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Items Required for Operation
4
Items Required for Operation
The following items are required to program a TCA8424:
•
TCA8424 EVM with un-programmed TCA8424 in socket
•
Single 3.3-V supply
•
MSP-EXP430G2 Rev 1.5 Launchpad with MSP430G2553 installed
•
USB to mini-USB cable
•
PC with Code Composer Studio installed running supplied firmware
•
PC with Application GUI installed
The following items are required to evaluate at the system level:
•
TCA8424 EVM with programmed TCA8424 in socket
•
Breakout wires to connect to keyboard matrix rows and columns
•
Keyboard matrix
•
Host system with I
2
C plus INT connected to board
5
Introduction
The benefits of the TCA8424 over other microcontroller-based solutions are lower development costs,
smaller package, and lower power consumption. The lower development costs are seen due to the
TCA8424 requiring programming of only 512 Bytes of OTP versus a full code stack on a microcontroller.
The TCA8424 is fully compliant with HID over I
2
C based systems with little to no host firmware
development.
The TCA8424 can also be used in a non-Hid over I
2
C environment by developing host drivers that mimic
the HID over I
2
C protocol to interpret the input reports. The EVM features a socket to allow easy
programming of multiple units for testing. The code stack supplied with the EVM is designed to interface
with the MSP430G2553 Launchpad to accomplish this. Once programmed, the EVM features breakout
headers for the keyboard and I
2
C connections to test in customer systems.
3
SCDU004 – March 2013
TCA8424 Evaluation Module
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