NXP Semiconductors PCAL6416AEV-ARD User manual

UM11704
PCAL6416AEV-ARD evaluation board
Rev. 1.0 — 1 December 2021 User manual
Document information
Information Content
Keywords PCAL6416A, I2C-bus, 16-bit I/O bus, Arduino port, EVK
Abstract The PCAL6416AEV-ARD evaluation board is a daughter card equipped with
Arduino port, designed for easy test and design of PCAL6416A IC, 16-bit
port expander, controlled through FM I2C 2-wire bus, with RESET. The board
is fully compliant with IMXRT1050 EVK, LPCXpresso55S69 (LPC55S69-
ECK) and i.MX 8M Mini LPDDR4 EVK (8MMINILPD4-EVK, 8MMINID4-EVK),
including GUI software control. The board can be attached to any device
equipped with Arduino port.

NXP Semiconductors UM11704
PCAL6416AEV-ARD evaluation board
Rev Date Description
v.1.0 20211201 Initial version
Revision history
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IMPORTANT NOTICE
For engineering development or evaluation purposes only
NXP provides the product under the following conditions:
This evaluation kit is for use of ENGINEERING DEVELOPMENT OR
EVALUATION PURPOSES ONLY. It is provided as a sample IC pre-
soldered to a printed-circuit board to make it easier to access inputs,
outputs and supply terminals. This evaluation board may be used with any
development system or other source of I/O signals by connecting it to the
host MCU computer board via off-the-shelf cables. This evaluation board
is not a Reference Design and is not intended to represent a final design
recommendation for any particular application. Final device in an application
heavily depends on proper printed-circuit board layout and heat sinking
design as well as attention to supply filtering, transient suppression, and I/O
signal quality.
The product provided may not be complete in terms of required design,
marketing, and or manufacturing related protective considerations, including
product safety measures typically found in the end device incorporating the
product. Due to the open construction of the product, it is the responsibility of
the user to take all appropriate precautions for electric discharge. In order to
minimize risks associated with the customers’ applications, adequate design
and operating safeguards must be provided by the customer to minimize
inherent or procedural hazards. For any safety concerns, contact NXP sales
and technical support services.
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1 Introduction
This document describes the PCAL6416AEV-ARD evaluation board. The evaluation
board is built around the PCAL6416A, low-voltage translating, 16-bit I2C-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 with the purpose of testing and measuring the characteristics of
the PCAL6416A Device Under Test (DUT).
The PCAL6416AEV-ARD daughter card communicates through the Arduino port with
the host device via the Fast-mode I2C-bus. Alongside the I2C bus, three additional digital
lines allow the mother board to control the DUT through the same Arduino port.
Power is also delivered from the mother board (EVK) through the Arduino port.
The board contains eight on-board LEDs and eight switches, connected to the I/O pins of
the DUT. The same I/O bus is shared with a connector for external access to the I/O pins.
Additionally, a Graphical User Interface (Windows platform) is provided to facilitate the
evaluation of the daughter board. 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 http://www.nxp.com.
The information page for PCAL6416AEV-ARD evaluation board is at http://http://
www.nxp.com/PCAL6416AEV-ARD. 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 PCAL6416AEV-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 http://community.nxp.com.
3 Getting ready
Working with the PCAL6416AEV-ARD requires the kit contents, additional hardware, and
a Windows PC workstation with installed software.
3.1 Kit contents
•Assembled and tested evaluation board in an antistatic bag
•Quick Start Guide
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3.2 Assumptions
Familiarity with the I2C bus is helpful but not required.
3.3 Static handling requirements
CAUTION
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.
3.4 Minimum system requirements
This evaluation board requires a Windows PC workstation. Meeting these minimum
specifications should produce great results when working with this evaluation board.
