AR1000 Datasheet, PDF (12/37 Pages) Microchip Technology – Resistive Touch Screen Controller

7.7 Communication Interface
The desired communication type is hardware selectable by chip part number and using pin M1.
Type
I²C
SPI
UART
Chip P/N
AR1020
AR1020
AR1010
M1 pin
VSS
VDD
VDD
Table 5 : Communication Selection
The communication interface pins are shown below for each communication type.
Type
UART
I²C
SPI
Communication Pins
RX, TX, VSS
SCL, SDA, SDO (Irq), VSS
SCK, SDI, SDO, SS, SIQ (Irq), VSS
Table 6 : Communication Pins
7.7.1 I²C
I²C operates in slave mode with 7-bit address of 0x9A.
The SDO pin functions as an interrupt output. It is asserted high when data is available.
Timing diagrams are shown below.
Figure 7 : I²C Timing Diagram – Receive Data
Figure 8 : I²C Timing Diagram – Transmit Data
DS41393A-Page 8
© 2009 Microchip Technology, Inc.