AR1100-I MICROCHIP [Microchip Technology], AR1100-I Datasheet - Page 13

• Manufacturer Part Number: AR1100-I
• Description: AR1100 Resistive USB and RS-232 Touch Screen Controller
• Manufacturer: MICROCHIP [Microchip Technology]

4.0
4.1
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.
1.
2.
3.
4.
4.1.1
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.
1.
2.
3.
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
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.
 2011 Microchip Technology Inc.
Note:
UART/Serial
HID-GENERIC
HID-MOUSE
HID-DIGITIZER
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)
COMMUNICATION
Physical
MODE DETECT/SELECT
Immediately after Reset, the AR1100 will
not attempt to ‘Sleep’ for at least 45
seconds
enumeration – no matter the setting of the
Sleep timer parameter.
UART MODE
to
allow
time
for
USB
DS41606B-page 13