•Computer with Windows 10
•One USB port (either 3.0 or 2.0 or 1.1 compatible)
•One of three EVK boards (MIMXRT1050-EVK, LPC55S69-EVK, 8MMINILPD4-EVK)
along with the associated firmware / GUI software
•USB cable for power and data connection between PC and EVK board (if not included
in the EVK package)
4 Getting to know the hardware
4.1 PCAL6416AEV-ARD features
•I/O connector for external access to IC input-output pins
•8 user switches connected to I/O pins of the IC
•8 user LEDs connected to I/O pins of the IC
•Equipped with Arduino Uno R3 port for direct connection with Arduino devices
•Fully compliant with IMXRT1050 EVK board, including GUI (Windows 10)
•Fully compliant with LPCXpresso55S69 dev. board, including GUI (Windows 10)
•Compliant with i.MX Mini LPDDR4 EVK board, including GUI (Windows 10)
Note: For i.MX Mini LPDDR4 EVK Board is necessary to use IMX8MMINI-IARD
interposer board between the EVK and PCAL6416AEV-ARD daughter board (see
IMX8MMINI-IARD User Manual).
4.2 Kit featured components
Figure 1 identifies the main components on the board. The main elements are called out
in the picture. The Arduino port connectors (J1, J2, J3, J4) are located on the bottom side
of the board.
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Figure 1. The PCAL6416AEV-ARD board picture, top view (up) and bottom view (down)
4.3 Block diagram
Figure 2 shows a block diagram of the PCAL6416AEV-ARD daughter board. Alongside
the DUT (U2), the block diagram includes Arduino interface (J1, J2, J3, and J4
connectors), the I/O external connector (J5), the on-board LEDs (D4 to D11), and
switches (SW1 to SW8).
The IC is connected to Arduino interface through two buses: a 3-bit control bus (J3) and
the I2C-bus (J2). The I/O pins are connected to 16-bit I/O port (J5) for direct access from
external. On the I/O digital lines are connected eight LEDs (the P0 port of PCAL6416A
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IC) and eight push button switches (the P1 port). U1 is a 3.3V power rail regulator. The
3.3V power rail provides the power supply, both for PCAL6416A and LEDs.
Figure 2. PCAL6416AEV-ARD block diagram
4.4 Schematic diagram
The schematic diagram of PCAL6416AEV-ARD is available at URL: http://www.nxp.com/
PCAL6416AEV-ARD.
4.5 Arduino port
J1, J2, J3, and J4 are the mated pin headers of Arduino Uno R3 connectors, having the
same electrical function and placed on the board, so that the daughter board can be
directly inserted in the Arduino port. The daughter card is using only five signal lines.
Table 1 represents the pin chart of connectors, and the used lines in the circuit (see also
the SPF-46663.pdf schematic file):
Ref Des # Arduino label PCAL6416AEV-ARD function
1 NC Not used
2 IOREF Not used
3 RESET Not used
4 3.3V Not used
5 5V Power supply
6 GND Power supply return
7 GND Power supply return
J1 (Power)
8 Vin Not used
1 A0 Not used
2 A1 Not used
3 A2 Not used
4 A3 Not used
J2 (analog, digital, I2C)
5 A4 / SDA I2C – SDA
Table 1. Pin chart of Arduino connectors
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Ref Des # Arduino label PCAL6416AEV-ARD function
6 A5 / SCL I2C – SCL
1 D0 / RX Not used
2 D1 / TX Not used
3 D2 Not used
4 D3 / PWM Not used
5 D4 Not used
6 D5 / PWM Not used
7 D6 / PWM Not used
J4 (digital, UART, PWM)
8 D7 Not used
1 D8 RESET (control bus)
2 D9 / PWM ADDR (control bus)
3 D10 / SS / PWM INT (control bus)
4 D11 / MOSI / PWM Not used
5 D12 / MISO Not used
6 D13 / SCK Not used
7 GND Power supply return
8 AREF Not used
9 A4 / SDA Not used
J3 (mixed)
10 A5 / SCL Not used
Table 1. Pin chart of Arduino connectors...continued
The circuit is supplied with 5V from Arduino port through J1 and J3. Pin no. 5 of J1 is 5V
power supply, while pin no. 6, 7 of J1, and pin no. 7 of J3 represents the power supply
return (ground).
