Mikroelektronika d.o.o.
Expand 14 Klickbrett
Expand 14 Klickbrett
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Key Features
- 16 I/O-Pins, die beim Einschalten standardmäßig als Eingänge fungieren, 5-V-tolerante I/Os, hohe Treiberkapazität, individuelle I/O-Konfiguration, Polaritätsumkehrregister, Interrupt und mehr
- Basierend auf dem CAT9555 – einem universellen I/O-Expander von ON Semiconductor
- Einsetzbar für Sensoren, Netzschalter, LEDs, Drucktaster und Lüfter
- mikroBUS: I2C-Schnittstelle
Overview
Das Expand 14 Click Board™ ist eine kompakte Zusatzplatine, die einen Multiport-E/A-Expander enthält. Diese Platine verfügt über das CAT9555, ein CMOS-Gerät, das eine 16-Bit-Parallel-Eingangs-/Ausgangsanschlusserweiterung von ON Semiconductor bietet. Das CAT9555 enthält zwei 8-Bit-Konfigurationsanschlüsse (Eingang oder Ausgang), Eingangs-, Ausgangs- und Polaritätsumkehrregister sowie eine I2C-kompatible serielle Schnittstelle. Alle 16 E/As können durch Schreiben in das Konfigurationsregister als Eingang oder Ausgang konfiguriert werden. Es verfügt außerdem über einen Active-Low-Interrupt-Ausgang, der dem Host-Controller anzeigt, dass ein Eingangszustand geändert wurde. Dieses Click Board™ bietet eine einfache Lösung, wenn zusätzliche E/As benötigt werden, während die Verbindungen in Systemüberwachungsanwendungen, Industriesteuerungen, tragbaren Geräten und vielem mehr auf ein Minimum beschränkt bleiben.
Das Expand 14 Click Board™ wird von einer mikroSDK-kompatiblen Bibliothek unterstützt, einschließlich Funktionen, die die Softwareentwicklung vereinfachen. Dieses Click Board™ ist ein gründlich getestetes Produkt und kann auf einem System verwendet werden, das mit der mikroBUS™-Buchse ausgestattet ist.
How Does The Expand 14 Click Board™ Work?
The Expand 14 Click Board™ as its foundation uses the CAT9555, a general-purpose I/O expander from ON Semiconductor. It contains two 8-bit configuration ports (input or output), input, output, and polarity inversion registers, alongside an I2C-compatible serial interface, where any of the sixteen I/Os can be configured as an input or output by writing to the configuration register. This port expander represents a simple solution when additional I/Os are needed while keeping interconnections to a minimum; particularly great for sensors, power switches, LEDs, pushbuttons, and fans.
Each I/O port is 5V input tolerant, with a high current I/O drive sink of up to 25mA and an I/O source of up to 10mA, maximum. Additionally, each I/O port is compatible with logic thresholds of 2.5V, 3.3V, and 5V.
The Expand 14 Click Board™ communicates with MCU using the standard I2C 2-Wire interface with a maximum clock frequency of 400kHz. The CAT9555 has a 7-bit slave address with the first four MSBs fixed to 0100. The address pins A0, A1, and A2, are programmed by the user and determine the value of the last three LSBs of the slave address, which can be selected by positioning onboard SMD jumpers labelled as ADDR SEL to an appropriate position marked as 0 or 1.
Besides, it also features an active-low interrupt feature, routed to the INT pin of the mikroBUS™ socket, indicating to the host controller that an input state has been changed.
The Expand 14 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.
SPECIFICATIONS
| Type | Port expander |
| Applications | Can be used for sensors, power switches, LEDs, pushbuttons, and fans |
| On-board modules | CAT9555 - general-purpose I/O expander from ON Semiconductor |
| Key Features | 16 I/O Pins that default to inputs at Power−Up, 5V Tolerant I/Os, high drive capability, individual I/O configuration, polarity inversion register, interrupt, and more |
| Interface | I2C |
| Compatibility | mikroBUS |
| Click board size | L (57.15 x 25.4 mm) |
| Input Voltage | 3.3V or 5V |
PINOUT DIAGRAM
This table shows how the pinout of the Expand 14 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).
