TCS3200 datasheet(14/25 Pages) OSRAM

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[v1-01] 2018-Mar-14

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TCS3200 − Application Information

The output goes high upon the next subsequent pulse of the

principal frequency, beginning a new valid period. This

minimizes the time delay between a change on the input lines

and the resulting new output period. The response time to an

input programming change or to an irradiance step change is

one period of new frequency plus 1μs. The scaled output

changes both the full-scale frequency and the dark frequency

by the selected scale factor.

The frequency-scaling function allows the output range to be

optimized for a variety of measurement techniques. The

scaled-down outputs may be used where only a slower

frequency counter is available, such as low-cost

microcontroller, or where period measurement techniques are

used.

Measuring the Frequency

The choice of interface and measurement technique depends

on the desired resolution and data acquisition rate. For

maximum data-acquisition rate, period-measurement

techniques are used.

Output data can be collected at a rate of twice the output

frequency or one data point every microsecond for full-scale

output. Period measurement requires the use of a fast reference

clock with available resolution directly related to reference

clock rate. Output scaling can be used to increase the resolution

for a given clock rate or to maximize resolution as the light input

changes. Period measurement is used to measure rapidly

varying light levels or to make a very fast measurement of a

constant light source.

Maximum resolution and accuracy may be obtained using

frequency-measurement, pulse-accumulation, or integration

techniques. Frequency measurements provide the added

benefit of averaging out random- or high-frequency variations

(jitter) resulting from noise in the light signal. Resolution is

limited mainly by available counter registers and allowable

measurement time. Frequency measurement is well suited for

slowly varying or constant light levels and for reading average

light levels over short periods of time. Integration (the

accumulation of pulses over a very long period of time) can be

used to measure exposure, the amount of light present in an

area over a given time period.

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