4.6 I2C bus
The PCAL6416A communicates with the host through an I2C bus (pin A5 – SCL, pin A4
– SDA). The communication provides internal configuration of the I/O expander, reads
the logic levels of the I/O pins configured as inputs, and sets the logic level on the I/O
pins configured as outputs. The internal configuration of the DUT includes direction of
the digital I/O lines (input or output), polarity inversion, pull-up / pull-down resistor enable,
output strength, output configuration (push-pull or open-drain), input latch configuration,
and interrupt register. The transaction speed of the I2C bus is compliant with Standard-
mode (100kHz), and Fast-mode (400kHz). For more details about I2C description and
bus transactions, see PCAL6416A datasheet (NXP Semiconductors). The pull-up
resistors of the I2C bus are R2 and R3 (see SPF-46663.pdf schematic file).
4.7 Control bus
The control bus manages the RESET, ADDR, and INT pins of the PCAL6416A IC. The
RESET pin is digital input and is controlled by the system host. Its role is to reset the I/
O expander when a time-out or other improper operation occurs. Asserting a low level of
this line forces a reset operation of the internal control section of the IC (puts the internal
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registers in their default state and force a re-initialization of the I2C state machine, in
the same manner as power-on sequence). The RESET pin is controlled by the EVK
motherboard through J3-1 (Arduino port).
The ADDR pin is digital input and represents a programmable hardware address
package which can be asserted low or high, to assign two different slave addresses. The
input is controlled by the EVK through J3-2 (Arduino port).
The INT pin is an open-drain interrupt output, activated when any input state differs from
its corresponding input port register state, indicating to the host system that an input state
has changed. The line is monitored by the EVK through J3-3 Arduino port and locally
by the LED (D3) located on the daughter board. The LED D3 can be deactivated by
removing JP1 jumper. When D3 is inactive (JP1 removed) the open-drain is polarized
through R5. R5 also has the role to compensate the voltage drop of D3 assuring 3.3V
high level in high state of the interrupt line (see SPF-46663.pdf schematic file).
4.8 I/O bus
The port P0 of the DUT is configured as output. The lines drive the on-board LEDs D4
to D11. The P1 port is configured as input. The on-board switches SW1 to SW8 are
connected on the inputs, so that the user can change the logic state from the switches
located on the daughter board. Both ports P0 and P1 are connected to connector J5.
Table 2 shows the configuration of the I/O bus of the PCAL6416AEV-ARD daughter
board.
U2 pin name (number) Wire label On-board LEDs On-board switches I/O ext. conn. (J5)
P0_0 (A1) IO_0 D4 - 3
P0_1 (C3) IO_1 D5 - 4
P0_2 (B1) IO_2 D6 - 5
P0_3 (C1) IO_3 D7 - 6
P0_4 (C2) IO_4 D8 - 7
P0_5 (D1) IO_5 D9 - 8
P0_6 (E1) IO_6 D10 - 9
P0_7 (D2) IO_7 D11 - 10
P1_0 (E3) IO_8 - SW1 11
P1_1 (E4) IO_9 - SW2 12
P1_2 (D3) IO_10 - SW3 13
P1_3 (E5) IO_11 - SW4 14
P1_4 (D4) IO_12 - SW5 15
P1_5 (D5) IO_13 - SW6 16
P1_6 (C5) IO_14 - SW7 17
P1_7 (C4) IO_15 - SW8 18
Table 2. J5 pin chart
The on- board LEDs can be disabled by placing JP2 jumper in 2-3 position (OPTION
1, see SPF-46663.pdf file). This feature is useful when the user uses the board with
external device connected to J5 I/O port. The switches are connected to the bus through
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620Ω series resistors (R15 – R22), to avoid bus conflict (short-circuit if the line is set
accidentally as output and the switch is pressed).
