NXP Semiconductors UM11712 User manual

UM11712
PCAL6534EV-ARD evaluation board
Rev. 1.0 — 31 January 2022 User manual
Document information
Information Content
Keywords PCAL6534, I2C-bus, 34-bit I/O bus, Arduino port, EVK
Abstract The PCAL6534EV-ARD evaluation board is a daughter card equipped with
an Arduino port, designated for easy test and design of PCAL6534 IC, 34-bit
port expander, controlled through FM+ I2C 2-wire bus, with RESET. The board
is fully compliant with IMXRT1050 EVK, LPCXpresso55S69 (LPC55S69-
EVK) 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 an Arduino port.

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
Rev Date Description
v.1.0 20220131 Initial version
Revision history
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
2 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
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.
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
3 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
1 Introduction
This document describes the PCAL6534EV-ARD evaluation board. The evaluation
board is built around the PCAL6534, low-voltage translating, 34-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 / motherboards for testing and measuring the characteristics of the PCAL6534
Device Under Test (DUT).
The PCAL6534EV-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 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 five ports. The port P0, P1, P2, and P3 are 8-bit
wide, while P4 has two bits only. The port P0 and P1 controls an on-board four-digit LED
display through the MAX V CPLD (Intel/Altera). The board contains also eight on-board
LEDs and five switches, connected to the I/O pins of the DUT. All I/O lines are shared
with three connectors for external access to the I/O pins.
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 http://www.nxp.com.
The information page for PCAL6534EV-ARD evaluation board is at http://http://
www.nxp.com/PCAL6534EV-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 PCAL6534EV-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 PCAL6534EV-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
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
4 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
•Quick Start Guide
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 PCAL6534EV-ARD features
•I/O connectors for external access to IC input-output pins
•5 user switches connected to I/O pins of the IC
•8 user LEDs connected to I/O pins of the IC
•On-board LED display controlled from the 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 PCAL6534EV-ARD daughterboard (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.
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
5 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
Figure 1. The PCAL6534EV-ARD board picture, top view (up) and bottom view (down)
4.3 Block diagram
Figure 2 shows a block diagram of the PCAL6534EV-ARD daughter board. Alongside
the DUT (U1), the board includes a series of peripherals that assures the operation of the
board. U1 is linked to Arduino interface (J1 to J4) through two busses: the I2C-bus and
the control bus.
The port P0 and P1 (8-bit wide each) controls the four-digit LED display (D13 to D16)
located on the board, through the MAX V CPLD which acts as display decoder/driver. All
16 I/O lines are shared with the 16 BIT I/O PORT (J6).
The port P2 (8-bit wide) is shared with the on-board user LEDs D4 to D11, and the 8 BIT
I/O PORT (J7)
Th first five LSB I/O lines of the port P3 (8-bit wide) are linked to the 10 BIT I/O PORT
(J8) only. The remaining tree lines of P3 and the port P4 (2-bit wide) are shared with on-
board user switches (SW1 to SW4) and the 10 BIT I/O PORT (J8).
The board contains two LDO voltage regulators, for 3.3 V (U3) and 1.8 V (U4), power
rails.
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
6 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
aaa-044875
MAX V
CPLD
#
3
2
16 BIT I/O PORT
PCAL6534
34 BIT I/O
EXPANDER
#16 #16
#
16
#10
#8
SDA
SCL
INTEL
8 BIT I/O PORT
10 BIT I/O PORT
P0_0 to P0_7
P1_0 to P1_7
P2_0 to P2_7
P3_0 to P3_7
P4_0, P4_1
#6
#3
LDO 1 LDO 2
USER LEDs
USER SW
I2C
CONTROL BUS
NXP
U2
J6
J7
J8
U1
U4U3
J1 J2
J3 J4
D13 - D16
D4 D5 D6 D7 D8 D9 D10 D11
SW1 SW2 SW3 SW4 SW5
ARDUINO INTERFACE
3.3V 1.8V
5V
Figure 2. PCAL6534EV-ARD block diagram
4.4 Schematic diagram
The schematic diagram of PCAL6534EV-ARD is available at URL: http://www.nxp.com/
PCAL6534EV-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 daughterboard can
be directly inserted in the Arduino port. The daughterboard uses only five signal lines.
