MC33772B wake up by CSB

shiqi_seventeen — Thu, 04 Jul 2024 01:19:40 GMT

Hello, team.

I am currently using MC33772B and have encountered a problem. I can put the MC33772B into sleep mode, but I am having trouble waking it up using the CSB pin. I followed the manual and changed the CSB pin from low to high, but the MC33772B remains in sleep mode and is not waking up.

shiqi_seventeen_0-1720055967096.png

I was wondering if there's something I've missed or if I'm operating it incorrectly. Could you please help me with this?

Re: MC33772B wake up by CSB

guoweisun — Tue, 09 Jul 2024 06:50:24 GMT

The tWAKE-UP time starts after a valid CSB wake-up pulse, so indeed it does not include the 65µs CSB wake-up de-glitch filter timing.

As for the minimum low pulse width, there is no requirement here.

In order for a CSB wake-up to be detected, there must only be a rising edge and a long enough logic 1 level.

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MC33772B wake up by CSB

Re: MC33772B wake up by CSB