MAX1233_05 Datasheet, PDF (11/45 Pages) Maxim Integrated Products – ±15kV ESD-Protected Touch-Screen Controllers Include DAC and Keypad Controller

±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
Typical Operating Characteristics (continued)
(AV_DD = DV_DD = 3V (MAX1233) or 5V (MAX1234), external V_REF = +2.5V (MAX1233), external V_REF = +4.096V (MAX1234), f_SCLK =
10MHz (50% duty cycle), f_SAMPLE = 20ksps, C_LOAD = 50pF, 0.1µF capacitor at REF, T_A = +25°C, unless otherwise noted.)
ADC REFERENCE SUPPLY CURRENT
vs. ANALOG SUPPLY VOLTAGE
750
REFERENCE SUPPLY CURRENT
vs. TEMPERATURE
750
700
700
650
650
600
600
550
2.7 3.2 3.7 4.2 4.7 5.2
AV_DD (V)
550
-40 -25 -10 5 20 35 50 65 80
TEMPERATURE (°C)
Pin Description
PIN
NAME
FUNCTION
1
DV_DD
Positive Digital Supply Voltage, +2.7V to +3.6V for MAX1233, +4.75V to +5.25V for MAX1234. Bypass
with a 0.1µF capacitor. Must be within 300mV of AV_DD.
2
AV_DD
Positive Analog Supply Voltage, +2.7V to +3.6V for MAX1233, +4.75V to +5.25V for MAX1234.
Bypass with a 0.1µF capacitor. Must be within 300mV of DV_DD.
3*
X+
X+ Position Input
4*
Y+
Y+ Position Input
5*
X-
X- Position Input
6*
Y-
Y- Position Input
7
GND
Analog and Digital Ground
8*
BAT1 Battery Monitoring Input 1. Measures battery voltages up to 6V.
9*
BAT2 Battery Monitoring Input 2. Measures battery voltages up to 6V.
10*
AUX1 Auxiliary Analog Input 1 to ADC. Measures analog voltages from zero to V_REF.
11*
AUX2 Auxiliary Analog Input 2 to ADC. Measures analog voltages from zero to V_REF.
Voltage Reference Output/Input. Reference voltage for analog-to-digital conversion. In internal
12
REF
reference mode, the reference buffer provides a 2.5V or 1.0V nominal output. In external reference
mode, apply a reference voltage between 1.0V and AV_DD. Bypass REF to GND with a 0.1µF
capacitor in the external reference mode only.
13
DACOUT DAC Voltage Output; 0.9 × AV_DD Full Scale
14
R4
Keypad Row 4. Can be reconfigured as GPIO3.
15
R3
Keypad Row 3. Can be reconfigured as GPIO2.
16
R2
Keypad Row 2. Can be reconfigured as GPIO1.
17
R1
Keypad Row 1. Can be reconfigured as GPIO0.
18
C1
Keypad Column 1. Can be reconfigured as GPIO4.
______________________________________________________________________________________ 11