TPS65916EVM: Unable to use EVM's I2C connection TPS659162

dan lu

Part Number: TPS65916EVM

Dear all,

I use the TPS65916EVM to connect to the TPS659162RZGR and want to control the LDO output voltage through I2C, but it will pop up the window as shown.

I connect the TPS65916EVM J7 and J12 directly to my TPS659162 I2C_SDA and I2C_SCL.

How can I solve this problem? I can control the TPS659162 output voltage in other boards through the TPS65916EVM

thanks,

Dan.

over 5 years ago

0 Nastasha over 5 years ago

TI__Genius 10000 points

Dan,

Hi, can you verify that this EVM has all the correct jumpers populated? See the user guide (Figure 1) for assistance how to populate the jumpers: www.ti.com/.../sliu021.pdf

It looks like you may be missing at least one. Let me know if this resolves your I2C communication issue.

Thanks,
Nastasha

0 dan lu over 5 years ago in reply to Nastasha

Prodigy 200 points

Dear Nastasha,

I verified that the EVM board is the correct jumper, but it still doesn't start.
I currently have a few questions:
Can I separately control the TPS659162 on different boards through the EVM?
If this is feasible, what changes will my jumper do?

Currently I only connect the SDA and SCL of the TPS659162 to the EVM.

Thanks,
Dan

0 Nastasha over 5 years ago in reply to dan lu

TI__Genius 10000 points

Dan,

You should be able to control the TPS659162 on another board. You would need SDA, SCL, and GND connections between both boards. Please add a ground connection. Also, can you scope the SDA and SCL lines to see what is being sent to the device.

Thanks,

Nastasha

0 dan lu over 5 years ago in reply to Nastasha

Prodigy 200 points

Dear Nastasha,

A new problem has occurred, as shown in the picture.

I looked at the EVM information. I think that J26 has no other effect than letting GPIO5 have voltage, and GPIO5 in my other board TPS659162 already uses a pull-up resistor with a voltage.

I have measured the voltage on both the GPIO5 and RESET_OUT on the TPS659162 board.