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BQ34Z110: I have Question. help me please

Jae Cheong Jeong
Intellectual 260 points
Part Number: BQ34Z110

Hello, I'm Denis Jeong.

I have questions.

I hope to want to answer as step by step.

1. When I measure battery voltage through BQ34Z110, I want measurement of only battery voltage. must I connect SRP, SRN, and PACK??
when I measure bettery voltage , must I connect SRP, SRN, and PACK??

2. I refer to this website www.mikrocontroller.net/.../339243, so construct the my circuit .
was that circuit wrong??? Did I fail to receive voltage value(MSB and LSB) through BQ34Z110 because that?

3. When I send data format for receiving measured battery voltage as below way, Do I sent wrong data format?
Do I failed to receive measured battery voltage because I sent wrong data format?

I sent data format as follows.

Ⅰ. "Startbit --- 0xAA --- 0x08 --- Repeated START --- 0xAB --- Data Read(LSB) --- Data Read(MSB) --- End"
Ⅱ. "Startbit --- 0x55 --- 0x08 --- Repeated START --- 0x55 --- Data Read(LSB) --- Data Read(MSB) --- End"
Ⅲ. "Startbit --- 0xAA --- 0x08 --- 0x09 --- Repeated START --- 0xAB --- Data Read(LSB) --- Data Read(MSB) --- End"
Ⅳ. "Startbit --- 0x55 --- 0x08 --- 0x09 --- Repeated START --- 0x55 --- Data Read(LSB) --- Data Read(MSB) --- End"
Ⅴ. "Startbit --- 0xAA --- 0x08 --- End --- 0xAA --- Data Read(LSB) --- End --- Startbit --- 0xAA --- 0x09 --- End --- Startbit --- 0xAB --- Data Read(LSB) --- End --- Startbit --- 0xAB --- Data Read(MSB) --- End"
Ⅵ. "Startbit --- 0x55 --- 0x08 --- End --- 0x55 --- Data Read(LSB) --- End --- Startbit --- 0x55 --- 0x09 --- End --- Startbit --- 0x55 --- Data Read(LSB) --- End --- Startbit --- 0x55 --- Data Read(MSB) --- End"

4. Where did I make mistake? Why did I fail to receive measured battery voltage(MSB, LSB)? Where do I make wrong?

I'm urgently needed to help. I don't have long time......

help me please...

  • 0
    TI__Mastermind 34775 points

    Have you measured the voltage at the BAT pin 4 of bq34z110 with a multimeter? It should be less than 5V going through the voltage divider when VEN is high (2.5V). What is the state of the VEN pin 2? You need to configure VEN to 1 and CE should be connected to REGIN. REG25 should be ~2.5V.

  • 0 in reply to Damian Lewis
    TI__Mastermind 34775 points
    PACK connection not required for measuring battery voltage. SRP and SRN connection for current measurement when system or charger connected to the PACK.
  • 0 in reply to Damian Lewis
    Intellectual 260 points
    Thanks Damian Lewis. I measured battery voltage through BQ34Z110 thanks to your reply.

    but I also have an other questoin.

    I want to measure battery of capacity.

    but that was impossible by using my circuit.

    I sent 0x02/0x03 then I received 0x00/0x00.

    so I think, when I measure battery of capacity through BQ34Z110, I'm likely to connect SRP, SRN, and PACK to my circuit. is that right??

    when I I measure battery of capacity through BQ34Z110, Will I connect SRP, SRN, and PACK to my circuit?