| Notes | Pin |  |
Pin | Notes | |||
|---|---|---|---|---|---|---|---|
| NC | 1 | AN | PWM | 16 | NC | ||
| NC | 2 | RST | INT | 15 | INT | Interrupt | |
| NC | 3 | CS | RX | 14 | NC | ||
| NC | 4 | SCK | TX | 13 | NC | ||
| NC | 5 | MISO | SCL | 12 | SCL | I2C Clock | |
| NC | 6 | MOSI | SDA | 11 | SDA | I2C Data | |
| Power Supply | 3.3V | 7 | 3.3V | 5V | 10 | 5V | Power Supply |
| Ground | GND | 8 | GND | GND | 9 | GND | Ground |
ONBOARD SETTINGS AND INDICATORS
| Label | Name | Default | Description |
|---|---|---|---|
| LD1 | PWR | - | Power LED Indicator |
| JP1 | VCC SEL | Left | Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V |
| JP2-JP4 | ADDR SEL | Left | I2C Address Selection 0/1: Left position 0, Right position 1 |
| J1-J2 | P0-P1 | Populated | I/O Expander Ports |
EXPAND 14 CLICK ELECTRICAL SPECIFICATIONS
| Description | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | 3.3 | - | 5 | V |
| Output Current - Source/Sink | - | 10/24 | - | mA |
| Number of I/Os | - | - | 16 | pins |
| Operating Temperature Range | -40 | +25 | +85 | °C |
Software Support
We provide a library for the Expand 14 Click Board™ as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio The package Manager (recommended), downloaded from their LibStock™or found on the MikroE Github account.
Library Description
This library contains API for the Expand 14 Click Board™ driver.
Key functions
-
expand14_set_pin_directionThis function sets the direction of the selected pins. -
expand14_set_all_pins_valueThis function sets the value of all output pins. -
expand14_read_port_valueThis function reads the value of the selected port input pins.
Example Description
This example demonstrates the use of the Expand 14 Click Board™ by setting and reading the ports state.
void application_task ( void )
{
uint8_t port_value = 0;
for ( uint16_t pin_num = EXPAND14_PIN_0_MASK; pin_num <= EXPAND14_PIN_7_MASK; pin_num <<= 1 )
{
expand14_set_all_pins_value( &expand14, pin_num );
expand14_read_port_value( &expand14, EXPAND14_PORT_0, &port_value );
log_printf( &logger, " Status port 0 (output): 0x%.2Xrn", ( uint16_t ) port_value );
expand14_read_port_value( &expand14, EXPAND14_PORT_1, &port_value );
log_printf( &logger, " Status port 1 (input) : 0x%.2Xrnn", ( uint16_t ) port_value );
Delay_ms( 1000 );
}
}
The full application code, and ready to use projects can be installed directly from NECTO Studio The package Manager (recommended), downloaded from ourLibStock™or found on the MikroE Github account.
Other MikroE Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.Expand14
Additional Notes and Information
Depending on the development board you are using, you may need a USB UART Click Board™,USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.
MIKROSDK
The Expand 14 Click Board™ is supported withmikroSDK- MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
Software Support
We provide a library for the Expand 14 Click Board™ as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.
The package can be downloaded/installed directly from NECTO Studio The package Manager (recommended), downloaded from their LibStock™or found on the MikroE Github account.
Library Description
This library contains API for the Expand 14 Click Board™ driver.
Key functions
-
expand14_set_pin_directionThis function sets the direction of the selected pins. -
expand14_set_all_pins_valueThis function sets the value of all output pins. -
expand14_read_port_valueThis function reads the value of the selected port input pins.
Example Description
This example demonstrates the use of the Expand 14 Click Board™ by setting and reading the ports state.
void application_task ( void )
{
uint8_t port_value = 0;
for ( uint16_t pin_num = EXPAND14_PIN_0_MASK; pin_num <= EXPAND14_PIN_7_MASK; pin_num <<= 1 )
{
expand14_set_all_pins_value( &expand14, pin_num );
expand14_read_port_value( &expand14, EXPAND14_PORT_0, &port_value );
log_printf( &logger, " Status port 0 (output): 0x%.2Xrn", ( uint16_t ) port_value );
expand14_read_port_value( &expand14, EXPAND14_PORT_1, &port_value );
log_printf( &logger, " Status port 1 (input) : 0x%.2Xrnn", ( uint16_t ) port_value );
Delay_ms( 1000 );
}
}
The full application code, and ready to use projects can be installed directly from NECTO Studio The package Manager (recommended), downloaded from ourLibStock™or found on the MikroE Github account.
Other MikroE Libraries used in the example:
- MikroSDK.Board
- MikroSDK.Log
- Click.Expand14
Additional Notes and Information
Depending on the development board you are using, you may need a USB UART Click Board™,USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. UART terminal is available in all MikroElektronika compilers.
MIKROSDK
The Expand 14 Click Board™ is supported withmikroSDK- MikroElektronika Software Development Kit. To ensure proper operation of mikroSDK compliant Click board™ demo applications, mikroSDK should be downloaded from the LibStock and installed for the compiler you are using.
Frequently Asked Questions
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