AT42QT1012_10 ATMEL [ATMEL Corporation], AT42QT1012_10 Datasheet - Page 12

• Manufacturer Part Number: AT42QT1012_10
• Description: One-channel Toggle-mode Touch Sensor IC with Power Management Functions
• Manufacturer: ATMEL [ATMEL Corporation]

3.11.3
12
AT42QT1012
Auto Off – User-programmed Delay
Figure 3-6.
Table 3-2.
Table 3-3.
Table 3-4.
If a user-programmed delay is required, a RC network (resistor and capacitor) can be used to
set the auto-off delay (see
dependent on the RC time constant (Rt x Ct), the output polarity and the supply voltage.
Section 3.11.4 on page 13
delay times ranging from minutes to hours.
OUT
OUT
Vdd
Vdd
Vdd
Vss
Vss
Vss
Vm
Vt
Vt
Predefined Delay
Predefined Auto-off Delay (Active High Output)
Predefined Auto-off Delay (Active Low Output)
Auto-off Delay Multiplier
Auto-off Delay (t
Infinity (remain on until toggled to off)
15 minutes
60 minutes
Auto-off Delay (t
15 minutes
Infinity (remain on until toggled to off)
60 minutes
Auto-off Delay Multiplier
t
t
o
o
x 1
x 24
ELECTRODE
Table 3-5 on page 13
gives full details of how to configure the QT1012 to have auto-off
SENSE
Vm
o
o
RS
CS
Rm
)
)
3
4
SNS
SNSK
VDD
VDD
VSS
5
2
TIME
OUT
and
Cby
100 nF
1
6
Figure 3-7 on page
Vt
Rop
13). The delay time is
9543D–AT42–08/10