BQ40Z50: BQ40Z50 / USB-8451 communication Problem

Sven Winkler

Part Number: BQ40Z50
Other Parts Discussed in Thread: , BQSTUDIO

Hello,

I want to write a .srec file in the flash memory of the BQ40Z50-R1. For this, I use the interface NI USB-8451 and a LabVIEW API, which I found in the LabVIEW examples. Unfortunately, I get an error message saying that the slave did not acknowledge an address and direction byte transmitted by the I2C master. I can´t read or write any data because of this configuration failure.

I have choosen 100 kHz for the Clock Rate. Further more I send data in Little Endian and I use the block size of 32 bytes, all according to the data sheet of the BQ40Z50.

For the address I tried all values from 0x00 up to 0xFF. Always the same error message. Does anybody know a source for that error?

Thanks

Sven

over 5 years ago

0 Andy Liu (BMS) over 5 years ago

TI__Guru 52115 points

Hi Sven,

I assume that you have a bq40z50 EVM. Make sure you follow the instructions in the EVM user's guide to have all the necessary connections done. In addition, I would suggest you connect the SYS PRES position on the J3 terminal block to PACK– and push the wake button a few times before you try to communicate with bq40z50.

Andy

0 Sven Winkler over 5 years ago in reply to Andy Liu (BMS)

Prodigy 30 points

Hi Andy,

thanks for your reply. I have a bq40z50 EVM, but I want to program the bq40z50 without the EVM, only by using the NI USB-8451.
I already worked with the bqStudio, but I want to write an easy program that does nothing else than programming the bq. Do you know if this is possible?

Sven

0 Andy Liu (BMS) over 5 years ago in reply to Sven Winkler

TI__Guru 52115 points

Hi Sven,

I would suggest you use the TI EVM to create the golden files since the EVM is the most reliable hardware platform.

Once the golden file is ready, I think it is possble to use other tools than bqStudio to program your own boards.

Andy

0 Sven Winkler over 5 years ago in reply to Andy Liu (BMS)

Prodigy 30 points

Thanks, I will try it!

Sven

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BQ40Z50: BQ40Z50 / USB-8451 communication Problem