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The NXP analog product development boards provide an easy-to-use platform for evaluating NXP products. The boards support a range of analog, mixed-signal and power solutions. They incorporate monolithic integrated circuits and system-in-package devices that use proven high-volume technology. NXP products offer longer battery life, a smaller form factor, reduced component counts, lower cost and improved performance in powering state-of-the-art systems.
This page will guide you through the process of setting up and using the PCA9955BTW- ARD board.
The PCA9955BTW-ARD contents include:
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Familiarity with the I2C bus is helpful but not required.
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This device is sensitive to electrostatic discharge (ESD). Therefore care should be taken during transport and handling. You must use a ground strap or touch the PC case or other grounded source before unpacking or handling the hardware.
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This evaluation board requires a Windows PC workstation. Meeting these minimum specifications should produce great results when working with this evaluation board.
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R3
port for direct connection with Arduino devicesNote: For i.MX Mini LPDDR4 EVK board, it is necessary to use IMX8MMINI-IARD interposer board between the EVK and PCA9955BTW-ARD daughterboard (see IMX8MMINI-IARD User Manual ).
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The PCA9955BTW-ARD evaluation board is built around the PCA9955B, a 16-channel Fm+ I2C-bus 57 mA / 20 V 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).
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Overview of the PCA9955BTW-ARD board
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PCA9955BTW-ARD evaluation board is designed and built as a daughterboard able to work in conjunction with a mother board equipped with an Arduino port. The board was built to be fully compatible with the following NXP evaluation (EVK) boards:
Each evaluation/development board benefits by firmware support which can be downloaded from the NXP company site. Before starting, the EVK motherboard must be programmed with the corresponding firmware package. Additionally, a GUI application (Windows 10) is available for download from the NXP site, allowing rapid testing and operation of PCA9955BTW-ARD daughterboard through one of the above mentioned EVKs.
For details regarding installation of the EVK firmware and GUI host software on PC, see UM11581, Arduino Shields GUI and firmware installation . Once the software is installed, the first step is to select the correct combination EVK – PCA9955BTW-ARD daughter card and then the board can be controlled from the GUI interface.
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Figure 1 shows the required hardware for operation of the PCA9955BTW-ARD daughterboard with IMXRT1050 EVK. The following items are necessary:
The IMXRT1050 EVK mother board can be powered by one of the three methods:
J2
) on the boardJ9
) on the boardJ28
) on the board. When the PC is connected in this fashion, the USB port can simultaneously act as a debug
interface. Therefore, by using a single USB cable connected to J28
, the EVK can be powered and at the same time linked to the PC for data exchange.
The older USB ports (from PC) are not able to deliver the necessary current (500 mA), before establishing the communication, use an external power supply (connected to
J2
).
From J1
on the EVK board (see Figure 1) the user can select the power configuration for the mother board. For further details, refer to the MIMXRT1050 EVK
board hardware user's guide.
Figure 1. PCA9955BTW-ARD daughterboard and IMXRT1050 EVK board, before starting
To configure the hardware and workstation, complete the following procedure:
J1
). If using J28
for power supply, the J1
jumper shall be placed in
position 5-6. If using an external power supply (connected to J2
), the jumper J1
will be placed in position 1-2
J28
, connect the EVK board to a USB port of the computerFigure 2 shows the boards during the operation:
Figure 2.The assembly PCA9955BTW-ARD daughterboard / IMXRT1050 EVK board operation
Figure 3 shows the required hardware for operation of the PCA9955BTW-ARD and LPCXpresso55S69 EVK board. This configuration consists of:
The LPCXpresso55S69 development board is equipped with four USB micro-B connectors: P5, P6, P9 and P10. The board can be powered through any USB port. Using P6 USB connector to connect the board to the PC simplifies the start-up operation because P6 is designated for debugging and the USB cable thus accomplishes two tasks at the same time: powering the board and serving as a data link between the EVK board and PC. For more details regarding power-up and operation of the LPCXpresso55S69 development board, see the LPCXpresso55S69/LPCXpresso55S28 development board user manual .
Figure 3. PCA9955BTW-ARD daughterboard and LPCXpresso55S69 mother board, before starting
The following steps describe how to assemble, program and operate the configuration:
P16
– P19
connectors located on
LPCXpresso55S69 development board (see the marked pins of P16
– P19
, Figure 4)P6
USB port of PCFigure 4 shows the two boards in operation:
Figure 4. PCA9955BTW-ARD daughterboard / LPCXpresso55S69 mother board operation
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When an i.MX 8M Mini LPDDR4 EVK board is used with the PCA9955BTW-ARD board, a third board (IMX8MMINI-IARD interposer
board) must be used, especially designed and built
as EVK – daughter board interconnection. The EVK board i.MX 8M Mini LPDDR4 is not equipped with an Arduino port;
instead it has a 2 x 20-pin expansion connector
(J1003
, see i.MX 8M Mini LPDDR4 EVK user manual).
J1003
is a multipurpose port, containing various digital I/O lines, including specialized
I2C and SPI buses. Starting from the expansion connector pin chart, an Arduino port interposer board was
developed, with the role of signal-to-signal bridge
between the 2 x 20 connector pins on the i.MX 8M Mini LPDDR4 EVK and the mated connectors of the Arduino port present
on the PCA9955BTW-ARD daughterboard.
To operate the setup, along with the EVK and the daughter board, a third board must be included in the setup assembly. Figure 5 shows the necessary boards and how these boards are connected. The configuration consists of:
It is recommended to attach the PCA9955BTW-ARD to the Arduino connectors of the IMX8MMINI-IARD interposer board first,
and then the resulting assembly to the i.MX 8M
Mini LPDDR4 EVK. This can be done by plugging J1
connector located on the interposer board to
J1003
connector on the EVK.
To power-up the EVK, a USB-C type cable connected to PORT 2
of the EVK is used. The power switch
SW101
on the EVK board must be set to ON
position to power-up the setup. Data communication is achieved by routing a separate USB (micro-B type) cable from a
USB port on the PC to debug port
(J901
) on the EVK (see Figure 5 and Figure 6).
The user may find details regarding power-up and operation of the setup assembly in 8MMINILPDDR4-EVK user manual.
Figure 5. The assembly PCA9955BTW-ARD daughterboard, IMX8MMINI-IARD interposer board and i.MX 8M Mini LPDDR4 EVK, before starting
To configure and operate the setup, follow the below steps:
J1
(located on the bottom of the board) into J1003
expansion board located on the top side of i.MX 8M
Mini LPDDR4 EVK (see Figure 6)
2
J901
debug portSW101
in ON position to power up the boardsFigure 6. PCA9955BTW-ARD daughterboard / i.MX 8M Mini LPDDR4 EVK board operation
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The PCA9955BTW-ARD daughter board can be operated with another EVK board which has an Arduino port. There are two options to connect the board: using other EVK equipped with an Arduino port and an EVK without Arduino port. In the first case, a firmware shall be developed according with PCA9955B specifications and then simply attach PCA9955BTW-ARD daughter board to the EVK to operate the board. In the second case, using the pin chart of Arduino connectors, make the necessary electrical connections (for power, I2C-bus and control lines) and develop the desired firmware, assuring that it is compliant with IC specifications. Use PCA9955B data sheet to read details about internal registers of the DUT IC and data exchange between internal controller and the EVK. Ensure that the correct electrical connections are accurate and avoid data conflicts on the signal lines, to prevent IC damage.
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In addition to our PCA9955BTW: 16-Channel Fm+ I2C-Bus 57 mA/20 V Constant-Current LED Driver, you may also want to visit:
Freedom pages:
Hardware pages:
Software pages: