MAX11800_1010 Datasheet, PDF (12/59 Pages) Maxim Integrated Products – Low-Power, Ultra-Small Resistive Touch-Screen Controllers with I2C/SPI Interface

Low-Power, Ultra-Small Resistive Touch-Screen
Controllers with I²C/SPI Interface
Typical Operating Characteristics
(V_DD = 1.8V at T_A = -40°C to +85°C (T_A = -40°C, T_A = 0°C, T_A = +25°C, and T_A = +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- = 608Ω,
Y+ to Y- = 371Ω).)
AVERAGE SUPPLY CURRENT
vs. SAMPLING RATE
90
AUTONOMOUS MODE
80 MAX11800
70 ^MAX11801
AVERAGE SUPPLY CURRENT
vs. SAMPLING RATE
5
DIRECT CONTINUOUS
4
INTERRUPT MODE
AVERAGE SUPPLY CURRENT
vs. SAMPLING RATE
5
DIRECT EDGE
4
INTERRUPT MODE
60
3
3
50
40
2
2
30
20
DATA TAKEN WITH
10 RESISTIVE TOUCH
0 ^SENSOR
cps = COORDINATES
PER SECOND
0 20 40 60 80 100 120 140 160 180 200
SAMPLING RATE (cps)
1
cps = COORDINATES PER SECOND
0
0 20 40 60 80 100 120 140 160 180 200
SAMPLING RATE (cps)
1
cps = COORDINATES PER SECOND
0
0 20 40 60 80 100 120 140 160 180 200
SAMPLING RATE (cps)
SUPPLY CURRENT IN POWER-DOWN
vs. TEMPERATURE
0.40
0.36
0.32
0.28
0.24
0.20
0.16
0.12
0.08
0.04
0
-40 -15
10
35
60
85
TEMPERATURE (NC)
CHANGE IN ADC GAIN
vs. TEMPERATURE
4
SWITCH RESISTANCE
vs. SUPPLY VOLTAGE
8
7
Y+
6
5 ^{X+ Y-}
4 ^X-
3
1.6 2.0 2.4 2.8 3.2 3.6
V_DD (V)
4
SWITCH RESISTANCE
vs. TEMPERATURE
7
Y+
6
5
X+
4
Y-
X-
3
2
1
-40 -15
10
35
60
85
TEMPERATURE (NC)
CHANGE IN ADC OFFSET
vs. TEMPERATURE
3
3
2
2
1
1
0
0
-1
-1
-2
-2
-3
-3
-4
-40 -10
20
50
80 110
TEMPERATURE (NC)
-4
-40 -10
20
50
80 110
TEMPERATURE (NC)
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