Table 1 shows the pin chart of connectors, and the used lines in the circuit (see also the
SPF-46656.pdf schematic file):
Ref Des # Arduino label PCAL6534EV-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
J2 (analog, digital, I2C) 2 A1 Not used
Table 1. The pin chart of Arduino connectors and their usage
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
7 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
Ref Des # Arduino label PCAL6534EV-ARD function
3 A2 Not used
4 A3 Not used
5 A4 / SDA I2C – SDA
6 A5 / SCL I2C – SCL
1 D0 / RX Not used
2 D1 / TX Not used
3 D2 MAX_CLR
4 D3 / PWM MAX_OE
5 D4 MAX_CTRL_2
6 D5 / PWM MAX_CTRL_1
7 D6 / PWM MAX_CTRL_0
J4 (digital, UART, PWM)
8 D7 MAX_CLK
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. The pin chart of Arduino connectors and their usage...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 PCAL6534EV-ARD board communicates with the host through an I2C-bus (pin
A4 – SCL, pin B3 – 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), Fast-mode (400kHz), and Fast-
mode plus (1MHz). For more details about I2C description and bus transactions, see
PCAL6534 datasheet (https://www.nxp.com/docs/en/data-sheet/PCAL6534.pdf). The
pull-up resistors of the I2C-bus are R43 and R44 (see SPF-46656.pdf schematic file).
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
8 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
4.7 Control bus
The control bus manages RESET, ADDR, and INT pins of the PCAL6534 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
registers in their default state and forces a reinitialization 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 daughterboard. The LED D3 can be deactivated
by removing JP1 jumper. When D3 is inactive (JP1 removed) the open-drain is polarized
through R42. R42 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-46656.pdf schematic file).
4.8 I/O bus
The PCAL6534 IC contains 34 configurable I/O pins, organized in five ports, P0 to P4.
The ports P0 to P3 are 8-bit wide, while P4 is 2-bit wide. P0 and P1 are allocated to the
four-digit LED display (through MAX V CPLD, U2). The port P2 drives the on-board LEDs
(D4 to D11). The on-board user switches SW1 to SW5 are connected to port P3 and P4.
From port P3 the last MSB three lines are allocated to the on-board switches. All I/O lines
of the PCAL6534 IC are linked to the I/O port connectors for external access of the I/
O lines (see the schematic of the daughterboard). Table 2 shows the allocation of the
PCAL6534 I/O lines (U1).
PCAL6534
(U1) pin Direction CPLD (U2) pin LED Switch 16 BIT – I/ O PORT (J6)
8 BIT – I/O
PORT (J7)
10 BIT – I/
O PORT (J9)
P0_0 I/O IO_9 - - 3 - -
P0_1 I/O IO_10 - - 4 - -
P0_2 I/O IO_11 - - 5 - -
P0_3 I/O IO_12 - - 6 - -
P0_4 I/O IO_13 - - 7 - -
P0_5 I/O IO_14 - - 8 - -
P0_6 I/O IO_15 - - 9 - -
P0_7 I/O IO_16 - - 10 - -
P1_0 I/O IO_17 - - 11 - -
P1_1 I/O IO_18 - - 12 - -
P1_2 I/O IO_19 - - 13 - -
P1_3 I/O IO_22 - - 14 - -
P1_4 I/O IO_23 - - 15 - -
Table 2. The I/O allocation table
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
9 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
PCAL6534
(U1) pin Direction CPLD (U2) pin LED Switch 16 BIT – I/ O PORT (J6)
8 BIT – I/O
PORT (J7)
10 BIT – I/
O PORT (J9)
P1_5 I/O IO_24 - - 16 - -
P1_6 I/O IO_25 - - 17 - -
P1_7 I/O IO_26 - - 18 - -
P2_0 Output - D4 - - 2 -
P2_1 Output - D5 - - 3 -
P2_2 Output - D6 - - 4 -
P2_3 Output - D7 - - 5 -
P2_4 Output - D8 - - 6 -
P2_5 Output - D9 - - 7 -
P2_6 Output - D10 - - 8 -
P2_7 Output - D11 - - 9 -
P3_0 I/O - - - - - 3
P3_1 I/O - - - - - 4
P3_2 I/O - - - - - 5
P3_3 I/O - - - - - 6
P3_4 I/O - - - - - 7
P3_5 Input - - SW1 - - 8
P3_6 Input - - SW2 - - 9
P3_7 Input - - SW3 - - 10
P4_0 Input - - SW4 - - 11
P4_1 Input - - SW5 - - 12
Table 2. The I/O allocation table...continued
The on-board LEDs can be disabled by placing JP1 jumper in 2-3 position (OPTION
1, see SPF-46656.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
620 Ω series resistors (R53 – R57), to avoid bus conflict (short-circuit if the line is set
accidentally as output and the switch is pressed).
