Texas Instruments TCA8418E, User Manual

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COL9 COL8 COL7 COL6 COL5 COL4
GND V
CC
ROW7 ROW6 ROW5 ROW4
COL3 COL2 COL1
ROW3 ROW2 ROW1
COL0
ROW0
J5
Setup
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5 Setup
This section describes the header/jumper connections on the TCA8418E-EVM, installation of the firmware
on the MSP430 LaunchPad, installation of the software (GUI) on the computer, and getting started using
the TCA8418E-EVM with any of the supported devices.
5.1 Header/Jumper Connections Description
5.1.1 TP1: Power Input
Test point TP1 allows power input without the LaunchPad. The range is 1.65 V to 3.6 V.
5.1.2 TP2 and TP3: Ground
Test points TP2 and TP3 are connected to ground.
5.1.3 J1 and J2: MSP430 LaunchPad Interface Headers
Headers J1 and J2 are the connectors for the MSP430 LaunchPad to the TCA8418E-EVM.
5.1.4 J3: I
2
C Test Points
Header J3 is a test point for SDA and SCL, and allows I
2
C input when the LaunchPad is not present.
5.1.5 J4: RESET and Interrupt Test Points
Test point J4 is a test point for the RESET input, INT output, and CAD_INT output.
5.1.6 J5: Keypad Extension Header
Header J5 allows extension of the functionality of the TCA8418E-EVM onto a larger keypad or GPIO
expander board.
Figure 2. Header J5 Connections to TCA8418E Pins (Top View)
5.1.7 SW1, SW2, SW3, SW11, SW12, SW13, SW21, SW22, SW23: Keypad Switches
These switches are named in accordance with the Key Value Assignment table in the TCA8418E
(
SCPS222 ) datasheet. They are for ROW0-ROW2 and COL0-COL2, which are programmed as keypad
I/Os, by default, on the TCA8418E-EVM.
4 TCA8418E Keypad Scan EVM SLVUAA2 – August 2014
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