7/31/2019 Design Considerations of TSOP

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Design considerations of TSOP:

For the proper functioning of the Photo module, it is necessary to consider some important aspects.

1. Supply voltage should be + 5 Volts. For this, a 5.1 volt Zener must be connected to the +V pin and ground.

2. A 100 uF capacitor should be connected to the +V pin as a buffer and filter capacitor. This will suppress the

power supply disturbances.

3. Carrier frequency should be close to the center frequency of the band pass filter. 38 kHz in the case of TSOP1738.

4. Burst length must be 10 cycles per burst or more.

5. Between each 10 to 70 cycles, a gap time of 14 cycles is necessary to reset the module.

6. DC lights such as tungsten bulb and daylight affects the functioning of the photo module.

7. Signals from Fluorescent lamps with electronic ballast will affect the working of the photo module.

8. Continuous IR signal (non- pulsed) will disturb the photo module and it will not respond to it.

Photo module design is given in Fig.2

http://electroschematics.com/4338/tsop-1738-photo-module-design-notes-2/clip_image002-16/