TCS3200 Datasheet, PDF (9/15 Pages) TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS – COLOR LIGHT-TO-FREQUENCY CONVERTER

TCS3200, TCS3210
PROGRAMMABLE
COLOR LIGHT-TO-FREQUENCY CONVERTER
TAOS099A − AUGUST 2011
APPLICATION INFORMATION
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
lid ^{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
a 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
v _{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
ill ^{present in an area over a given time period.}
PCB Pad Layout
t _{Suggested PCB pad layout guidelines for the D package are shown in Figure 6.}
ms ^{AGtent s 4.65}
6.90
a _{on 1.27}
2.25
c _0.50
l _{NOTES: A. All linear dimensions are in millimeters.}
a _{B. This drawing is subject to change without notice.}
Technic^{Figure 6. Suggested D Package PCB Layout}
Copyright E 2011, TAOS Inc.
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