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±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
Table 7. ADC Scan Select (Touch Screen, Battery, Auxiliary Channels, and Temperature)
A/D3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
A/D2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
A/D1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
A/D0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
FUNCTION
Configures the ADC reference as selected by RES [1:0] bits as shown in Table 13. No measurement
is performed.
Measures X/Y touch position and returns results to the X and Y data registers.
Measures X/Y touch position and Z1/ Z2 touch pressure and returns results to the X, Y, Z1, and Z2
data registers.
Measures X touch position and returns results to the X data register.
Measures Y touch position and returns results to the Y data register.
Measures Z1/Z2 touch pressure and returns results to the Z1 and Z2 data register.
Measures Battery Input 1 through a 4:1 divider and returns results to the BAT1 data register.
Measures Battery Input 2 through a 4:1 divider and returns results to the BAT2 data register.
Measures Auxiliary Input 1 and returns results to the AUX1 data register.
Measures Auxiliary Input 2 and returns results to the AUX2 data register.
Measures temperature (single ended) and returns results to the TEMP1 data register.
Measures Battery Input 1, Battery Input 2, Auxiliary Input 1, Auxiliary Input 2, and temperature
(differential), and returns results to the appropriate data registers.
Measures temperature (differential) and returns results to the TEMP1 and TEMP2 data registers.
Turns on Y+, Y- drivers. No measurement is performed.
Turns on X+, X- drivers. No measurement is performed.
Turns on Y+, X- drivers. No measurement is performed.
Table 8. ADC Resolution Control
Table 10. ADC Conversion Rate Control
RES1
0
0
1
1
RES0
0
1
0
1
ADC
RESOLUTION
8 bit
8 bit
10 bit
12 bit
INTERNALLY TIMED
REFERENCE POWER-UP
DELAY* (μs)
31
31
37
44
CNR1
0
0
1
CNR0
0
1
0
FUNCTION
3.5μs/sample
(1.5μs acquisition, 2μs conversion)
3.5μs/sample
(1.5μs acquisition, 2μs conversion)
10μs/sample
(5μs acquisition, 5μs conversion)
*Applicable only for temperature, battery, or auxiliary
measurements in auto power-up reference mode.
1
1
100μs/sample
(95μs acquisition, 5μs conversion)
Table 9. ADC Averaging Control
AVG1
0
0
1
1
AVG0
0
1
0
1
FUNCTION
No data averages (default)
4 data averages
8 data averages
16 data averages
22
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