RT1050: DCDC_PSWITCH delay

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RT1050: DCDC_PSWITCH delay

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jess1
Contributor I

In all the documentation made available for the RT1050, nowhere can a specification for the pin: DCDC_PSWITCH be found.

In order to calculate a delay filter for the pin to meet the criteria at least 1ms, a trigger level for the pin is needed.

It is in the DCDC_IN domain, but a specification for this domain seems unavailable.

Is it reasonable to assume it is 0.7*VCC?

From ref design:

VCC=3.3V

V-PSWITCH=0.7*3.3V

R=30K

C=220nF

Tau=7.95ms

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jamesbone
NXP TechSupport
NXP TechSupport

Hello Jes,

You are fine, the PSWITH it is just like the Power On Switch for the DCDC to start working so it is attach to the same power rail, of the main supply for the DCDC, which means that you are correct assuming the 0.7*VCC

Hope this clarifies.

Jaime

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