Datasheet

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ELECTRICAL CHARACTERISTICS
TSC2005
SBAS379C – DECEMBER 2006 – REVISED MARCH 2008
At T
A
= – 40 ° C to +85 ° C, SNSVDD = V
REF
= +1.6V to +3.6V, I/OVDD = +1.2V to +3.6V, unless otherwise noted.
TSC2005
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
AUXILIARY ANALOG INPUT
Input voltage range 0 VREF V
Input capacitance 12 pF
Input leakage current – 1 +1 µ A
A/D CONVERTER
Resolution Programmable: 10 or 12 bits 12 Bits
No missing codes 12-bit resolution 11 Bits
Integral linearity 1.5 LSB
(1)
SNSVDD = 1.6V, V
REF
= 1.6V – 0.8 to +0.3 LSB
Offset error
SNSVDD = 3.0V, V
REF
= 2.5V +3.2 to +8.9 LSB
SNSVDD = 1.6V, V
REF
= 1.6V – 0.2 to 0 LSB
Gain error
SNSVDD = 3.0V, V
REF
= 2.5V +3.8 to +4.4 LSB
REFERENCE INPUT
V
REF
range 1.6 SNSVDD V
Non-continuous AUX mode, SNSVDD = 3V, V
REF
= 2.5V,
VREF input current drain 5.6 µ A
T
A
= +25 ° C, f
ADC
= 2MHz, f
SCLK
= 10MHz
Input impedance A/D converter not converting 1 G Ω
TOUCH SENSORS
PENIRQ 50k Ω pull-up resistor,
T
A
= +25 ° C, SNSVDD = 3V, V
REF
= 2.5V 51 k Ω
R
IRQ
Y+, X+ 6 Ω
Switch
on-resistance
Y – , X – 5 Ω
Switch drivers drive current
(2)
100ms duration 50 mA
TEMPERATURE MEASUREMENT
Temperature range – 40 +85 ° C
Differential method
(3)
, SNSVDD = 3V V
REF
= 2.5V 1.6 ° C/LSB
Resolution
TEMP1
(4)
, SNSVDD = 3V V
REF
= 2.5V 0.3 ° C/LSB
Differential method
(3)
, SNSVDD = 3V V
REF
= 2.5V ± 2 ° C/LSB
Accuracy
TEMP1
(4)
, SNSVDD = 3V V
REF
= 2.5V ± 3 ° C/LSB
INTERNAL OSCILLATOR
SNSVDD = 1.6V 3.6 MHz
Clock frequency, f
OSC
SNSVDD = 3.0V 3.8 MHz
SNSVDD = 1.6V 0.0056 %/ ° C
Frequency drift
SNSVDD = 3.0V 0.012 %/ ° C
(1) LSB means Least Significant Bit. With V
REF
= +2.5V, one LSB is 610 µ V.
(2) Assured by design, but not tested. Exceeding 50mA source current may result in device degradation.
(3) Difference between TEMP1 and TEMP2 measurement; no calibration necessary.
(4) Temperature drift is – 2.1mV/ ° C.
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