MAX1233_05 Datasheet, PDF (13/45 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
C1 C2 C3 C4 R1 R2 R3 R4
MAX1233
MAX1234
OSCILLATOR
*X+
*X-
*Y+
*Y-
*BAT1
*BAT2
*AUX1
*AUX2
REF
DACOUT
*ESD PROTECTED
Figure 1. Block Diagram
TEMP
SENSOR
X/Y SWITCHES
MUX
BATTERY MONITOR
BATTERY MONITOR
8-BIT
DAC
REF
DAC
+AVDD
FORCE LINE
Y+
SENSE LINE _{+IN +REF}
X+
-IN _-REF
SENSE
LINE
FORCE LINE
Y-
GND
Figure 2. Touch-Screen Measurement
KEYPAD CONTROLLER
AND GPIO
REGISTERS AND
SCAN STATE
CONTROL
12-BIT
ADC
SERIAL
DATA
I/O
DOUT
SCLK
DIN
CS
PENIRQ
KEYIRQ
BUSY
INTERNAL
REFERENCE
2.5V/1.0V
Table 1. Maximum Input Source
Impedance
ACQUISITION
TIME (µs)
RESOLUTION
(BITS)
MAXIMUM R_SOURCE FOR
COMPLETE SETTLING
DURING ACQUISITION (kΩ)
1.5
8
2.6
1.5
10
2.0
1.5
12
1.5
5.0
8
23
5.0
10
19
5.0
12
15
95
8
560
95
10
470
95
12
400
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