BQ79606A-Q1: open circuit detection

YuWei Hu

Part Number: BQ79606A-Q1

Hi,

Earlier we asked about the open circuit detection, and now we have found a new problem, wish you could help us to solve it.

We write the open circuit detection program according to the flowchart, when we wrote to assign a value to the VC_CS_CTRL register,

the data transmitted by the serial port was incorrect, as shown in the red line below.

The relevant code is

BQ79606A_Write_Reg(0,VC_CS_CTRL,0x7f,1,FRMWRT_ALL_NR);

and

BQ79606A_Write_Reg(0,VC_CS_CTRL,0x00,1,FRMWRT_ALL_NR);

When we write the above sentences elsewhere, the correct data can be sent from the serial port, as shown in the red line below.

What can we do to solve the problem. Thanks!

over 5 years ago

0 Andy Li55 over 5 years ago

TI__Intellectual 2520 points

Hello User,

Before host issues next command(Read or Wrtie), host should make sure the response frame of previous Read command

is received to avoid the collision of upstream command with down stream response frame.

It looks like that host send Wrtie command right away after sending Read command(C0).

Thanks!

Andy

0 YuWei Hu over 5 years ago in reply to Andy Li55

Prodigy 80 points

Hi,

In the code, we have set a 1ms delay to ensure that the data can be read,

and the above situation still occurs when the VC_CS_CTRL register is set.

We want to know is which part will affect the configuration of this register.

Thanks!

0 Andy Li55 over 5 years ago in reply to YuWei Hu

TI__Intellectual 2520 points

Hello Yuwei,

It is not part issue but communication issue.

From your code, you can find the difference why one was failed(before is C0 broadcast read command) and another was successful(before is D0 broadcast write).

1ms may be not enough depending on how many devices are in the daisy chain and how many data will be transmitted.

Don't send Read command and try setting VC_CS again.

Andy

0 YuWei Hu over 5 years ago in reply to Andy Li55

Prodigy 80 points

Hello Andy,

Thank you for reply, and we found another problem need you to help us.

In a open circuit detection experiment, how does the voltage of a sampling circuit or more change when we disconnect it?

In the experiment, we found that when we disconnected one sampling circuit, the voltage of that circuit became negative. Is this normal? Isn't it generally 0?

Thanks!

0 Roger Hwang over 5 years ago in reply to YuWei Hu

TI__Genius 10785 points

Hello Yuwei,

Can we see your circuit 1st?

How are you performing the openwire?

Typically, not negative voltage but I will comment after reviewing your schematic.

What are you reading?

Roger

0 Leslie Marquez over 5 years ago in reply to Roger Hwang

TI__Genius 9401 points

Hi Yuwei,

Do you still need help with this issue?

Best regards,

Leslie

0 Leslie Marquez over 5 years ago in reply to Leslie Marquez

TI__Genius 9401 points

Hi Yuwei,

I'm going to close this thread. If you still need help please create a new thread so we can support you.

Best regards,

Leslie

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BQ79606A-Q1: open circuit detection