4 Specifications
4.1 Absolute Maximum Specifications
Operating temperature, Ta. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 ~ +85ºC
Storage temp, Ts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -50ºC ~ +125ºC
Vdd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 ~ +6.0V
Max continuous pin current, any control or drive pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20mA
Short circuit duration to ground or Vdd, any pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . infinite
Voltage forced onto any pin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V ~ (Vdd + 0.3) Volts
4.2 Recommended Operating Conditions
Operating temperature, Ta. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 ~ +85ºC
V
DD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +2.8 ~ +5.0V
Short-term supply ripple+noise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±5mV/s
Long-term supply stability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±100mV
Cs range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2nF ~ 100nF
Cx range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 ~ 50pF
4.3 AC Specifications
Vdd = 5.0, Ta = recommended, Cx = 5pF, Cs = 4.7nF; circuit of Figure 1.1
Parameter Description
Min
Typ
Max
Units
Notes
Trc
Fc
Recalibration time
150
132
15
ms
kHz
%
Burst center frequency
Burst modulation, percent
Sample pulse duration
Start-up time from cold start
Burst duration
Fm
Tpc
Tsu
Tbd
Tdf
Tdn
Tdl
Tdr
Total deviation
2
µs
350
3.4
10
ms
ms
ms
ms
ms
ms
Both bursts together
Response time - Fast mode
Response time - Normal mode
Response time - LP mode
Release time - all modes
25
200
25
200ms LP setting
End of touch
4.4 DC Specifications
Vdd = 5.0, Ta = recommended, Cx = 5pF, Cs = 4.7nF; circuit of Figure 1.1 unless noted
Parameter Description
Min
Typ
Max
Units
Notes
IDDN
Average supply current,
normal mode*
4.5
2.7
2.2
1.8
1.5
1.3
8
mA
@ Vdd = 5.0
@ Vdd = 4.0
@ Vdd = 3.6
@ Vdd = 3.3
@ Vdd = 3.0
@ Vdd = 2.8
I
DDL
Average supply current, LP mode*
Average supply turn-on slope
45
µA
@ Vdd = 3.0; 360ms LP mode
V
DDS
100
V/s
Required for start-up, w/o external reset
circuit
V
IL
Low input logic level
High input logic level
Low output voltage
High output voltage
Input leakage current
Acquisition resolution
0.7
0.5
±1
V
V
V
HL
3.5
V
OL
V
7mA sink
V
OH
IL
Vdd-0.5
V
2.5mA source
I
µA
bits
A
R
8
*No spread spectrum circuit; Rosc = 18KΩ
4.5 Signal Processing
Vdd = 5.0, Ta = recommended, Cx = 5pF, Cs = 4.7nF
Description
Value
Units
Notes
Detection threshold
10
counts
counts
counts
secs
Threshold for increase in Cx load
Detection hysteresis
2
Anti-detection threshold
6
Threshold for decrease of Cx load
Time to recalibrate if Cx load has exceeded anti-detection threshold
Must be consecutive or detection fails
Must be consecutive or detection fails
Option pin selected
Anti-detection recalibration delay
Detect Integrator filter, normal mode
Detect Integrator filter, ‘fast’ mode
Max On-Duration
2
6
samples
samples
secs
2
10, 60, ∞
2,000
500
Normal drift compensation rate
Anti-drift compensation rate
ms/level
ms/level
Towards increasing Cx load
Towards decreasing Cx load
lQ
10
QT1080 R11.06/0806
QUANTUM [ QUANTUM RESEARCH GROUP ]
