MAX11800_10 Datasheet, PDF (31/57 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
Autonomous Conversion Mode
The MAX11800/MAX11801 perform measurements
automatically and inform the AP when they are com-
plete in autonomous conversion mode, reducing data
transfers on the serial bus as well as generating fewer
interrupt requests. Figure 14 shows the state machine
transitions for autonomous conversion mode.
POWER
DOWN
TOUCH-
DETECT
ROUGH
PULLUP
NO
TOUCH
TOUCH-
DETECT
FINE
PULLUP
AVERAGE
CONVERSION
LAST
CONVERSION
Y
ACQUIRE
SETUP
Y
PANEL
XY MODE
X _{Y Z1 Z2 MODE}
TOUCH-
DETECT
ROUGH
PULLUP
TIME IS UP
TOUCH-
DETECT
FINE
PULLUP
TIME IS UP
TOUCH
DETECT
SETUP
Z
PANEL
Z1
ACQUIRE
AVERAGE
CONVERSION
LAST
CONVERSION
TOUCH
DETECT
AVERAGE
CONVERSION
LAST
CONVERSION
AVERAGE
CONVERSION
LAST
CONVERSION
Z2
ACQUIRE
SETUP
X
PANEL
TIME IS UP
X
ACQUIRE
Figure 14. State Machine Transitions––Autonomous Conversion Mode
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