nRF52832 cannot programmed

RE: nRF52832 cannot programmed

user2115 — Tue, 24 May 2022 08:31:57 GMT

Glad to hear that you handled the issue. Please contact us if this is a recurring problem.

Hope you have a wonderful day!

Kind regards,

Håkon

RE: nRF52832 cannot programmed

user82895 — Tue, 24 May 2022 01:35:24 GMT

Sorry for late reply. Our team have no idea about this problem and replace the bad chip. 🙂

RE: nRF52832 cannot programmed

user2115 — Fri, 11 Feb 2022 14:00:23 GMT

Hi,

[quote user="ndc_bee"]The voltage is normal, the ripple test and noise test are also ok.[/quote]

I agree, this looks well within.

[quote user="ndc_bee"]The nRF52832 on the device has several GPIOs connected to the core board. Could it be that the GPIOs of the core board output high current or high voltage and damage the nRF52832 chip? Because from the waveform of the SWD data line captured by the oscilloscope, the SWDIO signal on the bad device seems to be abnormal.[/quote]

Potentially, if there are two outputs (ie. nRF low, core board high), you can potentially damage the device over time. However, this should show up if you check the current of the bad board vs. a good board. I also see that the nRESET pin is routed, is this controlled by the external core board? If so, you could try to check if this pin is ever pulled low externally.

When you mention the waveform, I assume it is this section in red that you are worried about:

It is hard to say if this is noise, or if the nRF keeps the line low. Do you have a log from the programming/recovery sequence?

Kind regards,

Håkon

RE: nRF52832 cannot programmed

user82895 — Fri, 11 Feb 2022 01:38:56 GMT

Hellow Håkon

thank you for your reply, the answers to your questions is as follows

[quote userid="2115" url="~/f/nordic-q-a/84607/nrf52832-cannot-programmed/352405#352405"]Please correct me if I am mistaken, but it seems as the swap-test is failing for both "good" and "bad" device in this scenario.[/quote]

Yes, a bad device seems to cause chip damage, even if solder a good nRF52832 chip to the bad device, it cannot be programmed (there is also a chip that can be programmed once, but cannot be programmed later).

[quote userid="2115" url="~/f/nordic-q-a/84607/nrf52832-cannot-programmed/352405#352405"]Q1: Has the board(s) been checked to see if voltages are in order?[/quote]

The voltage is normal, the ripple test and noise test are also ok.

[quote userid="2115" url="~/f/nordic-q-a/84607/nrf52832-cannot-programmed/352405#352405"]Q2: How many devices are failing in total? And how many are produced in total?[/quote]

sample total: 50 PCS

bad sample: 13 PCS

The nRF52832 on the device has several GPIOs connected to the core board. Could it be that the GPIOs of the core board output high current or high voltage and damage the nRF52832 chip? Because from the waveform of the SWD data line captured by the oscilloscope, the SWDIO signal on the bad device seems to be abnormal.

thanks

RE: nRF52832 cannot programmed

user2115 — Thu, 10 Feb 2022 15:54:25 GMT

Hi,

[quote user=""]

The nRF52832 chip on a normal device can be programmed repeatedly
Solder the nRF52832 chip of the problematic device to the normal device, it cannot be programmed
Solder the nRF52832 chip of the normal device to the problematic device, and it can be programmed in the first few times, but it cannot be programmed after a long time of power-on, and the nRF52832 chip can not be programmed after soldering the it back to the normal device again.
Use the 3.3V power supply of the problem device to power the nRF52832 chip of the normal device, and it can be programmed normally
There is a faulty device that cannot be programmed again after being programmed for the first time, but the chip can work normally

[/quote]

Please correct me if I am mistaken, but it seems as the swap-test is failing for both "good" and "bad" device in this scenario.

Q1: Has the board(s) been checked to see if voltages are in order?

Q2: How many devices are failing in total? And how many are produced in total?

Kind regards,

Håkon