MAX11800–MAX11803
Low-Power, Ultra-Small Resistive Touch-Screen
Controllers with I2C/SPI Interface
12
______________________________________________________________________________________
AVERAGE SUPPLY CURRENT
vs. SAMPLING RATE
MAX11800
toc01
SAMPLING RATE (cps)
SUPPLY
CURRENT
(F
A)
180
160
120 140
40 60 80 100
20
10
20
30
40
50
60
70
80
90
0
200
AUTONOMOUS MODE
MAX11800
MAX11801
cps = COORDINATES
PER SECOND
DATA TAKEN WITH
RESISTIVE TOUCH
SENSOR
AVERAGE SUPPLY CURRENT
vs. SAMPLING RATE
MAX11800
toc02
SAMPLING RATE (cps)
SUPPLY
CURRENT
(F
A)
180
160
140
120
100
80
60
40
20
1
2
3
4
5
0
200
DIRECT CONTINUOUS
INTERRUPT MODE
cps = COORDINATES PER SECOND
AVERAGE SUPPLY CURRENT
vs. SAMPLING RATE
MAX11800
toc03
SAMPLING RATE (cps)
SUPPLY
CURRENT
(F
A)
180
160
140
120
100
80
60
40
20
1
2
3
4
5
0
200
DIRECT EDGE
INTERRUPT MODE
cps = COORDINATES PER SECOND
SUPPLY CURRENT IN POWER-DOWN
vs. TEMPERATURE
MAX11800
toc04
TEMPERATURE (NC)
POWER-DOWN
SUPPLY
CURRENT
(
A)
60
35
10
-15
0.04
0.08
0.12
0.16
0.20
0.24
0.28
0.32
0.36
0.40
0
-40
85
SWITCH RESISTANCE
vs. SUPPLY VOLTAGE
MAX11800
toc05
VDD (V)
R ON
(I
)
3.2
2.8
2.4
2.0
4
5
6
Y+
7
8
3
1.6
3.6
X+
Y-
X-
SWITCH RESISTANCE
vs. TEMPERATURE
MAX11800
toc06
TEMPERATURE (NC)
R ON
(I
)
60
35
10
-15
2
3
4
5
6
7
1
-40
85
X-
X+
Y-
Y+
CHANGE IN ADC GAIN
vs. TEMPERATURE
MAX11800
toc07
TEMPERATURE (NC)
DELTA
FROM
+25
NC
(LSB)
80
50
-10
20
-3
-2
-1
0
2
1
3
4
-4
-40
110
CHANGE IN ADC OFFSET
vs. TEMPERATURE
MAX11800
toc08
TEMPERATURE (NC)
DELTA
FROM
+25
NC
(LSB)
80
50
-10
20
-3
-2
-1
0
2
1
3
4
-4
-40
110
Typical Operating Characteristics
(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).)