4.9 Jumpers and test points
The board contains two jumpers and several test points. Table 3 and Figure 3 details
the jumper locations and their default configurations. Table 4 describes the test points
located on the PCAL6416AEV-ARD board.
Ref Des Label Default Description
OFF: Disable the interrupt monitor LED (D3)
JP1 INT MONITOR ON / OFF OFF ON: Enable the interrupt monitor LED (D3)
1-2: Enable the user LEDs (D4 – D11)
JP2 USER LED – ON / OFF 1-2 2-3: Disable the user LEDs (D4 – D11)
Table 3. PCAL6416AEV-ARD jumpers
Figure 3. PCAL6416AEV-ARD jumper locations
Ref Des Test point / jumper label Description
TP1 5V The 5V power supply
TP2 3.3V The 3.3V power rail
TP3 GND Ground
Table 4. PCAL6416AEV-ARD test points
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Ref Des Test point / jumper label Description
TP4 GND Ground
TP5 SDA The SDA line (I2C bus)
TP6 SCL The SCL line (I2C bus)
TP7 RST The RESET input of PCAL6416A
TP8 ADDR The ADDR input of PCAL6416A
Table 4. PCAL6416AEV-ARD test points...continued
5 Installing and configuring software tools
PCAL6416A_ARD evaluation board is designed and built as a daughter board 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:
•IMXRT1050 EVK Board;
•LPCXpresso55S69 Development Board;
•i.MX 8M Mini LPDDR4 EVK Board;
Each evaluation / development board benefits by firmware support which can be
downloaded from NXP company site (www.nxp.com/). 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 PCAL6416AEV-ARD daughter board
through the one of above mentioned EVK. The GUI application is common for all three
EVKs and for the PCAL6xxx I/O expander development card family, manufactured
by NXP (PCAL6408A, PCAL6416A, PCAL6524 and PCAL6534 ICs). For details
regarding installation of the EVK firmware and GUI host software on PC please download
EVK_Firmware_And_GUI_Install_Guide_For_Arduino_Boards.pdf instruction file from
NXP site (www.nxp.com/). Once the software is installed, the first step is to select the
correct combination EVK – PCAL6416AEV-ARD daughter card, and then the board
can be controlled from the GUI interface. See Section 6 and Section 7 for more details
regarding the operation of PCAL6416AEV-ARD from GUI software.
6 Configuring the hardware
6.1 Using the PCAL6416AEV-ARD with an IMXRT1050 EVK board
Figure 4 shows the required hardware for operation of the PCAL6416AEV-ARD daughter
board with IMXRT1050 EVK. The following items are necessary:
•One IMXRT1050-EVK board
•One PCAL6416AEV-ARD daughter board
•One USB-A / USB Micro-B cable
•A PC with Windows 10 operating system
The IMXRT1050 EVK mother board can be powered by one of the three methods:
•Connecting an external 5VDC power supply to the barrel power connector (J2) on the
board
•Connecting an USB cable from the PC to the Micro-B USB connector (J9) on the board
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•Connecting an USB cable from the PC to the USB connector (J28) 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 (500mA),
before establishing the communication, use an external power supply (connected to J2).
From J1 on the EVK board (see Figure 4) 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 4. PCAL6416AEV-ARD daughter board and IMXRT1050 EVK board, before starting
To configure the hardware and workstation, complete the following procedure:
1. Configure the suitable power configuration of EVK (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.
2. Insert the PCAL6416AEV-ARD daughter card on the Arduino connector of the EVK
(see Figure 4).
3. Using USB connector J28, connect the EVK board to an USB port of the computer.
4. Install the IMXRT1050 target firmware (download from NXP site and see UM11581,
Arduino Arduino shields GUI and firmware installation manual for step-by-step
instructions).
5. Install GUI application (see UM11581, Arduino shields GUI and firmware installation
manual).
6. Open the GUI application to operate the device from the PC. For details regarding
GUI operation see section 8 “GUI description”.
Figure 5 shows the boards during the operation.
