AR1100-I MICROCHIP [Microchip Technology], AR1100-I Datasheet - Page 14

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

4.1.3
The USB can enumerate as one of three ‘devices’ (or
device types) identified by a byte in EEPROM. See
Table
TABLE 4-1:
The HID-MOUSE and HID-DIGITIZER types are
recognized by many host operating systems and will
provide cursor movement with a touch.
The HID-GENERIC type is a proprietary style, which
would require a custom software driver to support.
The controller defaults to the HID-MOUSE device type,
unless it is commanded to enumerate as one of the
other supported types.
Once
signaled/commanded to re-enumerate as the same
device or to one of the other two. In processing the
command, the AR1100 writes the desired USB device
type to EEPROM prior to detaching from the bus and
executing a Reset. The SET_FEATURE control transfer
or a WRITE standard data transfer (via the Interrupt
end point) is used to convey the command (described
in
4.2
Data protocol utilizes multi-byte packet transfers in two
categories/formats:
1.
2.
4.2.1
Touch reports always originate from the AR1100 and
are transmitted in response to touch detection. The
format of the touch report is mode-dependent.
The measurement resolution for touch coordinates is
10-bit. The measured values are shifted (multiplied by
4) and reported in a 12-bit format. In the reporting
protocol, the Least Significant coordinate bits X1:X0
and Y1:Y0 will be zeros. The resulting full-scale range
for reported touch coordinates is 0 to 4095.
4.2.1.1
The ‘standard’, 5-byte touch report is formatted as in
Table
DS41606B-page 14
HID-GENERIC
HID-MOUSE
HID-DIGITIZER Single-input digitizer
Note:
Section 5.0,
Touch reports
Command packets
NAME
4-1.
4-2:
enumerated,
Data Protocol
USB MODE
The HID-MOUSE requires SET_FEATURE
and does not support a data WRITE.
TOUCH REPORTS
Mode: UART, HID-GENERIC
Commands).
USB IDs
Proprietary (AR1000-style)
Mouse, absolute coordinates 0-4095
the
USB
DESC
device
can
be
CLASS
HID
HID
HID
VENDOR
x04D8
x04D8
x04D8
ID
PRODUCT
 2011 Microchip Technology Inc.
x0C01
x0C02
x0C03
ID
SPEED
FULL
FULL
FULL