MAX11800_1010 Datasheet, PDF (13/59 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 (continued)
(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
3.0
DIRECT CONVERSION
MODE—AUXILIARY INPUT
2.5
2.0
1.5
1.0
AVERAGE SUPPLY CURRENT
vs. SAMPLING RATE
120
AUXILIARY INPUT DATA
100
SAMPLED AT 1ksps AND
2ksps WITH EIGHT AND
16 SAMPLES
80 AVERAGING
ENABLED
60
40
INTERNAL OSCILLATOR CLOCK
FREQUENCY vs. TEMPERATURE
2.08
2.06
V_DD = 3.0V
2.04
2.02
V_DD = 1.8V
2.00
1.98
1.96
V_DD = 3.6V
0.5
sps = SAMPLES PER SECOND
0
0 20 40 60 80 100 120 140 160 180 200
SAMPLING RATE (sps)
20
0
8
ksps = KILO-SAMPLES PER SECOND
16
24
32
EQUIVALENT SAMPLING RATE (ksps)
1.94
1.92
1.90
-40 -15
10
35
60
85
TEMPERATURE (NC)
INTERNAL OSCILLATOR CLOCK
FREQUENCY vs. SUPPLY VOLTAGE
2.08
2.06
2.04
2.02
2.00
1.98
1.96
1.94
1.92
1.90
1.8
2.4
3.0
3.6
V_DD (V)
POWER CONSUMPTION
vs. SAMPLE RATE
160
DATA TAKEN WITH
140 _{RESISTIVE TOUCH SENSOR}
120 AUTONOMOUS MODE*
100
80
DIRECT CONTINUOUS MODE
60
cps = COORDINATES
40
PER SECOND
20 _{DIRECT EDGE MODE}
0
0
50
100
150
200
SAMPLE RATE (cps)
*MAX11800/MAX11801
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