MAX11800–MAX11803
Low-Power, Ultra-Small Resistive Touch-Screen
Controllers with I2C/SPI Interface
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13
AVERAGE SUPPLY CURRENT
vs. SAMPLING RATE
MAX11800
toc09
SAMPLING RATE (sps)
SUPPLY
CURRENT
(F
A)
180
160
140
120
100
80
60
40
20
0.5
1.0
1.5
2.0
2.5
3.0
0
200
DIRECT CONVERSION
MODE—AUXILIARY INPUT
sps = SAMPLES PER SECOND
AVERAGE SUPPLY CURRENT
vs. SAMPLING RATE
MAX11800
toc10
EQUIVALENT SAMPLING RATE (ksps)
SUPPLY
CURRENT
(F
A)
24
16
20
40
60
80
100
120
0
832
AUXILIARY INPUT DATA
SAMPLED AT 1ksps AND
2ksps WITH EIGHT AND
16 SAMPLES
AVERAGING
ENABLED
ksps = KILO-SAMPLES PER SECOND
INTERNAL OSCILLATOR CLOCK
FREQUENCY vs. TEMPERATURE
MAX11800
toc11
TEMPERATURE (NC)
INTERNAL
OSCILLATOR
CLOCK
FREQUENCY
(MHz)
60
35
10
-15
1.92
1.94
1.96
1.98
2.00
2.02
2.04
2.06
2.08
1.90
-40
85
VDD = 3.6V
VDD = 1.8V
VDD = 3.0V
INTERNAL OSCILLATOR CLOCK
FREQUENCY vs. SUPPLY VOLTAGE
MAX11800
toc12
VDD (V)
INTERNAL
OSCILLATOR
CLOCK
FREQUENCY
(MHz)
3.0
2.4
1.92
1.94
1.96
1.98
2.00
2.02
2.04
2.06
2.08
1.90
1.8
3.6
POWER CONSUMPTION
vs. SAMPLE RATE
MAX11800
toc13
SAMPLE RATE (cps)
POWER
CONSUMPTION
(F
W)
150
100
50
20
40
60
80
100
120
140
160
0
200
DATA TAKEN WITH
RESISTIVE TOUCH SENSOR
AUTONOMOUS MODE*
*MAX11800/MAX11801
DIRECT CONTINUOUS MODE
DIRECT EDGE MODE
cps = COORDINATES
PER SECOND
Typical Operating Characteristics (continued)
(VDD = 1.8V at TA = -40°C to +85°C (TA = -40°C, TA = 0°C, TA = +25°C, and TA = +85°C), 12-bit mode, all measurements using
noncontinuous AUX input. SPI = 10MHz and I2C = 400kHz, unless otherwise noted. Resistive touch-screen panel (X+ to X- = 608
Ω,
Y+ to Y- = 371
Ω).)