Nexperia Nca95 series User manual

UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

Rev. 1.0 — 4 January 2023 user manual

Document information

Information Content

Keywords General Purpose Input/Output (GPIO) Expander, Evaluation Board (EVB), Arduino™ shield

Abstract The NCA95xx EVB (Evaluation Board) is an Arduino™ compatible shield form factor PCB

designed for the Nexperia I²C controlled GPIO expander family. The board provides convenient

test points for GND, I²C-Bus signals SCL and SDA as well as an interrupt open drain output.

The EVB can be used for the GPIO expander derivatives NCA9555, NCA9535, NCA9539 and

NCA9595.

Nexperia UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

1. Introduction

The NCA95xx EVB (Evaluation Board) is a PCB designed for the Nexperia I²C controlled GPIO

expander family. The EVB arrives enclosed in an antistatic ESD bag with labeling. The board

provides convenient test points for GND, I²C-Bus signals SCL and SDA as well as an interrupt

open drain output. The EVB can be used for the GPIO expander derivatives NCA9555, NCA9535,

NCA9539 and NCA9595.

The EVB is designed in an Arduino™ compatible shield form factor that allows easy development

with Nexperia’s line of available I²C GPIO I/O expanders. There is also supplementary firmware

for the Arduino™ to aid in the development of applications with the NCA95xx family of devices. An

image of the NCA95XX EVB is shown in Fig. 1

Fig. 1. NCA95xx (Arduino™ shield compatible) Evaluation Board

1.1. Features

•EVB name = NCA95xx EVB

•Device = NCA95xx

•Input voltage = 1.6 V to 5.5 V

•I²C to parallel port expansion

•Number of GPIOs = 2 ports with 8 bits

•Current drive capability = ± 25 mA

•I²C interface, Fast-Mode 400 kHz

•Open-drain active-low interrupt output

•Configurable slave address via 3 selection

pins (2 pins for NCA9539)

•Low-active reset input (NCA9539)

•Polarity inversion register (for read

operation)

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Nexperia UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

Further details about the specification and parameters of NCA9555, NCA9535, NCA9539 and

NCA9595 can be found in their respective data sheets, but a high-level summary is provided in

Table 1 below:

Table 1. NCA95xx family features

Device Package Feature

NCA9555PW TSSOP24

NCA9555BY HWQFN24

•integrated 100 kΩ pull-up resistors for GPIO pins

NCA9535PW •no integrated termination of GPIO pins

•advantage: no extra current for active outputs in low state

NCA9595PW •2 additional I²C registers for switchable pull-up resistors

NCA9539PW

TSSOP24

•additional Reset pin (low active) A2 address selection pin is

sacrificed ( 4 address options)

•no internal termination like NCA9535

2. Hardware set up

The proceeding section describes the EVB jumper and header description, installation of firmware

on the Arduino™ UNO board or compatible alternative and installation of the software (GUI) on PC.

2.1. Headers J1/J2/J3/J4 - Arduino™ Uno interface

Headers J1, J2, J3, and J4 serve as the physical interface between the Arduino board and

the EVB. The included software supports fast development and evaluation with the NCA95XX

devices. If using other microcontrollers, or wiring to an application, these headers also allow quick

prototyping by either directly connecting to a breadboard or using wires to directly connect nets to

customer applications.

A detailed description of the header pinouts are listed in the tables presented below:

Table 2. J1 headers

J1 net name Pin number Description

SCL 1 SCL I²C-Bus Signal Line

SDA 2 SDA I²C-Bus Signal Line

GND 4 GND connection

Table 3. J2 headers

J2 net name Pin number Description

3.3 V 4 3.3 V Arduino Supply Voltage

5 V 5 5V Arduino Supply Voltage

GND 6 GND connection

GND 7 GND connection

J3 header has no connections from NCA95XX device. Please reference Arduino pin table.

Table 4. J4 headers

J4 net name Pin number Description

/INT 1 /INT pin (9555)

Add1 2 Addr 1 pin

Add2 3 Addr 2 pin

Add0 4 Addr 0 pin

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Nexperia UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

2.2. Header J5 - selectable VCC

J5 allows a shunt to connect VCC to either 3.3 V or 5 V core voltages. As the Arduino UNO is

native to 5 V, the default option is for the shunt to connect to 5 V supply.

