IWR6843: VBGAP and VOUT_14APLL

Takatoshi Tsuji

Part Number: IWR6843
Other Parts Discussed in Thread: UNIFLASH

Dear support team,

We have designed original antenna board with IWR6843.

It is succeeded to write firmware by uniflash but to boot up is failed and no UART communication is observed.

Then, we are debugging the board by following "HW bringup guidelines" in attached file, and we notice VBGAP voltage is 0.73V, which is 18% down to 0.9V.

Also, VOUT_14APLL ivoltage s 1.12V, which is also 18% down to 1.4V. I suppose the voltage drop may be critical for booting up.

We would like to know which pins are related to generate VBGAP voltage and VOUT_14APLL voltage.

Also, we are fine if we could get internal voltage subsystem to understand how to generate VBGAP and VOUT_14APLL for IWR6843.

Best regards,

Taka4064.HardwareDesignChecklist_V0p8_IWR6843.xlsx

over 3 years ago

0 Pedrhom Nafisi over 3 years ago

TI__Mastermind 22577 points

Hello,

I understand that you are using custom hardware, however what software is being used to test this? Were there any attempts on trying TI demos such as Out of Box demo to test your hardware?

Best Regards,

Pedrhom Nafisi

0 Takatoshi Tsuji over 3 years ago in reply to Pedrhom Nafisi

Expert 1550 points

Hello ,

We have not used any FW during debugging, because our settting is flashing mode(SOP0 and SOP2 = HIGH).

Best regards,

Taka

+1 Pedrhom Nafisi over 3 years ago in reply to Takatoshi Tsuji

TI__Mastermind 22577 points

Hello Taka,

I would like you to try the following steps:

1. Set device to flashing mode
2. Flash binary via uniflash (Preferably a TI binary for consistency)
3. Set to functional mode
4. Check UART from device
5. Check voltages as mentioned

This is to check the software portion of your custom hardware, if after these steps you still see the same problems, we can rule out any software issues and go forward with hardware support

Best Regards,

Pedrhom Nafisi

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IWR6843: VBGAP and VOUT_14APLL