IWR1642: I can't download flash in IWR1642.

Hi,

Can you please provide some more information about the issue? There is no way to say why its happening with the available information

• using an oscilloscope can you confirm that the SOP lines are settling at 3V3 before nreset crosses 1v5?
• What is the difference between the working and failing board?

BR,

Charles O

Level of SOP2 & NRESET are 3V3.

There is no difference between working board and failing board 

The two boards are circuitly same board.

I only saw this on boards with IWR1642.

I haven't seen it in XWR1243, XWR1443, XWR6843 and AWR1642.

Of course I used the IWR1642 the most, but I haven't seen any other chips firmware download yet.

Hi,

Can you confirm silicon version of the various boards?

http://dev.ti.com/tirex/explore/node?node=ADsPyX6E2a-akoJpFzxp2A__VLyFKFf__LATEST

Also are these custom boards or EVMs?

Charles O

Hi,

I confirmed that the silicone version of the IWR1642 is ES2.0.

All the boards I have mentioned are boards designed by myself.

 I've also taken X-rays, but there weren't any problems.

Hi,

It appears to be some system level issue that requires troubleshooting. Using the checklist can you please troubleshoot the board?

Charles O

Hi.

I checked the checklist you gave up to TEST3, and everything was normal.

Since TEST4, it has not progressed as a UART problem, and as I said, the RS232_RX pin is fixed low.

So I tried to operate it in Function mode after modifying the flash memory where the firmware was downloaded.

The result was that the RS232_TX pin worked, but the RS232_RX pin still did not move.

Not all chips are like that, but I'd like to see why this often happens.

If you need to check more, please comment.

1. After setting SOP to flashing mode, do you power cycle the board and then hit reset?
2. Using an osciloscope can you confirm that the SOP lines get to steady state at 3V3 before reset line crosses 1V5?

Yellow : VAR_IO (3.3V output of LP87524B-Q1)

Green : PWR_EN1 (EN1 pin of LP87524B-Q1

Blue : NRESET (NRESET pin of IWR1642)

RED : SOP2 (Default value(Function Mode) - SOP2 SOP1 SOP0 = 0 0 1 / Flash Mode = 1 0 1)

Hi,

The oscilloscope capture shows not problem. Can you ABBA swap of the IC to confirm if the issue is tracking the board or IC?

Regards,

Charles O