Production Data
WM9715L
TOUCHPANEL AND AUXILIARY ADC
Test Conditions
DBVDD=3.3V, DCVDD = 3.3V, AVDD = TPVDD = 3.3V, TA = +25oC, MCLK = 24.576 MHz, unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input Pins X+, X-, Y+, Y-, WIPER/AUX4, COMP1/AUX1, COMP2/AUX2 and BMON/AUX3
Input Voltage
AGND
-0.99
AVDD
V
Input leakage current
AUX pin not selected as
AUX ADC input
<10
nA
ADC Resolution
12
bits
LSB
LSB
LSB
LSB
dB
Differential Non-Linearity Error
Integral Non-Linearity Error
Offset Error
DNL
INL
0.15
+1.75
3
4
8
Gain Error
Power Supply Rejection
Switch matrix resistance
Programmable Pull-up resistor
Pen down detector threshold
Pressure measurement current
PSRR
RPU
IP
50
10
Ω
kΩ
RPU = 000001
63
68
73
VDD/2
400
200
V
PIL = 1
PIL = 0
µA
BMON/AUX3 (pin 31 only)
Input Range
AVDD = 3.3V
AVDD = 1.8V
AGND
AGND
-3%
5
V
V
3.3
Scaling
1/3
30
+3%
Input Resistance (Note 1)
during measurement
average over time
kΩ
30 /
duty cycle
Note:
1. Current only flows into pin 31 during a measurement. At all other times, BMON/AUX3 is effectively an open circuit.
COMPARATORS
Test Conditions
AVDD = 3.3V, TA = +25oC, unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
COMP1/AUX1 and COMP2/AUX2 (pins 29, 30)
Input Voltage
AGND
AVDD
V
Input leakage current
pin not selected as AUX
ADC input
<10
nA
Comparator Input Offset
(COMP1, COMP2 only)
COMP2 delay (COMP2 only)
-50
0
+50
mV
s
24.576MHz crystal
10.9
PD Rev 4.0 December 2007
9
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
