MAX1234ETI+T Maxim Integrated Products, MAX1234ETI+T Datasheet - Page 22

• Manufacturer Part Number: MAX1234ETI+T
• Description: IC CNTRLR TOUCH 28-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Resistiver

Specifications of MAX1234ETI+T

• Touch Panel Interface: 4-Wire
• Number Of Inputs/keys: 1, 4 x 4 Keypad
• Resolution (bits): 8, 10, 12 b
• Data Interface: MICROWIRE™, QSPI™, Serial, SPI™
• Data Rate/sampling Rate (sps, Bps): 50k
• Voltage Reference: Internal
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Applications: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
Table 7. ADC Scan Select (Touch Screen, Battery, Auxiliary Channels, and Temperature)
Table 8. ADC Resolution Control
* Applicable only for temperature, battery, or auxiliary
measurements in auto power-up reference mode.
Table 9. ADC Averaging Control
22
A/D3
RES1
AVG1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
1
1
0
0
1
1
______________________________________________________________________________________
A/D2 A/D1
RES0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
AVG0
0
1
0
1
0
1
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
RESOLUTION
10 bit
12 bit
A/D0
ADC
8 bit
8 bit
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
No data averages (default)
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.
16 data averages
4 data averages
8 data averages
FUNCTION
REFERENCE POWER-UP
INTERNALLY TIMED
DELAY* (µs)
31
31
37
44
Table 10. ADC Conversion Rate Control
CNR1
0
0
1
1
FUNCTION
CNR0
0
1
0
1
3.5µs/sample
(1.5µs acquisition, 2µs conversion)
3.5µs/sample
(1.5µs acquisition, 2µs conversion)
10µs/sample
(5µs acquisition, 5µs conversion)
100µs/sample
(95µs acquisition, 5µs conversion)
FUNCTION