LPC11C14 - problems during the switch on phase

Discussion created by lpcware Employee on Jun 15, 2016
Content originally posted in LPCWare by mattiad on Thu Oct 16 05:40:36 MST 2014
Hi everyone,

I'm having some problems during the switching on phase of a LPC11C14 microprocessor.
In my context I supply the micro with 3.3V but I have a supply voltage that has a long rise time (caused by the kind of supplying devices).
RESET pin is connected in a "classical" way in a RC filter which is connected to the supply voltage (see the picture attached).
Sometimes the delay caused by the RC is not enough and the micro exits from the reset mode too early and the micro results totally blocked.

To solve this problem without an hardware modification I wolud like to put an additional delay in the reset port, for example of 200/300 ms.
I mean: if the reset port sense the logic state 1, it give the command to exit from the reset only 300 ms later.

Thank you in advance,