Table 5. J5 header - selectable VCC supply

J5 net name Pin number Description

3.3 V 1 3.3 V from Arduino

VCC 2 Device supply

5 V 3 5 V from Arduino

Note: If using 3.3 V with Arduino UNO, please verify that address connections to Arduino

microcontroller are set to inputs. If setting the Address pins low the digital pin can then be

reconfigured as output and set to LOW. All other I/Os on the NCA95XX are 5 tolerant.

2.3. JP5 and JP6 headers

These headers serve two purposes:

•Additional connection points to VCC, SCL, SDA, GND and other NCA95XX nets

•The EVB can also be evaluated with the Adafruit Trinket M0.

Table 6 and Table 7 display the header pinout with Net connections.

Table 6. JP5 header net names

JP5 net name Pin number Description

GND 2 GND connection

/INT 3 /INT pin (9555)

Add1 4 Addr1 net

Table 7. JP6 header net names

JP6 net name Pin number Description

VCC 1 VCC Supply voltage

SCL 2 SCL I²C-BUS signal line

Add2 3 Addr2 net

2.4. Headers J9/J10/J11 - NCA95XX GPIO

These headers provide direct connection to the GPIO pins of the populated NCA95XX device.

GPIO0 through GPIO7 refer to PORT0, and GPIO10 to GPIO17 refer to PORT1. In the EVB,

PORT1 I/Os are connected to a 300 Ω series resistor and LED. Configuring PORT1 as outputs

through software will allow the user to turn on/off their respective I/O LED.

These components are DNI on PORT0. However, the footprints are included in the case the user

wishes to manually populate. J11 includes a selectable interface between these footprints and a

push button. The push button can be connected to GPIO7 of PORT0.

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Nexperia UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

Table 8. J9 pinout

J9 net name Pin number Description

GPIO0 1 GPIO, DNI Resistor/LED

GPIO1 2 GPIO, DNI Resistor/LED

GPIO2 3 GPIO, DNI Resistor/LED

GPIO3 4 GPIO, DNI Resistor/LED

GPIO4 5 GPIO, DNI Resistor/LED

GPIO5 6 GPIO, DNI Resistor/LED

GPIO6 7 GPIO, DNI Resistor/LED

J11- pin 3 8 GPIO, DNI Resistor/LED

Table 9. J10 pinout

J10 net name Pin number Description

GPIO10 1 GPIO, Populated Resistor/LED

GPIO11 2 GPIO, Populated Resistor/LED

GPIO12 3 GPIO, Populated Resistor/LED

GPIO13 4 GPIO, Populated Resistor/LED

GPIO14 5 GPIO, Populated Resistor/LED

GPIO15 6 GPIO, Populated Resistor/LED

GPIO16 7 GPIO, Populated Resistor/LED

GPIO17 8 GPIO, Populated Resistor/LED

Table 10. J11 pinout

J11 net name Pin number Description

Push-button with

pull-up

1 Connecting shunt to 1-2 of J11 will connect push

button

GPIO07 2 GPIO, DNI resistor/LED

Resistor and LED

footprint

3 Connecting shunt to 2-3 of J11 will connect I/O to

resistor and LED footprint

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Nexperia UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

3. Software Setup

3.1. Installing the Arduino™ software

Download the software files from the EVM product page. The directory should resemble the

following with title “NCA95XX_GUI_Installation_Files”:

Fig. 2. GUI Installation Files

Navigate to the Arduino folder and run “Arduino-1.8.19-windows” or latest Arduino installer

executable. This will download necessary drivers. Once complete, verify properly installed by

verifying “Arduino” program in Start Menu, this is shown in Fig. 3 below.

Fig. 3. Arduino program at startup menu

After the Arduino software is installed, connect the NCA95XX EVB to the Arduino UNO board and

connect the USB cable to PC. Please verify correct VCC is set for the desired operation.

