TCS3404, TCS3414

DIGITAL COLOR SENSORS

TAOS137A − APRIL 2011

24

r

r

Copyright

E 2011, TAOS Inc.

The LUMENOLOGY

r Company

www.taosinc.com

APPLICATION INFORMATION: SOFTWARE

Synchronization

There are two basic modes of operation for controlling synchronization: (1) internally timed, and (2) 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 the ADC Enable in the Control Register using the serial interface, or by one or more pulses

input to the SYNC pin. Internally-timed integration cycle times are dependent on the PARAM field value and the

internal clock frequency. Nominal integration times and respective scaling between integration times scale

proportionally as shown in the PARAM field in Table 5. See Operating Characteristics Table notes for detailed

information regarding how the scale values were obtained.

If a particular integration time period is required that is not listed in the PARAM Integration Time field value, then

the manual timing control feature can be used to manually start and stop the integration time period by setting

INTEG_MODE=01b. Manual integration is performed as follows:

ADC_EN

Integration Period

Time duration determined by

length of time that ADC_EN = 1

INTERRUPT

AB

Figure 22. Manual Integration (INTEG_MODE 01b)

1.

Disable ADC_EN (= 0) before initiating a manual integration cycle

2.

Clear and enable INTR before each cycle

3.

Write 01b to INTEG_MODE field

4.

Set ADC_EN (= 1) to start integration

5.

Clear ADC_EN ( = 0) to stop integration

6.

Read channel data