InetrfaceProducts NXP / PCA995xA

PCA9955A and PCA9956A class library. The PCA9955A is a 16-channel and the PCA9956A is a 24-channel Fm+ I2C-bus 57mA/20V constant current LED driver. The PCA9955A has a extended feature which called "Gradation control".

Dependencies:   CompLedDvrCC

Dependents:   PCA9956A_Hello pca9956b_two_demoboards PCA9955A_Gradation_control PCA9955A_Gradation_control ... more

You are viewing an older revision! See the latest version

Homepage

Table of Contents

  1. PCA9955A != PCA9955
  2. Sample code

PCA995xA family

This PCA995xA components library can be used for both PCA9955A(16-channel) and PCA9956A(24-channel).
If you are using both chips on the I2C bus, those can be operated like..

#include "mbed.h"
 
#include "PCA9955A.h"
#include "PCA9956A.h"

PCA9955A    led0( p28, p27, 0xC0 );    //  SDA, SCL, Slave_address=0xC0 (16-channel chip)
PCA9956A    led1( p28, p27, 0xC2 );    //  SDA, SCL, Slave_address=0xC2 (24-channel chip)
 
int main()
{
    led0.current( ALLPORTS, 1.0 ); //  Set all ports output current 100%
    led1.current( ALLPORTS, 1.0 ); //  Set all ports output current 100%

    led0.pwm( ....    //  PWM control for PCA9955A(16-channel chip)
    led1.pwm( ....    //  PWM control for PCA9956A(24-channel chip)
    ...

PCA9955(non-A)

PCA9955A != PCA9955

PCA9955A is not software compatible to PCA9955(non-A version).
There are several differences between A and non-A versions.
Register mapping is one of the difference. Please make sure you are using PCA9955A.

Sample code

For PCA9955A : http://developer.mbed.org/users/nxp_ip/code/PCA9955A_Hello/
For PCA9956A : http://developer.mbed.org/users/nxp_ip/code/PCA9956A_Hello/
For Gradation control of PCA9955A http://developer.mbed.org/users/nxp_ip/code/PCA9955A_Gradation_control/

All wikipages