Photo Mosfet Power Module PCM Remote Control Systems Output Active Low

Photo Modules for PCM Remote Control Systems

Description

The HS0038A2. – 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. HS0038A2. is the standard

IR remote control receiver series,

supporting all major transmission codes.

Features

1. Photo detector and preamplifier in one package

2.Internal filter for PCM frequency Improved shielding against electrical field disturbance

3.TTL and CMOS compatibility

4.Output active low Low power consumption

5. High immunity against ambient light

6.Continuous data transmission possible (800 bit/s)

Suitable burst length ≥10 cycles/burst

Block Diagram

Absolute Maximum Ratings T_amb = 25C

Suitable Data Format

The circuit of the HS0038A2. 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 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 be at least 4 times longer than the burst.

• Up to 800 short bursts per second can be received continuously

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