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Figure 5. The assembly PCAL6416AEV-ARD daughter board / IMXRT1050 EVK board operation
6.2 Using the PCAL6416AEV-ARD with an LPCXpresso55S69
development board
Figure 6 shows the required hardware for operation of the PCAL6416AEV-ARD and
LPCXpresso55S69 EVK board. This configuration consists of:
•One LPCXpresso55S69 EVK board
•One PCAL6416AEV-ARD daughter board
•One USB-A / USB Micro-B cable
•A PC with Windows 10 operating system
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
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development board, see the LPCXpresso55S69/LPCXpresso55S28 Development Board
User Manual.
Figure 6. PCAL6416AEV-ARD daughter board and LPCXpresso55S69 mother board, before starting
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The following steps describe how to assemble, program, and operate the configuration
shown in Figure 6.
1. Insert the PCAL6416AEV-ARD daughter card to P16 – P19 connectors located on
LPCXpresso55S69 development board (see the marked pins of P16 – P19, Figure 6)
2. Connect the development board using port P6 USB port of PC
3. Install the LPCXpresso55S69 target firmware (download from NXP site and read the
EVK_Firmware_And_GUI_Install_Guide_For_Arduino_Boards.pdf instruction file)
4. Install GUI application on PC (see the instruction file called out in the previous step)
5. Open the GUI application to operate the device from the PC. For details regarding
GUI operation see Section 7
Figure 7 shows the two boards in operation.
Figure 7. PCAL6416AEV-ARD daughter board / LPCXpresso55S69 mother board operation
6.3 Using the PCAL6416AEV-ARD with an i.MX 8M Mini LPDDR4 EVK
board
When an i.MX 8M Mini LPDDR4 EVK board is used with the PCAL6416AEV-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
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on the i.MX 8M Mini LPDDR4 EVK and the mated connectors of the Arduino port present
on the PCAL6416AEV-ARD daughter board.
To operate the setup, along with the EVK and the daughter board, a third board must be
included in the setup assembly. Figure 8 shows the necessary boards and how these
boards are connected. The configuration consists of:
•One i.MX 8M Mini LPDDR4 EVK board
•One PCAL6416AEV-ARD daughter board
•One IMX8MMINI-IARD interposer board
•One USB-A / USB-C cable
•One USB-A / USB Micro-B cable
•A PC with Windows 10 operating system
It is recommended to attach the PCAL6416AEV-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 an USB port on the PC to debug port (J901) on the EVK (see Figure 8 and Figure 9.
The user may find details regarding power-up and operation of the setup assembly in
8MMINILPDDR4-EVK user manual and IMX8MMINI-IARD User Manual. The files can be
downloaded from www.nxp.com/.
Figure 8. The assembly PCAL6416AEV-ARD daughter board, IMX8MMINI-IARD interposer board, and i.MX 8M Mini
LPDDR4 EVK, before starting
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To configure and operate the setup, follow the below steps:
1. Insert the PCAL6416AEV-ARD onto the IMX8MMINI-IARD interposer board Arduino
connectors (located on the top side)
2. Attach IMXMMINI-IARD connector plug 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 8)
3. Power-up the EVK board using an USB Type C cable attached to PORT 2
4. Connect the EVK to the PC, using an USB Micro-B cable, attached to J901 debug
port
5. Place SW101 in ON position to power-up the boards
6. Install the MIMXRT1050 target firmware (download UM11581, Arduino shields GUI
and firmware installation manual from NXP site)
7. Install GUI application on the PC (see the instruction file referred in the above step)
8. Open the GUI application to operate the device from the PC. For details regarding
GUI operation see Section 7
Figure 9. PCAL6416AEV-ARD daughter board / i.MX 8M Mini LPDDR4 EVK board operation
6.4 Using PCAL6416AEV-ARD with another device
The PCAL6416AEV-ARD daughter board can be operated with other 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 PCAL6416A specifications, and then simply
attach PCAL6416AEV-ARD daughter board to the EVK, to operate the board. In the
second case, using the pin chart of Arduino connectors (Table 1), make the necessary
electrical connections (for power, I2C-bus and control lines), and develop the desired
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firmware, assuring that is compliant with IC specifications. Use PCAL6416A datasheet to
read details about internal registers of the DUT IC and data exchange between internal
controller and the EVK. Assure for correct electrical connections and avoid data conflicts
on the signal lines, to prevent IC damage.
