TCS3404CS datasheet(10/41 Pages) AMSCO

10 / 41 page

TCS3404, TCS3414

DIGITAL COLOR SENSORS

TAOS137A − APRIL 2011

The LUMENOLOGY

r Company

E 2011, TAOS Inc.

www.taosinc.com

PRINCIPLES OF OPERATION

Analog-to-Digital Converter

The TCS3404/14 contains four integrating analog-to-digital converters (ADC) that integrate the currents from

the four photodiodes (channel 1 through channel 4). Integration of all four channels occurs simultaneously, and

upon completion of the conversion cycle the conversion results are transferred to the channel data registers,

respectively. The transfers are double-buffered to ensure that invalid data is not read during the transfer. After

the transfer, the device automatically begins the next integration cycle.

There are two ways to control the integration cycles: internally timed and externally timed. Internally-timed

integration cycles can either be continuous back-to-back conversions or can be externally triggered as a single

event using the SYNC pin. Externally-timed integrations can be controlled by setting and clearing a register bit

(i.e. ADC_EN in Control Register) using the serial interface, or by 1 or more pulses input to the SYNC pin.

Integration options are configured through the Timing Register (see the Timing Register section for more

information).

Digital Interface

Interface and control of the TCS3404/14 is accomplished through a two-wire serial interface to a set of registers

that provide access to device control functions and output data. The serial interface is compatible with System

Management Bus (SMBus) versions 1.1 and 2.0, and I2C bus Fast-Mode.

The TCS3404/14 device supports a single slave address outlined in Table 1. Additional devices shown in the

Available Options table on page 3 support additional I2C slave addresses for systems requiring more than one

device.

Table 1. Slave Address

SLAVE ADDRESS

SMB ALERT ADDRESS

0111001

0001100

NOTE: The slave and SMB Alert addresses are 7 bits. Please note the SMBus and I2C protocols on the following pages. A read/write bit should

be appended to the slave address by the master device to communicate properly with the device.

Interrupt

Although the ADC channel data registers can be read at any time to obtain the most recent conversion value,

in some applications, periodic polling of the device may not be desirable. For these types of applications, the

device supports a variety of interrupt options allowing the user to configure the device to signal when a change

in light intensity has occurred. High and low threshold registers allow a range of light levels to be defined, outside

of which the device generates an interrupt. A persistence setting allows the user to specify a time duration that

the measured value must remain outside of the defined range before generating an interrupt. The interrupt

function can be assigned to any one of the four ADC color channels. See Interrupt Control Register for more

information on configuring the interrupt functions.

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