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Chapter 7 AC Zero-Cross Circuit/Noise Filter
P21/IRQ1/SENS
122
Overview
7-1 Overview
The P21/SENS pin is the input pin for the AC zero-cross detection circuit.
The AC zero-cross detection circuit outputs a high level when the input is at
an intermediate level, and a low level at all other times.
AC zero-cross
detection circuit
Figure 7-1-1 P21 Input Circuit Block Diagram
FLOAT1
0
P7RDWN
PARDWN
P21IM
–
–
–
–
–
7
MUX
P21 input/IRQ1
to noise filter
(See figure 7-3-1.)
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