The pin assignment of TSOP 17… series from the front side (projected side) is Pin 1 Ground, Pin 2 + 5V and pin 3 Output. These pins are assigned for +V,–V and output. Output remains high giving + 5 V in the standby state and sinks current when the PIN photodiode receives the modulated IR signals. The collector of this transistor forms the output at pin3 of the module. The demodulated output drives an NPN transistor. The front end of the circuit has a PIN photodiode and the input signal is passed into an Automatic Gain Control(AGC) stage from which the signal passes into a Band pass filter and finally into a demodulator. The photo module has a circuitry inside for amplifying the coded pulses from the IR transmitter. The added features are continuous data transmission up to 2400 bps and suitable burst length of 10 cycles per burst. The important features of the module includes internal filter for PCM frequency, TTL and CMOS compatibility, low power consumption (5 volt and 5 mA), immunity against ambient light, noise protection etc. The demodulated output can be directly decoded by a microprocessor. Its output is active low and gives +5 V when off. Series Photomodules are miniature IR sensor modules with PIN photodiode and a preamplifier stage enclosed in an epoxy case. These IR sensors are designed for improved shielding against electrical field disturbances. TSOP 17… Series Photomodules are excellent Infrared sensors for remote control applications.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |