InetrfaceProducts NXP / PCA962x

PCA9624, PCA9622 and PCA9626 class library. The PCA9624 is a 8-channel, the PCA9622 is a 16-channel and the PCA9956A is a 24-channel Fm+ I2C-bus 100mA/40V LED driver.

Dependencies:   CompLedDvr

Dependents:   PCA9626_Hello PCA9624_Hello PCA9622_Hello

What is this?

Code for PCA9626, PCA9622 and PCA9624.
24-channel, 16-channel and 8-channel PWM output LED driver component class.

Please refer to the component page for details

Components / PCA9622, PCA9624, PCA9626 : 8, 16 & 24ch LED driver (Voltage switch type)

8, 16 & 24-channel Fm+ I2C-bus 100mA/40 V LED driver

#include "mbed.h"
#include "PCA9626.h"

PCA9626     led_cntlr( p28, p27, 0xC4 );  //  SDA, SCL, Slave_address(option)
LedPwmOut   led( led_cntlr, L0 );

int main()
{
    while( 1 ) {
        for( float p = 0.0f; p < 1.0f; p += 0.1f ) {
            led     = p;
            wait( 0.1 );
        }
    }
}

About the chips

PCA9626

The PCA9626 is an I²C-bus controlled 24-bit LED driver optimized for voltage switch dimming and blinking 100 mA LEDs. Each LED output has its own 8-bit resolution (256 steps) fixed frequency individual PWM controller that operates at 97 kHz with a duty cycle that is adjustable from 0 % to 99.6 % to allow the LED to be set to a specific brightness value.

Datasheet: http://www.nxp.com/documents/data_sheet/PCA9626.pdf

PCA9622

The PCA9622 is an I²C-bus controlled 16-bit LED driver optimized for voltage switch dimming and blinking 100 mA LEDs. Each LED output has its own 8-bit resolution (256 steps) fixed frequency individual PWM controller that operates at 97 kHz with a duty cycle that is adjustable from 0 % to 99.6 % to allow the LED to be set to a specific brightness value.

Datasheet: http://www.nxp.com/documents/data_sheet/PCA9622.pdf

PCA9624

The PCA9624 is an I²C-bus controlled 8-bit LED driver optimized for voltage switch dimming and blinking 100 mA Red/Green/Blue/Amber (RGBA) LEDs. Each LED output has its own 8-bit resolution (256 steps) fixed frequency individual PWM controller that operates at 97 kHz with a duty cycle that is adjustable from 0 % to 99.6 % to allow the LED to be set to a specific brightness value.

Datasheet: http://www.nxp.com/documents/data_sheet/PCA9624.pdf

How the API works?

When the instance is made, all set up for PWM operation are done automatically.
PCA9626, PCA9624 and PCA9622 have internal 97kHz oscillator to generate internal PWM waveform. This signal switchs the output current ON and OFF. The class' function pwm() controls duty-cycle of this output.

Tips for the chips

#include "mbed.h"
 
#include "PCA9622.h"
#include "PCA9626.h"

PCA9622    led0( p28, p27, 0xC0 );    //  SDA, SCL, Slave_address=0xC0 (16-channel chip)
PCA9626    led1( p28, p27, 0xC2 );    //  SDA, SCL, Slave_address=0xC2 (24-channel chip)
 
int main()
{
    led0.pwm( ....    //  PWM control for PCA9955A(16-channel chip)
    led1.pwm( ....    //  PWM control for PCA9956A(24-channel chip)
    ...

Sample code for each types

For PCA9624 (8 channel) : http://developer.mbed.org/users/nxp_ip/code/PCA9624_Hello/
For PCA9622 (16 channel) : http://developer.mbed.org/users/nxp_ip/code/PCA9622_Hello/
For PCA9626 (24 channel) : http://developer.mbed.org/users/nxp_ip/code/PCA9626_Hello/

API of "LedPwmOut class" implemented