BQ34Z950: DQ Over UART

Arian Suarez

Part Number: BQ34Z950

I'm working on a project to pull battery info from batteries using the BQ34Z950 fuel gauge chips. The only communication port available is the DQ data line.

I've found the following document on how to implement HDQ over UART but nothing on how to do DQ.

http://www.ti.com/lit/an/slua408a/slua408a.pdf

Is there a similar document for DQ over UART or has anyone done it can can let me know how?

Thanks.

over 6 years ago

0 Batt over 6 years ago

TI__Mastermind 42535 points

Sorry, DQ is rather old. Unfortunately there are no documents regarding that.

0 Batt over 6 years ago in reply to Batt

TI__Mastermind 42535 points

I found some data over google, https://developer.electricimp.com/resources/onewire

0 Arian Suarez over 6 years ago in reply to Batt

Prodigy 50 points

From what I've read HQ and one wire may look similar but the timing is different.

I've created a bit banging arduino sketch to talk to the BQ34Z950 over DQ. I'll post it if anyone wants it.

I'm going to work on a UART version now.

0 Arian Suarez over 6 years ago in reply to Arian Suarez

Prodigy 50 points

hdq_battery_reg.zip

0 Batt over 6 years ago in reply to Arian Suarez

TI__Mastermind 42535 points

Thank you, Arian. Appreciate your help.

We will flag this thread to help others. You can also choose to tag it as DQ, UART.

0 Arian Suarez over 6 years ago in reply to Batt

Prodigy 50 points

Ok so DQ over UART is possible using the following wiring, setting the baud rate to 3440 with 2 stop bits, 8 data bits. I'll include the new arduino sketch. Ignore the HDQ title that's just what I started from.

1050.hdq_battery_reg.zip

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BQ34Z950: DQ Over UART