AR1100 datasheet(13/58 Pages) MICROCHIP

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 2011 Microchip Technology Inc.

DS41606B-page 13

AR1100 RESISTIVE USB AND RS-232 TOUCH SCREEN CONTROLLER

4.0

COMMUNICATION

4.1

Physical

The AR1100 supports UART and USB communication

and will automatically detect the active mode between

the two. Additionally, USB mode will enumerate as one

of three ‘devices’. The default USB device type is

defined (and can be changed) by the configuration

command and is saved in nonvolatile memory. The fac-

tory default is HID-MOUSE.

UART/Serial

HID-GENERIC

HID-MOUSE

HID-DIGITIZER

4.1.1

MODE DETECT/SELECT

To support auto-detection – the firmware and hardware

resources for UART and USB are both functional at

power-up until the active mode is determined by one of

the following events.

USB successfully enumerates – result: USB is

active

Valid communication is received via UART –

result: UART is active

The Sleep timer has expired and USB has not

yet enumerated – result: UART is active (by

default)

Once the active communication mode is determined,

the ‘inactive’ mode is decommissioned to minimize

power. The active communication mode will remain in

force until the AR1100 is reset.

4.1.2

UART MODE

In UART mode, the AR1100 supports a simple, 2-wire

(transmit/receive) asynchronous serial communication.

The device does not support hardware handshaking

but does employ a data protocol handshake described

in the device command section. The host should be

configured for 9600 BAUD, 8 data bits and 1 Stop bit.

Note:

Immediately after Reset, the AR1100 will

not attempt to ‘Sleep’ for at least 45

seconds

allow

time

for

USB

enumeration – no matter the setting of the

Sleep timer parameter.

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