MAX11800_1010 Datasheet, PDF (31/59 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
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.
X PSU
X MEAS
Y PSU
Y MEAS
Z PSU
Z1 MEAS
Z2 MEAS
NO
X AVG
YES
NO
Y AVG
DONE
DONE
YES
NO
Z1 AVG YES
NO Z2 AVG
DONE
DONE
YES
YES
XYZ1 OR _YES
XYZ1Z2
MODE
NO
XYZ1Z2
MODE
NO
POWER-DOWN
PUR
ACM REQUEST
PUR
PUF
TOUCH
PUF
TAG
DATA
PRESENT
LPM
(WAIT scanp)
TOUCH
NOT PRESENT
INITIAL
TOUCH
TDM
WAIT TINIT
NO TOUCH
Figure 14. State Machine Transitions––Autonomous Conversion Mode—MAX11800/MAX11801
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