NXP Semiconductors
UM11761
PCA9955BTW-ARD evaluation board
1 Introduction
This document describes the PCA9955BTW-ARD evaluation board, which is built around
the PCA9955B, a 16-channel Fm+ I
2
C-bus 57 mA/20V constant current LED driver
produced by NXP Semiconductors. The board works as a daughterboard which can
be connected through an Arduino port to various Arduino compatible (including original
Arduino Uno R3) boards. The board is intended to test and measure the characteristics
of the PCA9955B Device Under Test (DUT).
The PCA9955BTW-ARD communicates through the Arduino port with the motherboard
(EVK) via the bidirectional Fm+ (1 MHz) I
2
C-bus. Alongside the I
2
C-bus, three additional
lines allow the motherboard to control the DUT through the same Arduino port.
The PCA9959BTW-ARD board is equipped with a pair of dedicated connectors which
allow to interconnect more boards in a chain architecture.
The PCA9955BTW-ARD board can be powered in two ways: from the EVK through
the Arduino port, or externally through a dedicated power connector, located on the
daughterboard.
The board contains three RGB LEDs and seven white LEDs allocated to all sixteen
outputs of the PCA9955B DUT. The board also contains jumpers and connectors that
allows users to disconnect the on-board LEDs, to perform short tests, and to connect
external LEDs to the driver outputs.
Additionally, the daughterboard has software support and a graphical user interface
(Windows platform) for 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 PCA9955BTW-ARD evaluation board is at
. 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 PCA9955BTW-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 PCA9955BTW-ARD requires the kit contents, additional hardware, and
a Windows PC workstation with installed software.
UM11761
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2022. All rights reserved.
User manual
Rev. 1.0 — 18 March 2022
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