Now navigate in the folder to “NCA95XX_GUI_Installation_Files>Arduino>nca95xx_main” and

click on the “nca95XX_main” file. Once the Arduino IDE is up, select the correct board and port by

clicking into “Tools>Board” and “Tools>Port”, shown in Fig. 4. If the Arduino UNO is connected to

the PC via USB, the PORT information can be found by navigating to the “Device Manager” tool

and verifying port information under “Ports (COM&LPT)”.

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NCA95xx GPIO expander EVB (Arduino™ shield compatible)

Fig. 4. Set Port COM Number

Fig. 5. Device Manager to Find COM port

Next navigate to “Sketch>Upload” to flash the program to the board, this is shown in Fig. 6.

Fig. 6. Uploading the Arduino sketch

If successfully programed, the bottom of the IDE will display “Done uploading”. Now exit the

Arduino IDE.

Fig. 7. Arduino sketch upload complete

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Nexperia UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

3.2. GUI software setup

The next step is to navigate to the “exeInstaller” folder and double-click the “NCA95XX” setup file.

The application is shown below, in Fig. 8, for reference.

Fig. 8. Setup executable for NCA95XX EVB GUI

This will invoke the Installer, which is shown in Fig. 9. Please click next and accept the license

agreements to install the NCA95XX EVM GUI.

Fig. 9. NCA95XX EVB GUI installer screen

After everything installs correctly, you should see the following at your startup menu:

Fig. 10. NCA95XXEVB GUI screen on startup

Clicking on the “NCA95XX EVM GUI” icon will invoke the GUI displayed in Fig. 13.

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Nexperia UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

Fig. 11. NCA95XX GUI program

At startup, the GUI will automatically search for the correct COM PORT that the NCA95XX EVB

and Arduino is connected to – this will take a few seconds. Once connected successfully, the

“Hardware Connected” LED will turn on, indicating that the boards are found. Another LED, “Task

Status” will activate, this LED means that a task is being completed, and will deactivate once the

task is complete. This indicator is similar to the Windows “hourglass” state.

Fig. 12. Hardware Connected and Task Status

After the GUI finds the hardware, and initial routine is executed to find the current state of the

NCA95XX device, the controls and indicators will automatically update and the “Task Status” light

will turn off. After this initial task is performed, the user can now interact with the GUI through

writes/reads or button presses. Additionally, when pressing buttons the “task status” light will turn

on when an operation/task is performed, please wait for this light to turn off before proceeding with

other button presses.

The GUI is split into two different levels of Interaction, shown in Fig. 13. The first Interactive region,

shown in the “Yellow Box” are bit representations of the addresses that control GPIO configuration,

output state, GPIO Read Status and Polarity Inversion. This is meant to serve as a high level of

interaction with the device to manually select GPIO channel features.

The “Orange Box” represents a Lower Level of Interaction by directly writing hexadecimal values to

the Registers. Reads on the registers can also be performed and are updated on their respective

status indicator.

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Nexperia UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

As the two, colored boxes are not directly tied to one another, to properly synchronize the two the

user must press “Read All” to synchronize both blocks if going to and from the other box during

interactive evaluation. Additionally, input port registers 0/1, which represents the GPIO STATUS

LEDs are updated only when the “READ ALL” Button is pressed

Fig. 13. NCA95XX GUI with interactive regions

Pressing the Register number button in the “Orange Box” will update the “Register Field

Description” text shown in the bottom of the GUI. This text is updated with the Register field

description.

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Nexperia UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

GPIO Output example

An example for configuring “P00” as an output and writing a HIGH value is shown in Fig. 14. To

turn the output on change Channel to “OUT” and check “ON/OFF” state, this will turn output on

(high). To force output low, uncheck box for “OFF”.

Fig. 14. GPIO Output example

GPIO Input example

An example for configuring P00 as an input and reading the state of the input the “STATUS” LED is

shown in Fig. 15. Select Channel as “IN” and press “READ ALL” to update “STATUS” LED.

Fig. 15. GPIO Input example

To exit from the GUI, press the “X” icon on the top right of the GUI. To reinvoke the GUI at a later

time navigate back to the startup menu and select the application.

