qt401 Quantum Research Group, qt401 Datasheet - Page 10

• Manufacturer Part Number: qt401
• Description: Qslide? Touch Slider Ic
• Manufacturer: Quantum Research Group

4.1 Absolute Maximum Specifications
Operating temperature range, Ta. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40
Storage temperature range, Ts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55
V
Max continuous pin current, any control or drive pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20mA
Short circuit duration to ground, any pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . infinite
Short circuit duration to V
Voltage forced onto any pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.6V to (Vdd + 0.6) Volts
4.2 Recommended Operating Conditions
V
Supply ripple+noise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mV p-p max
Cs1, Cs2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22nF to 100nF
Cs1, Cs2 relative matching. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10%
Output load, max. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.5mA
4.3 DC Specifications
Vdd = 5.0V, Cs1 = Cs2 = 100nF, 100ms rep rate, Ta = recommended range, all unless otherwise noted
4.4 AC Specifications
Vdd = 5.0V, Cs1 = Cs2 = 100nF, Ta = recommended range, unless otherwise noted
4.5 Signal Processing and Output
lQ
DD
DD
Parameter
Parameter
Parameter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 to +7.0V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +2.5 to 5.0V
I
I
I
I
V
Fspi
DD
DD
DD
DD
V
V
V
Tbs
Fqt
Tqt
V
A
Sp
Ss
Td
Tr
DDS
I
Hp
OH
Tp
HL
OL
IL
DI
Ht
Dr
Tt
IL
L
R
5
3
5
3
P
P
A
A
Peak supply current
Peak supply current
Average supply current
Average supply current
Supply turn-on slope
Low input logic level
High input logic level
Low output voltage
High output voltage
Input leakage current
Acquisition resolution
Response time
Prox Sensitivity
Slide Sensitivity
Sample frequency
QT Pulse width
QT Burst spacing
Power-up delay to operate
SPI clock rate
Description
Detection integrator counts
Threshold, prox
Threshold, slider touch
Hysteresis, prox sensing
Hysteresis, touch sensing
Drift compensation rate
Position linearity
Description
Description
DD
, any pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . infinite
Vdd-0.7
Min
Min
0.15
100
500
2.2
0.6
1.8
75
5
Min
1
1
Typ
0.75
0.45
Typ
180
110
500
87
2
Typ
12.5
-
±3
1
0
10
Max
Max
100
1.5
0.6
0.8
0.6
2.4
±1
40
Max
7
±10
63
63
Units
Units
bits
mA
mA
V/s
µA
µA
µA
V
V
V
V
kHz
kHz
Units
counts
ms
ms
pF
pF
µs
µs
%
%
%
%
@ 5V
@ 3V
@ 5V
@ 3V
Required for proper startup and calibration
4mA sink
1mA source
Under host control
Variable parameter under host control
Variable parameter under host control
Modulated spread-spectrum (chirp)
Modulated spread-spectrum
Both prox and touch detection
Host controlled variable
Host controlled variable
% of threshold setting
% of threshold setting
% of bursts; host controlled
Depends on element linearity, layout
QT401 R10.04/0505
Notes
Notes
Notes
O
C to +125
O
C to +85
O
O
C
C