General Description; Hardware Description; Overview; Content - Semtech SX8650 User Manual

ADVANCED COMMUNICATIONS & SENSING

1. General Description

This user's guide describes the characteristics, operation, and use of the SX8650EVK. This evaluation module is a 4-wire
touch screen controller which also has auxiliary input. The hardware and software description and the schematic diagram
are included.

2. Hardware Description

2.1. Overview

The SX8650EVK is the board for evaluation of the 4-wire resistive touch screen controller SX8650. Since SX8650EVK is
provided with a touch-panel, it is easy to check the functionality of the chip.
The EVK and its supporting documentation allows for customers to develop software that can be used in eventual
implementations. No external supply is needed to power the board. A USB cable is provided to connect the EVK to a
Windows based PC for operation of the software.

2.2. Content

The evaluation kit is composed of the following parts:
The board with the SX8650 and the touch screen on the top
A USB cable to connect the board to the PC
A CDROM with the installation files and the user guide
A stylus to write on the touch screen

2.3. Board

The board is split in 2 areas. From the bottom view (component side), the left area is the interface between the USB of the
PC and the SX8650. The right area is dedicated to the SX8650 and the touch screen connectors.
The S_ON switch is the SX8650 power supply switch. A red led is lighted in the ON position. When it is switch off the
SX8650 is not supplied but the interface circuitry is still powered on.

2.3.1. Connection to the SX8650

The left side of JP1 (odd number) is connected to the SX8650 host and the power pins.
The right side of JP1 (even number) is connected to the interface pins of the SX8650.
The jumpers allow the connection between the host and the SX8650. If an external host, power supply, or auxiliary input
should be used, the jumper would be removed.
Pin Number Signal
JP1(1-3) GND_0
JP1(3-4) V3V3
JP1(5-6) V3V3PU
JP1(7-8) SCL
JP1(9-10) SDA
JP1(11-12) NRST
JP1(13-14) NIRQ
JP1(15-16) A0
JP1(17-18) AUX
JP1(19-20) V3V3reg
Table 1 JP1 Pinout
Revision V2.1/June 2010
©2010 Semtech Corp.
Description
Ground
1.85V, 3.3V or external supply voltage
Unused
I2C bus serial clock
I2C bus data line
SX8650 Reset pin
SX8650 interrupt pin
SX8650 I2C address selection
SX8650 Auxiliary input
Unused
Page 3
SX8650EVK
USER GUIDE
www.semtech.com