Сcan't connect to debug and firmware nrf9160 SICA B0

[vasya]

Chip unresponsive voltage at DEC0 is 0.04v

Chip nrf9160 SICA B0

Transfer the ticket to private, I will send the PCB

[Håkon Alseth]

Hi,

 

Q1: How many boards has this problem, and how many has been produced?

Q2: Has the board been reworked (warmed up again) to see if the behavior changes then?

 

Kind regards,

Håkon

[vasya]

I solved the problem. It is necessary to poolup nReset output to plus voltage. I understand this problem only in revision B0

[Håkon Alseth]

A pull-up on the nRESET pin is not necessary, as there is one internally in the nRF. Could you check the voltage on the ENABLE pin to see if this is set high?

 

Kind regards,

Håkon

[vasya]

nRESET pin - 0.07 V
ENABLE contact - 3.26v I filed with nrf52840

[Håkon Alseth]

Could you answer the initial questions, given that the issue still occurs?

Håkon Alseth said:

Q1: How many boards has this problem, and how many has been produced?

Q2: Has the board been reworked (warmed up again) to see if the behavior changes then?

 

Kind regards,

Håkon

[vasya]

Q1: There were 3 boards made, there is a problem on all 3 boards
Q2: No. There on the bottom side nrf52840 so we did not warm up

[Håkon Alseth]

Hi,

 

Given that pulling the nRESET pin high makes the nRF9160 run, it can indicate a short or something pulling the pin low.

Have you checked the current consumption of the nRF? When both pulling nRESET to VDD, and when leaving the pin unconnected.

What is the VDD provided to the nRF9160?

 

Kind regards,

Håkon