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

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

High-level API is available

A high-level API that can be used as the "PwmOut" of bed-SDK is available.
This API enables to make instances of each LED output pins and control PWM duty cycle by assignment.
For detail information, refer API document of LedPwmOut Class class which is included in PCA962xA class library.

#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.

API_and_output

Tips for the chips

PCA962x family

This PCA962x components library can be used for all PCA9926(24-channel), PCA9922(16-channel) and PCA9624(8-channel).
If you are using both chips on the I2C bus, those can be operated like..

#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/

Diff: PCA9626/PCA9626.h

Revision:
1:6fcc4f604988
Parent:
0:7a206e6db594
Child:
3:40f83904f0a8
--- a/PCA9626/PCA9626.h	Thu Feb 26 09:16:41 2015 +0000
+++ b/PCA9626/PCA9626.h	Sat Feb 28 23:09:44 2015 +0000
@@ -8,7 +8,7 @@
  *  @version 0.5
  *  @date    26-Feb-2015
  *
- *  Released under the Apache 2 license License
+ *  Released under the Apache 2 license
  *
  *  About PCA9626:
  *    http://www.nxp.com/products/lighting_driver_and_controller_ics/i2c_led_display_control/series/PCA9626.html
@@ -70,7 +70,7 @@
         PWM_REGISTER_START      = PWM0,
     };
 
-    /** Create a PCA9629A instance connected to specified I2C pins with specified address
+    /** Create a PCA9626 instance connected to specified I2C pins with specified address
      *
      * @param i2c_sda       I2C-bus SDA pin
      * @param i2c_sda       I2C-bus SCL pin
@@ -78,7 +78,7 @@
      */
     PCA9626( PinName i2c_sda, PinName i2c_scl, char i2c_address = PCA962x::DEFAULT_I2C_ADDR );
 
-    /** Create a PCA9629A instance connected to specified I2C pins with specified address
+    /** Create a PCA9626 instance connected to specified I2C pins with specified address
      *
      * @param i2c_obj       I2C object (instance)
      * @param i2c_address   I2C-bus address (default: 0xC0)
@@ -104,7 +104,7 @@
      *    'ALLPORTS' can be used to set all port duty-cycle same value.
      * @param v     A floating-point value representing the output duty-cycle,
      *    specified as a percentage. The value should lie between
-     *    0.0f (representing on 0%) and 1.0f (representing on 100%).
+     *    0.0f (representing on 0%) and 1.0f (representing on 99.6%).
      *    Values outside this range will have undefined behavior.
      */
     void            pwm( int port, float v );
@@ -113,7 +113,7 @@
      *
      * @param vp    Aray to floating-point values representing the output duty-cycle,
      *    specified as a percentage. The value should lie between
-     *    0.0f (representing on 0%) and 1.0f (representing on 100%).
+     *    0.0f (representing on 0%) and 1.0f (representing on 99.6%).
      *
      *  @note
      *    The aray should have length of 24