AT42QT1012-TSHR Atmel, AT42QT1012-TSHR Datasheet - Page 16

• Manufacturer Part Number: AT42QT1012-TSHR
• Description: IC TOUCH SENSOR 1KEY SOT23-6
• Manufacturer: Atmel
• Series: QTouch™r
• Type: Capacitiver

Specifications of AT42QT1012-TSHR

• Touch Panel Interface: 1, 2-Wire
• Number Of Inputs/keys: 1 Key
• Resolution (bits): 9, 14 b
• Data Interface: Serial
• Voltage Reference: Internal
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Output Type: Logic
• Interface: Digital
• Input Type: Logic
• Supply Voltage: 1.8 V to 5.5 V
• Dimensions: 2.9 mm L x 1.6 mm W x 1.45 mm H
• Output Voltage: 0.6 V to 0.7 V
• Temperature Range: - 40 C to + 85 C
• Termination Style: SMD/SMT
• Supply Current: 31.5µA
• Supply Voltage Range: 1.8V To 5.5V
• Sensor Case Style: SOT-23
• No. Of Pins: 6
• Operating Temperature Range: -40°C To +85°C
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: AT42QT1012-TSHRTR

16
AT42QT1012
Example using a chart to calculate Rt and Ct
Requirements:
Figure 3-10. Auto-off Delay, Active Low Output
• Active low output (Vop connected to VSS)
• Auto-off delay 25 minutes
• VDD = 4V
1. Calculate Auto-off delay in seconds 25 x 60 = 1500.
2. Find
3. This shows the following suitable Ct / Rt combinations:
4000
3500
3000
2500
2000
1500
1000
3500
3000
2500
2000
1500
1000
500
500
0
0
– 100 nF / 20 k
– 47 nF / 40 k
– 22 nF / 90 k
– 10 nF / 190 k
Note: the Auto-off delay times shown are nominal and will vary from chip to chip and with
capacitor and resistor tolerance.
0
0
Ct = 100nF
Ct = 100nF
1500
------------ -
50
50
1
Vm = Vss (delay multiplier = x1)
= 1500 on the 4V chart in
Timing Resistor Rt (K ohms)
Timing Resistor Rt (K ohms)
5V Active Low
3V Active Low
100
100
Ct = 47nF
Ct = 47nF
150
150
200
200
Ct = 22nF
Ct = 10nF
Ct = 22nF
Ct = 10nF
Figure
250
250
4000
3500
3000
2500
2000
1500
1000
3500
3000
2500
2000
1500
1000
3-10.
500
500
0
0
0
0
Ct = 100nF
Ct = 100nF
50
50
Ct = 47nF
Timing Resistor Rt (K ohms)
Timing Resistor Rt (K ohms)
4V Active Low
2V Active Low
100
100
Ct = 47nF
150
150
9543D–AT42–08/10
200
200
Ct = 22nF
Ct = 22nF
Ct = 10nF
Ct = 10nF
250
250