NOA1305

http://onsemi.com

12

Example Programming Sequence

The following pseudo code configures the NOA1305 ambient light sensor and then runs it in an interrupt driven mode. When

the controller receives an interrupt, it reads the ALS_Data from the device, sets a flag and then waits for the main polling loop

to respond to the ambient light change.

external subroutine I2C_Read_Byte (I2C_Address, Data_Address);

external subroutine I2C_Read_Block (I2C_Address, Data_Start_Address, Count, Memory_Map);

external subroutine I2C_Write_Byte (I2C_Address, Data_Address, Data);

external subroutine I2C_Write_Block (I2C_Address, Data_Start_Address, Count, Memory_Map);

subroutine Initialize_ALS () {

MemBuf[0x00] = 0x08;

// POWER_CONTROL assert Power On

MemBuf[0x01] = 0x10;

// RESET assert reset

MemBuf[0x02] = 0x02;

// INTEGRATION_TIME select 200ms

MemBuf[0x03] = 0x01;

// INT_SELECT select Low to High

MemBuf[0x04] = 0xFF;

// INT_THRESH_LSB

MemBuf[0x05] = 0x8F;

// INT_THRESH_MSB

I2C_Write_Block (I2CAddr, 0x00, 6, MemBuf);

}

subroutine I2C_Interupt_Handler () {

// Retrieve and store the ALS data

ALS_Data_LSB = I2C_Read_Byte (I2CAddr, 0x06);

ALS_Data_MSB = I2C_Read_Byte (I2CAddr, 0x07);

NewALS = 0x01;

}

subroutine main_loop () {

I2CAddr = 0x39;

NewALS = 0x00;

Initialize_ALS ();

loop {

// Do some other polling operations

if (NewALS == 0x01) {

NewALS = 0x00;

// Do some operations with ALS_Data

}

}

}