TCS3404, TCS3414

DIGITAL COLOR SENSORS

TAOS137A − APRIL 2011

21

The LUMENOLOGY

r Company

r

r

Copyright

E 2011, TAOS Inc.

www.taosinc.com

APPLICATION INFORMATION: SOFTWARE

Basic Operation

to access the control register followed by the data value 03h to the control register to set ADC_EN and POWER

to power up the device. At this point, all four ADC channels will begin a conversion at the default integration time

of 12 ms. After 12 ms, the conversion results will be available in ADC Channel Data Registers (10h through 17h).

The following pseudo code illustrates a procedure for reading the TCS3404/14 device using Word and Byte

transactions:

// Read ADC Channels Using Read Word Protocol − RECOMMENDED

Address = 0x39

Command = 0x80

PowerUp = 0x03

//Power Up and Enable ADC

//Wait for integration conversion

//Address the Ch1 lower data register and configure for Read Word

Command = 0xB0

//Set Command bit and Word transaction

//Reads two bytes from sequential registers 10h and 11h

//Results are returned in DataLow and DataHigh variables

ReadWord (Address, Command, DataLow, DataHigh)

Channel1 = 256 * DataHigh + DataLow

//Address the Ch2 lower data register and configure for Read Word

Command = 0xB2

//Set Command bit and Word transaction

//Reads two bytes from sequential registers 12h and 13h

//Results are returned in DataLow and DataHigh variables

ReadWord (Address, Command, DataLow, DataHigh)

Channel2 = 256 * DataHigh + DataLow //Shift DataHigh to upper byte

//Address the Ch3 lower data register and configure for Read Word

Command = 0xB4

//Set Command bit and Word transaction

//Reads two bytes from sequential registers 14h and 15h

//Results are returned in DataLow and DataHigh variables

ReadWord (Address, Command, DataLow, DataHigh)

Channel3 = 256 * DataHigh + DataLow

//Address the Ch4 lower data register and configure for Read Word

Command = 0xB8

//Set Command bit and Word transaction

//Reads two bytes from sequential registers 16h and 17h

//Results are returned in DataLow and DataHigh variables

ReadWord (Address, Command, DataLow, DataHigh)

Channel4 = 256 * DataHigh + DataLow //Shift DataHigh to upper byte