4.9 CPLD
The PCAL6534EV-ARD board contains a MAX V series CPLD from Intel/Altera (U2,
5M80ZE64C5N). The role of this IC is decoder / driver for the on-board four-digit LED
display (D13 to D16). The CPLD works as signal bridge between the ports P0 and P1
of the PCAL6534 IC and the LED displays. Additionally, a six lines control bus is linked
between MAX V CPLD and the Arduino port. For details, see SPF-46656.pdf schematic
file of PCAL6534EV-ARD daughterboard. The internal firmware of the MAX V CPLD is
controlled from the GUI application through the control bus. The CPLD control bus sets
the operation modes of MAX V CPLD. The MAX_CLK line is not used (IO_5/CLK0 pin of
U2 is masked). Table 3 details the operation modes and the corresponding logic states of
CPLD control bus.
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
10 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
Bus line Direct Write Count Idle
MAX_CLK Not used Not used Not used
MAX_CLR 0 0 1
MAX_OE 0 1 0
MAX_CTRL_0 X [1] Controls the speed
of counting [2] X [1]
MAX_CTRL_1 Controls the indication
of digit 4 (D9) [3] Controls the direction of counting [2] 0
MAX_CTRL_2 X [1] Controls the counting status [2] X [1]
Table 3. CPLD control bus
[1] Don't care
[2] See Section 4.9.2 and Table 4
[3] See Section 4.9.1
4.9.1 Direct write
When this mode is activated, the user can write decimal values from the GUI directly
to the on-board LED display on the PCAL6534EV-ARD board. For the Digit 1, 2, and
3 (D14, D15, and D16), the user can write decimal numbers from 0 to 9. For Digit 4
(D13), the user can set the letter “U” or “d” (the initials of “Up” and “down”). This setting
is realized through the MAX_CTRL_1 (not trough one I/O line of the PCAL6534 IC). The
dots of the digits can be set separately. See Table 4 and Figure 3 for details.
PCAL6534 pin Direct write Count Idle
P0_0
P0_1
P0_2
P0_3
Write decimal numbers from the GUI to
Digit 1 (D16). The PCAL6534 pins are
configured as outputs.
Read the current data from
Digit 1 (D16). The PCAL6534
pins are configured as inputs.
P0_4
P0_5
P0_6
P0_7
Write decimal numbers from the GUI to
Digit 2 (D15). The PCAL6534 pins are
configured as outputs.
Read the current data from
Digit 2 (D15). The PCAL6534
pins are configured as inputs.
P1_0
P1_1
P1_2
P1_3
Write decimal numbers from the GUI to
Digit 3 (D14). The PCAL6534 pins are
configured as outputs. Read the current data from
Digit 3 (D14). The PCAL6534
pins are configured as inputs.
P1_4 Set ON/OFF the dot of Digit 1 (D16)
P1_5 Set ON/OFF the dot of Digit 2 (D15)
P1_6 Set ON/OFF the dot of Digit 3 (D14)
P1_7 Set ON/OFF the dot of Digit 4 (D13)
The PCAL6534 pins are
configured as inputs. The
lines are set in high state in
MAX V.
No action. The MAX V
corresponding pins are in high
Z.
Table 4. MAX V data bus
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
11 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
4.9.2 Count mode
In this mode, an internal counter clocked by the RC oscillator of MAX V counts up and
down, at low speed (clock frequency: 7.6 Hz), or high speed (clock frequency: 61 Hz).
The counting status, direction, and speed are set by the MAX_CTRL_# lines of the
control bus. See Table 5 for MAX_CTRL lines. The current value of the counter is sent
to ports P0 and P1 of the DUT IC (configured as inputs) and displayed in the GUI. The
range of the counter value is from 000 to 999.
Bus line Function State Description
0 Low speed (7.5 Hz)
MAX_CTRL_0 Speed 1 High speed (60 Hz)
0 down
MAX_CTRL_1 Direction 1 up
0 Counter is ON
MAX_CTRL_2 Status 1 Counter is OFF (the counting is stopped)
Table 5. MAX_CTRL_# control lines
4.9.3 Idle mode
In this mode, the internal counter is stopped, the LED display is OFF, except the Digit 4
(D13) which is displaying “-“ (minus) sign (see Figure 3).
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
12 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
Count mode - counting up
Count mode - counting down
Idle mode
Figure 3. PCAL6534EV-ARD on-board LED display
4.10 Jumpers and test points
The board contains two jumpers and several test points. Table 6 and Figure 4 details
the jumper locations and their default configurations. Table 7 describes the test points
located on the PCAL6534EV-ARD board.
