NXP Semiconductors
UM11711
PCAL6524EV-ARD evaluation board
1 Introduction
This document describes the PCAL6524EV-ARD evaluation board. The evaluation board
is built around the PCAL6524, ultra-low voltage translating 24-bit I
2
C-bus/SMBus I/O
expander with interrupt output, reset, and configuration registers, produced by NXP
Semiconductors. The evaluation board serves as a daughter card that can be connected
through an Arduino port to various Arduino compatible (including original Arduino Uno
R3) EVK / mother boards for testing and measuring the characteristics of the PCAL6524
Device Under Test (DUT).
The PCAL6524EV-ARD daughter card communicates through the Arduino port with the
host device via the Fast-mode I
2
C-bus. Alongside the I
2
C-bus, three additional digital
lines allows the motherboard to control the DUT through the same Arduino port.
Power is delivered from the motherboard (EVK) through the Arduino port also.
The I/O pins of the DUT are organized in three ports. Each port (P0, P1 and P2) is 8-
bit wide, so the PCAL6524 manages a total amount of 24 I/O lines. The port P0 and P1
controls an on-board four-digit LED display through the MAX V CPLD (Intel/Altera). The
board contains also four on-board LEDs and four switches, connected to P2 port of the
DUT. All I/O lines are shared with two connectors for external access to the I/O pins (J6
and J7, see the schematic diagram of the PCAL6524EV-ARD evaluation board).
Additionally, a Graphical User Interface (Windows platform) is provided to facilitate the
evaluation of the daughterboard. The GUI is used with the following NXP evaluation
boards: IMXRT1050 EVK Board, LPCXpresso55S69 Development Board and i.MX 8M
Mini LPDDR4 EVK Board.
2 Finding kit resources and information on the NXP web site
NXP Semiconductors provides online resources for evaluation board and its supported
device(s) on
The information page for PCAL6524EV-ARD evaluation board is at http://
. The information page provides overview information,
documentation, software and tools, parametrics, ordering information and a
Getting
Started
tab. The Getting Started tab provides quick-reference information applicable
to using the PCAL6524EV-ARD evaluation board, including the downloadable assets
referenced in this document.
2.1 Collaborate in the NXP community
The NXP community is for sharing ideas and tips, ask and answer technical questions,
and receive input on just about any embedded design topic.
The NXP community is at
3 Getting ready
Working with the PCAL6524EV-ARD requires the kit contents, additional hardware, and a
Windows PC workstation with installed software.
UM11711
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2022. All rights reserved.
User manual
Rev. 1.0 — 19 January 2022
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