Datasheet

To ensure the pulse is detected it must be present for typical times as shown in Table 3-6.
Table 3-6. Time Delay Pulse
Pulse Duration Action
tp – series of short pulses, typically 65 ms “Sustain”/retrigger (reload auto-off delay counter)
tp – long pulse, typically 250 ms “Cancel”/switch output to off state and inhibit further touch
detection until Vm returns to original state
While Vm is held in the override state the QT1012 inhibits bursts and waits for Vm to return to its original
state. When Vm returns to its original state the QT1012 performs a sensor recalibration before continuing
in its current output state.
Figure 3-11. Override Pulse (Delay Multiplier x1)
VDD
OUT
VSS
2
1
4
SNS
Rm
Vm
TIME
6
3
SNSK
Cs
SENSE
ELECTRODE
Rs
Rop
5
VDD
Cby
100 nF
Vdd
Vss
Tp
AT42QT1012
© 2017 Microchip Technology Inc.
Datasheet
DS40001948A-page 19