AR1000_16 Datasheet, PDF (17/61 Pages) Microchip Technology – AR1000 Series Resistive Touch Screen Controller

AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER
4.8 Touch Report Protocol
Touch coordinates, when available, are provided to the
master by the AR1021 in the following protocol (See
Figure 4-3).
FIGURE 4-3:
I²C TOUCH REPORT PROTOCOL
Note that the IRQ signal shown above occurs on the
SDO pin of the AR1021.
4.9 Command Protocol
The master issues supported commands to the
AR1021 in the following protocol.
Below is an example of the ENABLE_TOUCH command
(see Figure 4-4).
FIGURE 4-4:
I²C COMMAND PROTOCOL
Note that the IRQ shown above occurs on the SDO pin.
• 0x9A
• 0x00
• 0x55
• 0x01
• 0x12
AR1021 Device ID address
Protocol command byte (send 0x00 for
the protocol command register)
Header
Data size
Command
4.10 Sleep State
Pending communications are not maintained through a
sleep/wake cycle.
If the SDO pin is asserted for a pending touch report or
command response, and the AR1021 enters a Sleep
state, prior to the master performing a read on the data,
then the data is lost.
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DS40001393C-page 17