NXP PCA9673

The PCA9673 is a 16-bit I2C-bus and SMBus I/O expander with interrupt and reset signals. This driver is implemented in source files pca9673.c/.h and provides communications support with the device over an I²C bus.

Device Information

• [Datasheet] http://www.nxp.com/documents/data_sheet/PCA9673.pdf

Basic Usage

The code snippet below shows how to create an instance of the driver and establish communications with the device.

#include "Drivers/NXP/pca9673.h"
#include <assert.h>

static I2C i2c;                             /* Allocate an I2C port for communicating with the device */
static PCA9673 driver;                      /* Allocate an instance of the driver */

void APP_Example(void)
{
    STATUS status;


    status = I2C_Open(&i2c,                 /* Open the I2C port */
                      0,                    /* Port number (0) */
                      400000);              /* Clock rate (400khz) */

    assert(status == SUCCESS);

    status = PCA9673_Open(&driver,          /* Open the driver */
                          &i2c,             /* Provide the I2C port to be used by the driver */
                          0x48);            /* The address value for the device (A6-A0) */

    assert(status == SUCCESS);
}

The code snippet below shows how to read and write the pins of the device.

#include "Drivers/NXP/pca9673.h"
#include <assert.h>

void APP_Example(void)
{
    STATUS status;
    UINT16 value;


    status = PCA9673_Read(&driver, &value);     /* Read the pins of the device */
    assert(status == SUCCESS);

    status = PCA9673_Write(&driver, value);     /* Write the pins of the device */
    assert(status == SUCCESS);
}