NRF51822 CURRENT is anormal

[zcmm]

Hi, SDK:8.1.0 Chip:nrf51822 Power Mode:LDO Battery:CR2450 Application:beacon

The equipment static power consumption is 3.3 ua, after a period of time is 1.9 ma,but the chip can work anormal.So i change the chip,it is restore 3.3ua. But my device Schematic diagram is a little different for the QFAA QFN48 schematic with internal LDO setup(nRF51822_PS_V3.1).The difference is as follows: C9:100nf

After i change the new C9,the current is 300ua,but it can not back to 3.3ua.

Why?

[Roger Clark]

Sounds like you board is entering debug mode.

Do you have a pull-down resistor on the SWCLK pin ?

Note. I think this issue was supposed to be fixed in newer versions of nRF51822 but most people prefer to still add the 10k pulldown to their circuit, just in case.

[zcmm]

i use the 680R pulldown.if it is entering debug mode,the device should not advtise.

[Ole Bauck]

Most of the code will run as normal in debug mode, so that your code is advertising does not mean it is not in debug mode. If you power cycle the chip does the problem disappear?

[zcmm]

No,Even if the electricity again, the problem still exists

[Ole Bauck]

Is the current draw stable or does it change if you for example touch the chip with your finger. If it changes it may indicate that something is floating.

If you look at the current draw using a power analyzer or an oscilloscope, is it constantly 1.9mA or 300uA, or does it change over time?