qt100a Quantum Research Group, qt100a Datasheet - Page 7

• Manufacturer Part Number: qt100a
• Description: Charge-transfer Qtouch? Ic
• Manufacturer: Quantum Research Group

4 Specifications
4.1 Absolute Maximum Specifications
Operating temp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40
Storage temp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55
V
Max continuous pin current, any control or drive pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20mA
Short circuit duration to V
Short circuit duration to V
Voltage forced onto any pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.6V to (V
4.2 Recommended Operating Conditions
V
Short-term supply ripple+noise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5mV
Long-term supply stability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±100mV
Cs value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2nF to 50nF
Cx value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 to 50pF
4.3 AC Specifications
V
4.4 Signal Processing
Note1: These threshold and hysteresis values exactly match the performance of the QT100.
.

Parameter
Description
Threshold differential
Hysteresis
Consensus filter length
Max on-duration
DD
DD
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +6.0V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +2.0 to 5.5V
= 3.0V, Cs = 10nF, Cx = 5pF, Ta = recommended range, unless otherwise noted
T
T
T
T
T
T
T
T
RC
PC
G
G
HB
PT
BL
R
1
2
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.
Description
Recalibration time
Charge duration
Transfer duration
Time between end of burst and
start of the next (Fast mode)
Time between end of burst and
start of the next (LP mode)
Burst length
Response time
Heartbeat pulse width
SS
DD
, any pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . infinite
, any pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . infinite
Min
Min
Typ
Typ
250
85
20
15
13
80
2
2
1
3
4
7
Max
Max
100
samples
Units
Units
counts
counts
secs
ms
ms
ms
ms
ms
µs
µs
µs
Notes
Cs, Cx dependent
±7.5% spread spectrum variation
±7.5% spread spectrum variation
Increases with decreasing V
Vdd, Cs and Cx dependent
Notes
See Note 1
See Note 1
Will vary in SYNC mode, and with V
 
C opyright © 2008 QRG Ltd.
QT100A_1R7.01_0308
DD
DD
O
C to +125
O
+ 0.6) Volts
C to +85
DD
O
O
C
C