Texas Instruments BoosterPack BOOSTXL-IOLINKM-8 EVM User Manual page 8

Evaluation Module Overview
1.4.5 TCA6424A
This 24-bit I/O expander for the two-line bidirectional bus (I2C) is designed to provide general-purpose remote
I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL) and serial data (SDA)].
The major benefit of this device is its wide VCC range. It can operate from 1.65 V to 5.5 V on the P-port side
and on the SDA/SCL side. This allows the TCA6424A to interface with next-generation microprocessors and
microcontrollers on the SDA/SCL side, where supply levels are dropping down to conserve power. In contrast to
the dropping power supplies of microprocessors and microcontrollers, some PCB components, such as LEDs,
remain at a 5-V power supply.
32
INT
LP Filter
26
ADDR
29
SCL
Input
30
Filter
SDA
31
V
CCI
27
V
CCP Power-On
28
RESET
25
GND
8 BOOSTXL-IOLINKM-8 EVM User's Guide
Interrupt
Logic
2
I C Bus
Control
Reset
Figure 1-5. TCA6424A Functional Block Diagram
Copyright © 2023 Texas Instruments Incorporated
Shift
24 Bits I/O Port
Register
Write Pulse
Read Pulse
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P27 –P20
P17–P10
P07–P00
SLLU357 – MAY 2023
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