PCA9538 I2C IO Expander
This 8-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 2.3-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)].
Features
- Low Standby Current Consumption of 1 µA Max
- I2C to Parallel Port Expander
- Open-Drain Active-Low Interrupt Output
- Active-Low Reset Input
- Operating Power-Supply Voltage Range of 2.3 V to 5.5 V
- 5-V Tolerant I/O Ports
- 400-kHz Fast I2C Bus
- Two Hardware Address Pins Allow up to Four Devices on the I2C/SMBus
- Input/Output Configuration Register
- Polarity Inversion Register
- Noise Filter on SCL/SDA Inputs
#include "mbed.h"
#include "PCA9538.h"
//PCA9538 MyExpand(p9,p10,0x70,p21);
DigitalOut myled(LED1);
DigitalOut myled2(LED2);
PCA9538PinOut myled3(exp_p4,p9,p10,0x70);
PCA9538PinOut myled4(exp_p7,p9,p10,0x70);
PCA9538PinIn mypuls(exp_p0,p9,p10,0x70);
//void vISRExpand(void);
int main() {
//MyExpand.vInit(0x0F,&vISRExpand);
//MyExpand.vWrite(0x00);
while(1) {
if(mypuls==0){
myled2=1;
wait(0.3);
myled2=0;
wait(0.3);
}else{
myled3=1;
myled4=1;
myled=myled3;
wait(0.5);
myled = 0;
myled3=0;
myled4=0;
wait(0.5);
}
}
}
/*void vISRExpand(void){
myled2=!myled2;
MyExpand.vWrite(MyExpand.cRead()<<4);
}*/
Library:
» Import this library into a programPCA9538_Expander
PCA9538 I2C Expander
Last commit 02 Feb 2011 by 
Ale C.-
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