The nRF51822 is halted or hand_up frequently。Why？

[??]

Hello,this is Lee.I have a problem about nRF51822. When I turn on/off the power 2.8V to it ,it hangs up frequently.I check POR function,I found that the residual voltage (VDD) decreases slowly and stop at 0.5V.I doubt that
the residual voltage (VDD=0.5) cause nRF51822 not to be reseted and hangup.

when the VDD powers on angain,POR doesn't function and nRF51822 isn't running.

I don't know why? 1,the residual voltage(VDD=0.5)? 2,the power's noise? What is the casue of the nRF51822's halted (or hang_up)?

my contact:[email protected] Eng.Lee

[bjorn-spockeli]

Are you measuring 0.5V on the VDD pin of the nRF51822 when you have turned off the power?

[??]

Yes，it is so。CSCS7546-V3.pdfMCP1640T-I.pdf I turn off U1 （MCP1640T , DCUP charger),but the VDD drops to 0.5V .（There are some leak current in our board。） then I turn on U1 again,the VDD return to 2.8V，but the nRF51822 can't resume running。

I have some analysises： 1，Does the residual voltage (VDD=0.5) cause that the NRF51822 isn't be resetted completely? 2, Does the MCP1640T 's switching noise casue that the NRF51822 hangs up?

What is your idea？

QWE Lee

[bjorn-spockeli]

I kindly ask you to create a support case in our Mypage system so that we can follow-up this more closely and investigate this further. Please attach schematics in the Mypage case and provide the chip markings of the nRF51822 IC in the description.

[Karsten]

Hello, I think we ran into the same problem with our system. Is there any official/public information about this situation yet?

There is two more reports which seem to hint at the same problem: devzone.nordicsemi.com/.../ devzone.nordicsemi.com/.../

We are using the N5150M8CD module from dynastream with a N51422 IC, thus have no access to DEC1 and DEC2, and no knowledge about the layout on the module. We could provide our layout and schematics up and to the module, but the rest would be up to Dynastream.

Thanks for your support! Karsten

[bjorn-spockeli]

Hi Karsten, I kindly ask you to create a support case in our Mypage system so that we can follow-up this more closely. Please refer to this questions in your support ticket.