7 GUI description
A GUI application is available for the three EVK boards from NXP Semiconductors. The
application is common for all EVKs and the development boards of the entire family of IO
expanders produced by NXP Semiconductors (PCAL6408A-ARD, PCAL6416AEV-ARD,
PCAL6524EV-ARD, and PCAL6534EV-ARD).
This section describes the GUI application and how the user can control the
PCAL6416AEV-ARD daughter board from the graphical interface. First, install the GUI
package and software on the PC (Windows 10). For more details, see UM11581.
Once installation is complete, assure that one of the mentioned three EVKs with attached
PCAL646408A-ARD daughter board is connected to PC and powered-on. Open
NXP_(PCAL65x4,PCAL64xxA) GUI application. An interface will appear as is shown in
Figure 10:
The GUI application starts with Settings tab (marked with red arrow). The left side of the
window displays Board settings. The section provides the following settings:
• Select EVK: displays the list of EVKs. Selecting a wrong EVK board causes the
connection to fail and a pop-up window with the message: “Unable to Connect with
EVK” appears on the screen.
• Select COM port: displays port selected for the communication. The port is
automatically selected by the system (in the picture is COM 3).
• Select Board: allows the user to select the correct daughter board (the application
can support four different boards). In Figure 10, the selected board is PCAL6416A.
Selecting a wrong daughter board causes the connection to fail and a pop-up window
with the message: “Unable to Connect with Daughter Card” appears on the screen.
In the right side of the window is located Device setting section. The following settings
are provided:
• I2C Frequency: displays the I2C-bus clock frequency (100kHz and 400kHz). With the
Set button the value is written in the internal register of PCAL6416A IC.
• Address Selection: allows the user to select the hardware address of PCAL6416A.
• Reset Chip: reset the internal register of PCAL6416A.
Assuming the correct parameters are chosen, clicking the Connect button establishes
the connection with the EVK. In the bottom side of the GUI window a status bar shows in
real time the status regarding connection between PC and the EVK.
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NXP Semiconductors UM11704
PCAL6416AEV-ARD evaluation board
Figure 10. Graphical interface at start-up (“settings” tab activated by default)
Clicking on SWITCH tab, a new window appears (see Figure 11). In the left side of the
window, the parameters of the IO connected to on-board switches (SW1 to SW4) can be
set. The parameters are:
• Latch: enable / disable the corresponding latch of the input.
• Pull Up/Down Enable: enable / disable the internal pull-up or pull-down resistor.
• Pull UP/Down Selection: select the internal pull-up or pull-down resistor.
• Interrupt Mask: enable / disable the interrupt mask for the input;
• Polarity Inversion: enable / disable the polarity inversion function for the input;
The Write button sets the internal registers of the DUT with the selected value in the GUI.
The switches on-board switches (SW1 to SW8) does not have pull-up resistors, the user
should select and activate the internal pull-up resistors from the GUI. In the right side
of the window, the Read button, bring the status of the registers on the graphical user
interface.
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NXP Semiconductors UM11704
PCAL6416AEV-ARD evaluation board
Figure 11. Graphical interface – “SWITCH” tab activated
The LED tab, allows the user to control the on-board user LEDs D4 to D11 (see
Figure 12). In the yellow area of the window, the parameters of the IO connected to on-
board user LEDs can be set. The parameters are:
• Value: set the status of the on-board user LED (the logic state of the output).
• Output drive strength: sets the drive strength of the output.
The Write button sets the internal registers of the DUT with the selected value in the GUI.
In the upper side of the window (the blue region) the LED1 to LED8 indicators displays
the current state of the on-board LEDs (D4 to D11).
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