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
End of touchms25Release time - all modesTdr
200ms LP settingms200Response time - LP modeTdl
ms25Response time - Normal modeTdn
ms10Response time - Fast modeTdf
Both bursts togetherms3.4Burst durationTbd
ms350Start-up time from cold startTsu
µs2Sample pulse durationTpc
Total deviation%15Burst modulation, percentFm
kHz132Burst center frequencyFc
ms150Recalibration timeTrc
NotesUnitsMaxTypMinDescriptionParameter
4.4 DC Specifications
Vdd = 5.0, Ta = recommended, Cx = 5pF, Cs = 4.7nF; circuit of Figure 1.1 unless noted
bits8Acquisition resolutionA
R
µA±1Input leakage currentI
IL
2.5mA sourceVVdd-0.5High output voltageV
OH
7mA sinkV0.5Low output voltageV
OL
V3.5High input logic levelV
HL
V0.7Low input logic levelV
IL
Required for start-up, w/o external reset
circuit
V/s100Average supply turn-on slopeV
DDS
@ Vdd = 3.0; 360ms LP modeµA45Average supply current, LP mode*I
DDL
@ Vdd = 5.0
@ Vdd = 4.0
@ Vdd = 3.6
@ Vdd = 3.3
@ Vdd = 3.0
@ Vdd = 2.8
mA84.5
2.7
2.2
1.8
1.5
1.3
Average supply current,
normal mode*
I
DDN
NotesUnitsMaxTypMinDescriptionParameter
*No spread spectrum circuit; Rosc = 18KΩ
ΩΩ
Ω
4.5 Signal Processing
Vdd = 5.0, Ta = recommended, Cx = 5pF, Cs = 4.7nF
Towards decreasing Cx loadms/level500Anti-drift compensation rate
Towards increasing Cx loadms/level2,000Normal drift compensation rate
Option pin selectedsecs10, 60, ∞Max On-Duration
Must be consecutive or detection failssamples2Detect Integrator filter, ‘fast’ mode
Must be consecutive or detection failssamples6Detect Integrator filter, normal mode
Time to recalibrate if Cx load has exceeded anti-detection thresholdsecs2Anti-detection recalibration delay
Threshold for decrease of Cx loadcounts6Anti-detection threshold
counts2Detection hysteresis
Threshold for increase in Cx loadcounts10Detection threshold
NotesUnitsValueDescription
lQ
10 QT1080 R11.06/0806
