Specifications

Touch Controllers Reference Guide108
Status Light (LED) Diagnostics
The LED status light on the Daughterboard controller provides
information on power-up, screen touches, and hardware problems.
For more information on the status light, refer to Chapter 3.
Serial Interface
The serial interface for the touchscreen connects the microcontroller
and the host system. The communication interface uses a universal
asynchronous communication protocol and the communication levels
are CMOS compatible.
The default communication parameters for the Daughterboard
controller are N, 7, 2 (no parity, seven data bits, and two stop bits).
The standard transmission rate for controller-to-host communication
is 9600 baud, with no handshaking. You can change the default
communication rate, parity type, number of data bits, and number
of stop bits for the Daughterboard controller.
Connectors and Cabling
To integrate the Daughterboard controller onto a system board, you
must complete the following steps:
Design a 12-pin male connector onto the system board to connect
the touchscreen cable. The Molex part number for this connector
is 8624-10-88-1121. (You can use an industry-standard equivalent
part.)
Design a 14-pin female connector onto the system board to
connect the Daughterboard controller. The Molex part number for
this connector is 70182-15-45-0907. (You can use an
industry-standard equivalent part.)
Supply the power, the CMOS serial communication, and the
touchscreen signals to the Daughterboard controller via the 14-pin
dual row male connector.