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U2538B Datasheet

  • U2538B

  • IR RECEIVER FOR DATA COMMUNICATION

  • 9頁

  • ATMEL   ATMEL

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Features
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Few External Components
Low Power Consumption
Microcomputer Compatible
Insensitive to Ambient Light and Other Continuous Interferences
Applications
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Keyless Entry Systems
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Remote Control
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Wireless Data Transfer up to 4 kbit/s
Description
The IC U2538B is a complete IR receiver for data communication. The useful input
signals are separated by a special input circuit and amplified by a gain-controlled
amplifier. The bandpass filter suppresses the off-band signals. The signal detector,
consisting of a demodulator, an integrator and a Schmitt trigger, forms the input signal
to an output pulse that can be interfaced to a microcomputer. The AGC and the ATC
circuit control the receiver's sensitivity, making it insensitive to ambient light sources.
Figure 1.
Block Diagram with Typical Circuit
V
S
IR Receiver for
Data
Communication
U2538B
U2538B
Input
Amplifier
and filter
Detector
mC
AGC/ATC
Modulated IR signal
carrier frequency 20 to 60 kHz
minimum 6 pulses/burst
Rev. 4717A鈥揑RRC鈥?5/03
1

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