Expand 11 Click

How does it work?

Expand 11 Click is based on the TCA9536, a general-purpose I/O expander from Texas Instruments. It contains four 4-bit configuration ports alongside an I2C-compatible serial interface. Any four I/Os can be configured by the host MCU as an input or output by writing to the configuration register. During the Power-On sequence, the I/Os are configured as inputs with a weak pull-up to the selected mikroBUS™ power rail. The data for each input or output is kept in the corresponding register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. The TCA9536 outputs (latched) have high-current drive capability for directly driving LEDs.

This Click board™ communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings with a maximum frequency of 1MHz. The Expand 11 Click can also select the function of one of the ports, the P3 port, between its standard I/O and interrupt function. The selection is made by positioning SMD jumpers labeled P3 SEL in an appropriate position marked as I/O or INT. In addition to the jumper setting to the proper place, this function must also be set in the special function register to disable the internal pull-up resistors and P3 override to an INT output.

This Click board™ can operate with either 3.3V or 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

Pinout diagram

This table shows how the pinout on Expand 11 Click 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

Expand 11 Click electrical specifications

Software Support

We provide a library for the Expand 11 Click as well as a demo application (example), developed using Mikroe compilers. The demo can run on all the main Mikroe development boards.

Package can be downloaded/installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for Expand 11 Click driver.

Key functions

• expand11_set_pin_direction This function sets the direction of the selected pins.

• expand11_set_all_pins_value This function sets the value of all output pins.

• expand11_read_port_value This function reads the value of the port input pins.

Example Description

This example demonstrates the use of Expand 11 Click board™ by setting and reading the port state.

void application_task ( void ) 
 { 
     static uint16_t pin_num = EXPAND11_PIN_0_MASK; 
     uint8_t port_value = 0; 
     if ( EXPAND11_OK == expand11_set_all_pins_value( &expand11, pin_num ) ) 
     { 
         if ( EXPAND11_OK == expand11_read_port_value( &expand11, &port_value ) ) 
         { 
             log_printf( &logger, " PORT STATUS rn" ); 
             log_printf( &logger, "  P0: %urn", ( uint16_t ) ( port_value & EXPAND11_PIN_0_MASK ) ); 
             log_printf( &logger, "  P1: %urn", ( uint16_t ) ( ( port_value & EXPAND11_PIN_1_MASK ) >> 1 ) ); 
             log_printf( &logger, "  P2: %urn", ( uint16_t ) ( ( port_value & EXPAND11_PIN_2_MASK ) >> 2 ) ); 
             log_printf( &logger, "  P3: %urnn", ( uint16_t ) ( ( port_value & EXPAND11_PIN_3_MASK ) >> 3 ) ); 
             pin_num = ( ~pin_num ) & EXPAND11_ALL_PINS_MASK; 
         } 
     } 
     Delay_ms( 1000 ); 
 }

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Expand11

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, 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 Mikroe compilers.

mikroSDK

This Click board™ is supported with mikroSDK – Mikroe 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.

For more information about mikroSDK, visit the official page.