Datasheet

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1 EVM Overview
1.1 Features
1.2 Introduction
2 Analog Interface
EVM Overview
• Full-featured evaluation board for the ADS7845 5-wire, resistive touch screen controller (TSC)
• Modular design for use with a variety of DSP and microcontroller interface boards
The ADS7845EVM-PDK is a complete evaluation kit, which includes a USB-based motherboard and
evaluation software for use with a personal computer running Microsoft Windows™ operating systems
(Windows 2000 or higher).
The ADS7845EVM is in Texas Instruments' modular EVM form factor, which allows direct evaluation of
the ADS7845 performance and operating characteristics, and eases software development and system
prototyping. This EVM is compatible with the 5-6K Interface Board (SLAU104 ) and the HPA-MCU
Interface Board (SLAU106 ) from Texas Instruments and additional third-party boards such as the HPA449
demonstration board from SoftBaugh, Inc. (www.softbaugh.com ).
The ADS7845EVM-PDK is a complete evaluation/demonstration kit, which includes a USB-based
motherboard called the USB-MODEVM Interface Board and evaluation software for use with a personal
computer running Microsoft Windows operating systems.
For maximum flexibility, the ADS7845EVM is designed for easy interfacing to multiple analog sources.
Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin,
dual-row, header/socket combination at J1. This header/socket provides access to the analog input pins of
the TSC. Consult Samtec at www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating connector
options.
Table 1. Analog Interface Pinout
Pin Number Signal Description
J1.2 UL Touch screen Upper Left (UL) electrode
J1.4 LL Touch screen Lower Left (LL) electrode
J1.6 UR Touch screen Upper Right (UR) electrode
J1.8 LR Touch screen Lower Right (LR) electrode
J1.10 WIPER Touch screen Wiper electrode
J1.12 AUXIN Auxiliary input, 0V to VREF
J1.14 Unused
J1.16 Unused
J1.18 REF(–) Tied to analog ground
J1.20 REF(+) External reference source input (2.5V NOM)
J1.15 Unused
J1.11-J1.19 (odd) AGND Analog ground connections (except J1.15)
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ADS7845EVM and ADS7845EVM-PDK2 SBAU122 – March 2006
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