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NCA95xx GPIO expander EVB (Arduino™ shield compatible)

4. Schematic diagram

Fig. 16 shows the schematic diagram of the NCA95xx GPIO expander EVB (Arduino™ shield

compatible).

1 2

3 4

5 6

ICSP

PINHD-2X3

JP5

HEADER-1X576MIL

JP6

HEADER-1X57 6MIL

GND

VCC

SCL

SDA

GND

1 2

10µF

/INT

Add1

Add2

VCC

GND

TP1

5019

TP2

5019

INT

P00

P01

P02

P03

P04

P05

P06

P07

GND

VCC 24

SDA 23

SCL 22

A0 21

P17 20

P16 19

P15 18

P14 17

P13 16

P12 15

P11 14

P10 13

IC1

NCA9555PWR

GND

VCC

GPIO00

GPIO01

GPIO02

GPIO03

GPIO04

GPIO05

GPIO06

GPIO07

GPIO10

GPIO11

GPIO12

GPIO13

GPIO14

GPIO15

GPIO16

GPIO17

Add0

Add2

Add1

/INT

1 2

SDA

SCL

GND

1 2

1µF

Add0

Add1

Add2

VCC

1 2

/INT

1 2

TSW-108-07-T-S

TSW-110-07-T-S

TSW-108-07-T-S

VCC

/INT

Add1

Add2

GND

SCL

SDA

1 2

10µF

TSW-106-07-T-S

TSW-103-07-T-S

VCC

GND

Add0

Selectable VCC

3.3V

Arduino Compatible headers

1 2

LED5

1 2

LED7

1 2

LED9

1 2

LED11

1 2

LED13

1 2

LED15

1 2

LED3

1 2

LED1

1 2

R11

1 2

R13

1 2

R15

1 2

R17

1 2

R19

1 2

R21

GND

GPIO10

GPIO11

GPIO12

GPIO13

GPIO14

GPIO15

GPIO16

GPIO17

GND

1 2

R22

1 2

R20

1 2

R18

1 2

LED6

1 2

LED8

1 2

LED10

1 2

LED12

1 2

LED14

1 2

LED16

1 2

R12

1 2

R14

1 2

R16

1 2

LED4

1 2

LED2

1 2

R10

GPIO00

GPIO01

GPIO02

GPIO03

GPIO04

GPIO05

GPIO06

GPIO07

TSW-108-07-T-S

J10

TSW-108-07-T-S

COM_1

1COM_2 2

NO_1

3NO_2 4

1825910-6

GND

1 2

R23

VCC

J11

TSW-103-07-T-S

PORT 1PORT 0 PORT LEDs and Headers

Fig. 16. NCA95xx EVB schematic diagram

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Nexperia UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

5. PCB layout

Fig. 17 and Fig. 18 depicts the PCB layout of the NCA95xx GPIO expander EVB (Arduino™ shield

compatible). The PCB has two layers, the top layer is shown in red, the bottom layer (ground

plane) is shown in green.

Fig. 17. NCA95xx GPIO expander EVB (Arduino™ shield compatible) top layer PCB layout

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NCA95xx GPIO expander EVB (Arduino™ shield compatible)

Fig. 18. NCA95xx GPIO expander EVB (Arduino™ shield compatible) bottom layer PCB layout

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Nexperia UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

6. Bill of Materials (BOM)

Table 11. Bill of Materials

Component Description Designator Quantity

CC0805KPX5R6BB106 CC0805KPX5R6BB106 C1, C2 2

CC0603KRX7R7BB105 CC0603KRX7R7BB105 C3 1

NCA9555PWR Integrated Circuit IC1 1

PRT-11417 Connector J1,J2,J3,J4 1

TSW-108-07-T-S Connector J9, J10 2

TSW-103-07-T-S Connector J5, J11 2

LTST-C190KRKT LED P10,P11,P12,P13,P14,P15,P16,P17 8

RC0603JR-074K7L RC0603JR-074K7L R1, R2 2

CRCW060310K0JNEAC CRCW060310K0JNEAC R3, R4, R5, R6, R23 5

RC0603JR-07300RL RC0603JR-07300RL R7, R9, R11, R13, R15, R17, R19, R21 8

1825910-6 Switch S1 1

5019 5019 TP1, TP2 2

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NCA95xx GPIO expander EVB (Arduino™ shield compatible)

