Adverting event, current is big

RE: Adverting event, current is big

zcmm — Thu, 20 Apr 2017 07:20:44 GMT

1uf--4.7uf is same as before.it is ok when the capacitor >10uf.Can i use 47uf,have influence?for exmaple battery Use capacity/battery use time and so on

RE: Adverting event, current is big

Kenneth — Tue, 16 Feb 2016 10:37:00 GMT

I expect this to be a short current spike of few us when internal regulators and internal circuitry power ON. This should easily be handled by adding 1uF to 4.7uF decoupling capacitor on VDD, the current may be high, but the time is very short. For instance the 47nF capacitor on DEC2 needs to be charged when powering ON, so you need some decoupling on VDD to handle this. If that doesn't work, please share the schematic so we can take a closer look.

RE: Adverting event, current is big

Susheel Nuguru — Tue, 02 Feb 2016 06:42:51 GMT

Only thing i can think of is the RC calibration like you mentioned, but that should not happen with every advertising event.

RE: Adverting event, current is big

Dave_couling — Mon, 01 Feb 2016 22:58:50 GMT

I have started seeing this issue with the rev 3 Silicon chips. I do not use an external LDO. I run in internal LDO mode. At the rising edge of pre-processing during any RF event I see 19.5mA current spikes. I haven't been able to determine root cause yet. Any update on this?

RE: Adverting event, current is big

Susheel Nuguru — Wed, 13 Jan 2016 08:20:33 GMT

This is interesting, Agree with Dave's comment. Any updates from you zcmm?

RE: Adverting event, current is big

Dave_couling — Tue, 29 Dec 2015 19:14:48 GMT

I have seen something like this back when I worked with a CC2540. It was the DCDC circuit switching on, cause a fast voltage different and thus current rush. If you say you're not using the DCDC perhaps its related to RC Calibration? Though you should see peaks this high.