PPK crash

[jtredez]

Hi,

I try to use the PPK to measure the current on my custom firmware.

The material:

PCA10028 (V1.1.0) with PCA63511 (rev 1.0.0 and rev 1.1.0) and nRF Connect V2.4.0 (windows 10 x64).

The device I would like to measure it's a keyfob with nRF51822 (connected to P16), normaly this device is powered by a CR2032.

PCA63511 switch configuration : SW2=External, SW4=Reg, COM=DK

To verify the output of the PPK I replace the keyfob by a multimeter (FLUKE 175) on P16.

Some trouble I have (tested with the two PCA63511 I have):

1. Below 2V the output stay to the previous value. Exemple, set the output to 3600mV and after set it to 1850mV: the output stay to 3.6V
2. The output is not accurate: set 2713mV=out give me 2550mV (3.6V is OK, I get 3.599)
3. If you move to many time the cursor, the output is not correct (I set it to 3168mV and the output equal 2294mV) (without a command failed message)
4. I get alot of "PPK command failed", with "PPK connection failure

Best regards

[haakonsh]

Have you cut the solder bridge next to the debug port?

Have you tried using the nRF52DK?

[jtredez]

I doesn't cut a bridge.

I test with a PCA10040 (V1.2.1) but same result, impossible to go under 2V and "PPK command failed" if I move the curser to fast.

I found moving the cursor fast doesn't take the last value. If I move the cursor too many times I have the command failed message.

[haakonsh]

you need to cut the 'SB9' solder bridge.

[jtredez]

Cut SB9 provide less PPK command failed when I move the slider slowly. But for the rest it's the same.

I switched to a keysight multimeter with μA caliber for my measurements.

[haakonsh]

I'll try to replicate your issues on my end and pass it on to the developers.