7. Register Information

7.1. Command byte

In the I²C communication to the GPIO expanders first a command byte must be sent which

points to 8 registers. The values 0x00 to 0x07 are used and supported only. If an illegal value is

transmitted this message is not acknowledged by the NCA95xx.

Table 12. Command byte

Pointer Register bits – NCA95xx

B7 B6 B5 B4 B3 B2 B1 B0

0 0 0 0 0 0 0 0 Input Port 0 Read byte XXXX XXXX

0 0 0 0 0 0 0 1 Input Port 1 Read byte XXXX XXXX

0 0 0 0 0 0 1 0 Output Port 0 R/W byte 1111 1111

0 0 0 0 0 0 1 1 Output Port 1 R/W byte 1111 1111

0 0 0 0 0 1 0 0 Polarity Inv 0 R/W byte 0000 0000

0 0 0 0 0 1 0 1 Polarity Inv 1 R/W byte 0000 0000

0 0 0 0 0 1 1 0 Config Port 0 R/W byte 1111 1111

0 0 0 0 0 1 1 1 Config Port 1 R/W byte 1111 1111

0 0 0 0 1 0 0 0 Pull up Res 0* R/W byte 0000 0000

0 0 0 0 1 0 0 1 Pull up Res 1* R/W byte 0000 0000

Table 12 shows a list of valid command byte values. The registers in the NCA95xx are provided

as pairs for port 0 and port 1 always. Registers 0x00 and 0x01 are read-only registers for the logic

states of the two ports. The next two registers 0x02 and 0x03 define the logic state of an output.

Via the registers 0x04 and 0x05 a mask for polarity inversion of input bits can be defined. Registers

0x06 and 0x07 configure the bits of each port to an input or output. Registers 0x02 to 0x07 can be

written as well as read.

7.2. Input port register pair (0x00, 0x01)

The input port registers return the logic state of the related port pins regardless if a pin is

configured as an input or output. With the readback of output pins, failures in a hardware can be

detected like a short circuit at an output programmed to high level.

Table 13. Input port 0 register (address 0x00)

Bit76543210

Symbol I0.7 I0.6 I0.5 I0.4 I0.3 I0.2 I0.1 I0.0

Default XXXXXXXX

The input port read registers cannot be written. Table 13 and Table 14 show the bit assignment

in the two read registers. The default status X means that there is no power on state. If a read

operation is done after power on without further register changes, the actual state of all GPIOs pins

which are inputs as default state can be derived.

Before starting a read operation the command byte had to be programmed to 0x00. After this the

input port bytes can be read back.

Table 14. Input port 1 register (address 0x01)

Bit76543210

Symbol I1.7 I1.6 I1.5 I1.4 I1.3 I1.2 I1.1 I1.0

Default XXXXXXXX

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Nexperia UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

7.3. Configuration register pair (0x06, 0x07)

With the configuration registers it can be defined if a GPIO pin is an input or an output. As power-

on and default state the ports are defined as inputs. For the NCA9555 all the port pins start with

a logic high state supported from the integrated pull-up resistors unless they are forced to low

state externally. Programming a bit to 0 activates the push-pull stage at the GPIO and the port pin

becomes an output. If a control bit is set to 1, the related GPIO pin works as an input

Table 15. Configuration port 0 register (address 0x06)

Bit76543210

Symbol C0.7 C0.6 C0.5 C0.4 C0.3 C0.2 C0.1 C0.0

Default 11111111

Table 16. Configuration port 1 register (address 0x07)

Bit76543210

Symbol C1.7 C1.6 C1.5 C1.4 C1.3 C1.2 C1.1 C1.0

Default 11111111

7.4. Ouput port register pair (0x00, 0x01)

The Output registers define the logic state of an output. The default state is high level at the output.

