IWR6843AOP: Can not use external XDS110 flash IWR6843AOP with UART

zhu paul

Part Number: IWR6843AOP
Other Parts Discussed in Thread: UNIFLASH, IWR1443, IWR1443BOOST

Hi，

I have a custom board of IWR6843AOP without CP2105,and an external XDS110. I want to flash IWR6843AOP with the external XDS110,but failed.The Uniflash cannot find IWR6843AOP and reports error.

Pictures below show the connection of IWR6843AOP and XDS110,and the error reported by Uniflash.

What is wrong I dmake?

Thank you.

over 3 years ago

0 Vaibhav Mahimkar over 3 years ago

TI__Mastermind 23725 points

Hello

Have you tried to program using the following combination to ensure this conceptually works.

TI'EVM + External xds via Uniflash.

Thank you,

Vaibhav

0 zhu paul over 3 years ago in reply to Vaibhav Mahimkar

Prodigy 10 points

Yes,I tried to connet iwr1443 + External xds via Uniflash,it was the same phenomenon。But I do not find what is wrong。

+1 CHETHAN KUMAR Y.B. over 3 years ago in reply to zhu paul

TI__Mastermind 25835 points

Hello Zhu,

Please disconnect the JTAG & RS232 lines and any other I/Os connected to external boards/adapters. This happens when you power cycle the radar board then the below condition would be violated.. And VIO could get power through the non-fail safe I/Os.

Connect JTAG/RS232 lines only after SOP assertion and reset release.

Thanks and regards,

CHETHAN KUMAR Y.B.

0 zhu paul over 3 years ago in reply to CHETHAN KUMAR Y.B.

Prodigy 10 points

Thanks for you reply,the board had another error,after it repaired I will try again.

0 CHETHAN KUMAR Y.B. over 3 years ago in reply to zhu paul

TI__Mastermind 25835 points

Hello Zhu,

Thanks for the confirmation and update.

Thanks and regards,

CHETHAN KUMAR Y.B.

0 zhu paul over 3 years ago in reply to CHETHAN KUMAR Y.B.

Prodigy 10 points

Hello，

I follow your advice，and can program IWR1443BOOST successful。But I still cannot program my custom board with IWR6843AOP 。I find taht the voltage of SOP2 maybe not right。When I set SOP in flash mode（S1 is ON，S2 and S4 are off），the voltage of SOP2(V10) is 1.76V。

I woder if this caused program？Thanks。

Pictures below show the SOP schematic diagram and the voltage change of SOP2。

schematic

voltage change of SOP2

0 CHETHAN KUMAR Y.B. over 3 years ago in reply to zhu paul

TI__Mastermind 25835 points

Hello Zhu,

Thanks for the confirming that IWR1443BOOST working fine. However I couldn't understand how it's related to IWR6843AOP custom board.

Yes, It appears that there is some problem with SOP2 line. On the reference design we have option of PMIC_CLK connection to the SOP2 line.

We need to ensure this line is disconnected in your design. It could be possible R103 resistor could have been connected. Apart from this please review if any other lines are connected to SOP lines.

Thanks and regards,

CHETHAN KUMAR Y.B.

0 zhu paul over 3 years ago in reply to CHETHAN KUMAR Y.B.

Prodigy 10 points

Hi,

There is no other line connected to SOP2,could some hardware errors causeed this?Or what can I do more to find out more possibility about this?

0 zhu paul over 3 years ago in reply to CHETHAN KUMAR Y.B.

Prodigy 10 points

Hi,

I find it out ! The resistors used to connect QSPI flash need 33.2R,but I use 33.2k.After I change them,my board could be flashed and work fine.

Thanks for your patience and advice！

0 CHETHAN KUMAR Y.B. over 3 years ago in reply to zhu paul

TI__Mastermind 25835 points

Hello Zhu,

Thanks for the confirmation. Congratulation for finding out this issue. It's hard to debug such issues remotely, I'm glad you could able to figure this out so quickly and once again congratulation for able to flash it. All the best for your future work on this project.

Thanks and regards,

CHETHAN KUMAR Y.B.

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IWR6843AOP: Can not use external XDS110 flash IWR6843AOP with UART