16
QT113B [DATASHEET]
9525D–AT42–05/2013
5. Specifications
5.1 Absolute Maximum Specifications
5.2 Recommended Operating Conditions
5.3 DC Specifications
Vdd = 3.0 V, C
S
= 10 nF, C
X
= 5 pF; Ta = recommended range, unless otherwise noted
Vdd –0.5 V to +6.0 V
Max continuous pin current, any control or drive pin ±40 mA
Short circuit duration to ground, any pin infinite
Short circuit duration to Vdd, any pin infinite
Voltage forced onto any pin –0.6 V to (Vdd +0.6) V
CAUTION: Stresses beyond those listed under Absolute Maximum Specifications may cause permanent damage to
the device. This is a stress rating only and functional operation of the device at these or other conditions beyond those
indicated in the operational sections of this specification is not implied. Exposure to absolute maximum specification
conditions for extended periods may affect device reliability
Operating temp –40°C to +85°C
Storage temp –55°C to +125°C
Vdd +2.45 V to 5.5 V
Short-term supply ripple + noise ±5 mV p-p max
Long-term supply stability ±100 mV
C
S
value 10 nF to 500 nF
C
X
transverse load capacitance per channel 0 to 100 pF
Parameter Description Min Typ Max Units Notes
Idd Supply current 1.0 2.5 mA
Vdds Supply turn-on slope 100 V/s
Required for proper
startup
Vil Low input logic level 0.2 × Vdd V OPT1, OPT2
Vhl High input logic level 0.9 × Vdd V OPT1, OPT2
Vol Low output voltage 0.6 V OUT, 4 mA sink
Voh High output voltage Vdd – 0.7 V OUT, 1 mA source
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QT113B [DATASHEET]
9525D–AT42–05/2013
5.4 Timing Specification
Iil Input leakage current ±1 µA OPT1, OPT2
Ar Acquisition resolution 9 14 bits
S Sensitivity range
(1)
1,000 10 fF See Note
1. Sensitivity depends on value of C
X
and C
S
. Refer to Figures 4-1, 4-2
Parameter Description Min Typ Max Units Notes
TRC Recalibration time 330 ms C
S
, C
X
dependent
Tpc Charge-transfer duration 1.95 µs
Tpt C
X
reset duration 2.9 µs
Tbs Burst spacing interval 4.9 156 ms C
S
= 10nF to 500nF; C
X
= 0
Tbl Burst length 3.1 154 ms C
S
= 10nF to 500nF; C
X
= 0
Tr Response time 30 ms C
X
= 10pF; See Figure 5-3
Thb Heartbeat pulse width 310 µs
Fq Burst frequency 172 kHz
Parameter Description Min Typ Max Units Notes
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QT113B [DATASHEET]
9525D–AT42–05/2013
5.5 Signal Processing
Figure 5-1. Typical Threshold Sensitivity against. C
X
, High Gain, at Selected Values of C
S
; Vdd = 3.0 V
Figure 5-2. Typical Threshold Sensitivity against C
X
, Low Gain, at Selected Values of C
S
; Vdd = 3.0 V
Description Min Typ Max Units Notes
Threshold differential 6 or 12 counts Option pin selected
Hysteresis 17 % Percentage of signal threshold
Consensus filter length 3 samples
Positive drift compensation rate 1000 ms/level
Negative drift compensation rate 100 ms/level
Post-detection recalibration timer duration 10 60 infinite s Option pin selected
10
1
0.1
0.01
0.001
Cs = 10 nF
Cs = 20 nF
Cs = 50 nF
Cs = 100 nF
Cs = 200 nF
Cs = 500 nF
Detection Threshold pF
0
10
20 30
40
Cx Load (pF)
10
1
0.1
0.01
0.001
Cs = 10 nF
Cs = 20 nF
Cs = 50 nF
Cs = 100 nF
Cs = 200 nF
Cs = 500 nF
Detection Threshold pF
0
10
20 30
40
Cx Load (pF)

QT113B-ISG

Mfr. #:
Manufacturer:
Microchip Technology / Atmel
Description:
Capacitive Touch Sensors INTEGRATED-CIRCUIT
Lifecycle:
New from this manufacturer.
Delivery:
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