage.
Is it nomal operation? When I organized a circuit as a picture and then supply Voltage to the VEN pin, the voltage was close to 0V.

After supply voltage to a BQ34Z110, a MCU sent out BlockDataControl Packet to BQ34Z110. but a BQ34Z110 didn’t receive return data.

If I want to BQ34Z110’s normal operate, do I send a start packet(like a something special packet) for BQ34Z110’s normal operate?

Thanks 
Star

  • 0
    TI__Guru 73830 points
    Star,
    Here are some comments to your questions.

    #1: The gauge should be active and able to communicate under those conditions. We recommend using 10 kohm pull-up resistors on the I2C signals. so the 1.8K resistors may be too low. Check the VOH level on the SDA data. It may not go low enough to be recognized.

    #2: The VEN pin pulses high once per second when the device take a voltage reading. It is low otherwise. The signal to the BAT pin should be between 0 and 1V when VEN is high.

    Also, I would recommend that you use the bq34z100-G1, instead of the bq34z110. It offers some new features that will improve performance. The bq34z100-G1 firmware can be programmed to this device and it can be found on the bq34z100-G1 website. Here is an e2e link that can help with the upgrade.

    e2e.ti.com/.../1595705

    Tom