AN3271

Push-button input glitch immunity

Doc ID 17933 Rev 2

11/29

5

Push-button input glitch immunity

A mechanical push-button connected to PB or SR input can produce a quite noisy signal

during switching. The STM660x ignores all the glitches and asserts an enable output (EN or

(typically 32 ms).

Figure 7.

Push-button noise immunity

PB and SR inputs are also equipped with high ESD protection of ±8 kV (human body

model).

32 ms (typ.)