Table 17. Output port 0 register (address 0x02)

Bit76543210

Symbol O0.7 O0.6 O0.5 O0.4 O0.3 O0.2 O0.1 O0.0

Default 11111111

Table 18. Output port 1 register (address 0x03)

Bit76543210

Symbol O1.7 O1.6 O1.5 O1.4 O1.3 O1.2 O1.1 O1.0

Default 11111111

7.5. Polarity Inversion register pair (0x04, 0x05)

By means of the Polarity Inversion registers, the logic level of those pins that are defined as inputs

via the Configuration registers can be inverted. The inversion does not effect pins programmed as

outputs. They appear as programmed in non-inverted polarity.

Table 19. Polarity Inversion Port 0 register (address 0x04

Bit76543210

Symbol N0.7 N0.6 N0.5 N0.4 N0.3 N0.2 N0.1 N0.0

Default 00000000

Table 20. Polarity Inversion Port 1 register (address 0x05)

Bit76543210

Symbol N1.7 N1.6 N1.5 N1.4 N1.3 N1.2 N1.1 N1.0

Default 00000000

7.6. Pull Up Resistor register pair (0x08, 0x09)

The Pull Up Resistor registers allow to turn on integrated pull-up resistors in the NCA9595

derivative in the NCA95xx GPIO expander family. In default condition the input pins not teminated

internally, so the device behaves like an xCA9535 from several competitors.

user manual Rev. 1.0 — 4 January 2023 17 / 22

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NCA95xx GPIO expander EVB (Arduino™ shield compatible)

If a GPIO pin is configure as an output, connected pull-up resistors create unnessary power

consumption in logic low state. If a bit in a Pull Up Resistor register is set to 1, the integrated 100

kΩ pull up resistor gets connected to the related port pin.

Table 21. Pull up resistors Port 0 register (address 0x08)

Bit76543210

Symbol P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0

Default 00000000

Table 22. Pull up resistors Port 1 register (address 0x09)

Bit76543210

Symbol P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0

Default 00000000

8. Example Arduino Firmware

Additional example firmware is provided in the software folder. Program “nca95xx_demo.ino” writes

to PORT 1 to flash LEDs back and forth. PORT 0 is continuously read back and byte value is

updated through Arduino IDE. Serial Monitor is used to monitor PORT 0. Pressing the pushbutton

will change the speed of flashing.

9. Revision history

Table 23. Revision history

Revision

number

Date Description

1.0 2023-01-05 Initial version.

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NCA95xx GPIO expander EVB (Arduino™ shield compatible)

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user manual Rev. 1.0 — 4 January 2023 19 / 22

Nexperia UM90016

NCA95xx GPIO expander EVB (Arduino™ shield compatible)

List of Tables

Table 1. NCA95xx family features........................................3

Table 2. J1 headers............................................................. 3

Table 3. J2 headers............................................................. 3

Table 4. J4 headers............................................................. 3

Table 5. J5 header - selectable VCC supply........................4

Table 6. JP5 header net names...........................................4

Table 7. JP6 header net names...........................................4

Table 8. J9 pinout................................................................ 5

Table 9. J10 pinout.............................................................. 5

Table 10. J11 pinout.............................................................5

Table 11. Bill of Materials...................................................15

Table 12. Command byte...................................................16

Table 13. Input port 0 register (address 0x00)................... 16

Table 14. Input port 1 register (address 0x01)................... 16

Table 15. Configuration port 0 register (address 0x06)...... 17

Table 16. Configuration port 1 register (address 0x07)...... 17

Table 17. Output port 0 register (address 0x02)................ 17

Table 18. Output port 1 register (address 0x03)................ 17

Table 19. Polarity Inversion Port 0 register (address 0x04.17

Table 20. Polarity Inversion Port 1 register (address 0x05)17

Table 21. Pull up resistors Port 0 register (address 0x08)..18

Table 22. Pull up resistors Port 1 register (address 0x09)..18

Table 23. Revision history..................................................18

user manual Rev. 1.0 — 4 January 2023 20 / 22

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