Ref Des Label Default Description
1-2: Enable the user LEDs (D4 – D11)
JP1 USER LED - ON / OFF 1-2 2-3: Disable the user LEDs (D4 – D11)
JP2 INT MONITOR – ON / OFF OFF OFF: Disable the interrupt monitor LED (D12)
Table 6. PCAL6534EV-ARD jumpers
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
13 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
Ref Des Label Default Description
ON: Enable the interrupt monitor LED (D12)
Table 6. PCAL6534EV-ARD jumpers...continued
Figure 4. PCAL6534EV-ARD Jumper locations
Ref Des Test point / jumper label Description
TP1 5V 5 V power supply
TP2 3.3V 3.3 V power rail
TP3 1.8V 1.8 V power rail
TP4 GND Ground
TP5 GND Ground
TP6 RST RESET input of PCAL6534 IC
TP7 ADDR ADDR input of PCAL6534 IC
TP8 SDA SDA line (I2C-bus)
TP9 SCL SCL line (I2C-bus)
Table 7. PCAL6534EV-ARD test points
5 Installing and configuring software tools
PCAL6534EV_ARD evaluation board is designed and built as a daughterboard able to
work in conjunction with a motherboard 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 mentioned above 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.
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
14 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
Additionally, a GUI application (Windows 10) is available for download from the NXP
site, allowing rapid testing and operation of PCAL6534EV-ARD daughterboard through
one of above mentioned EVKs. 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
fromwww.nxp.com/. Once the software is installed, the first step is to select the correct
combination EVK – PCAL6534EV-ARD daughter card, and then the board can be
controlled from the GUI interface. SeeSection 6 and Section 7 for more details regarding
the operation of PCAL6534EV-ARD from GUI software.
6 Configuring the hardware
6.1 Using the PCAL6534EV-ARD with an IMXRT1050 EVK board
Figure 5 shows the required hardware for operation of the PCAL6534EV-ARD
daughterboard with IMXRT1050 EVK. The following items are necessary:
•One IMXRT1050-EVK board
•One PCAL6534EV-ARD daughterboard
•One USB-A / USB Micro-B cable
•A PC with Windows 10 operating system
The IMXRT1050 EVK motherboard 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
•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 5) the user can select the power configuration
for the motherboard. For further details, download the IMXRT1050 EVK Board Hardware
User Guide (MIMXRT1050EVKHUG.pdf) available here (link to be set).
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
15 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
Figure 5. PCAL6534EV-ARD daughterboard 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 PCAL6534EV-ARD daughter card on the Arduino connector of the EVK
(see Figure 5).
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 6 shows the boards during the operation.
Figure 6. The assembly PCAL6534EV-ARD daughterboard / IMXRT1050 EVK board operation
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
16 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
6.2 Using the PCAL6534EV-ARD with an LPCXpresso55S69 development
board
Figure 7 shows the required hardware for operation of the PCAL6534EV-ARD and
LPCXpresso55S69 EVK board. This configuration consists of:
•One LPCXpresso55S69 EVK board
•One PCAL6534EV-ARD daughterboard
•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
development board, see the LPCXpresso55S69/LPCXpresso55S28 Development Board
User Manual here.
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
17 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
Figure 7. PCAL6534EV-ARD daughterboard and LPCXpresso55S69 motherboard, before starting
The following steps describe how to assemble, program, and operate the configuration
shown in Figure 7.
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
18 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
1. Insert the PCAL6534EV-ARD daughter card to P16 – P19 connectors located
on LPCXpresso55S69 development board (see the marked pins of P16 – P19,
Figure 7);
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 8 shows the two boards in operation.
Figure 8. PCAL6534EV-ARD daughterboard / LPCXpresso55S69 motherboard operation
6.3 Using the PCAL6534EV-ARD with an i.MX 8M Mini LPDDR4 EVK
board
When an i.MX 8M Mini LPDDR4 EVK board is used with the PCAL6534EV-ARD board, a
third board (IMX8MMINI-IARD interposer board) must be used, especially designed and
built as EVK – daughterboard 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
PCAL6534EV-ARD daughterboard.
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
19 / 31

NXP Semiconductors UM11712
PCAL6534EV-ARD evaluation board
To operate the setup, along with the EVK and the daughterboard, a third board must be
included in the setup assembly. Figure 9 shows the necessary boards and how these
boards are connected. The configuration consists of:
•One i.MX 8M Mini LPDDR4 EVK board
•One PCAL6534EV-ARD daughterboard
•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 PCAL6534EV-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, an 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 9 and
Figure 10).
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 9. The assembly PCAL6534EV-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:
1. Insert the PCAL6534EV-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 9)
UM11712 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 1.0 — 31 January 2022
20 / 31