MAX1234ETI+T Maxim Integrated Products, MAX1234ETI+T Datasheet - Page 13

• 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

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