سنسور گیرنده مادون قرمز TSOP1738

Description

The TSOP17.. ­ series are miniaturized receivers for infrared remote control systems. PIN diode and preamplifier are assembled on lead frame, the epoxy package is designed as IR filter. The demodulated output signal can directly be decoded by a microprocessor. TSOP17.. is the standard IR remote control receiver series, supporting all major transmission codes.

Features

D Photo detector and preamplifier in one package D Internal filter for PCM frequency D Improved shielding against electrical field

D Low power consumption D High immunity against ambient light D Continuous data transmission possible

Tamb = 25_C Parameter Supply Voltage Supply Current Output Voltage Output Current Junction Temperature Storage Temperature Range Operating Temperature Range Power Consumption Soldering Temperature Test Conditions (Pin 2) (Pin 2) (Pin 3) (Pin 3) Symbol IO Tj Tstg Tamb Ptot Tsd Value Unit mW °C

Tamb = 25_C Parameter Supply y Current ( (Pin 2) ) Supply Voltage (Pin 2) Transmission Distance Test Conditions = 40 klx, sunlight Symbol ISD ISH VS d VOSL Ee min 0.35 Min Typ 0.6 1.0 Max 1.5 5.5 Unit mV mW/m2

= 0, test signal see fig.7, IR diode 400 mA Output Voltage Low (Pin 3) IOSL = 0.5 mA,Ee f = fo, tp/T = 0.4 Irradiance ­ 40 kHz) Pulse width tolerance: tpi 5/fo < tpo < tpi + 6/fo, test signal (see fig.7) Irradiance (56 kHz) Pulse width tolerance: tpi 5/fo < tpo < tpi + 6/fo, test signal (see fig.7) Irradiance tpi 5/fo < tpo < tpi + 6/fo Directivity Angle of half transmission distance

recommended to suppress power supply disturbances The output voltage should not be hold continuously at a voltage below 3.3V by the external circuit.

The circuit of the TSOP17.. is designed in that way that unexpected output pulses due to noise or disturbance signals are avoided. A bandpassfilter, an integrator stage and an automatic gain control are used to suppress such disturbances. The distinguishing mark between data signal and disturbance signal are carrier frequency, burst length and duty cycle. The data signal should fullfill the following condition: Carrier frequency should be close to center frequency of the bandpass (e.g. 38kHz). Burst length should be 10 cycles/burst or longer. After each burst which is between 10 cycles and 70 cycles a gap time of at least 14 cycles is neccessary. For each burst which is longer than 1.8ms a corresponding gap time is necessary at some time in the data stream. This gap time should have at least same length as the burst. to 1400 short bursts per second can be received continuously. Some examples for suitable data format are: NEC Code, Toshiba Micom Format, Sharp Code, RC5 Code, RC6 Code, R­2000 Code, Sony Format (SIRCS). When a disturbance signal is applied to the TSOP17.. it can still receive the data signal. However the sensitivity is reduced to that level that no unexpected pulses will occure. Some examples for such disturbance signals which are suppressed by the TSOP17.. are: DC light (e.g. from tungsten bulb or sunlight) Continuous signal or at any other frequency Signals from fluorescent lamps with electronic ballast (an example of the signal modulation is in the figure below).

IR Signal from Fluorescent Lamp with low Modulation.