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U2538B_05 Datasheet, PDF (1/9 Pages) ATMEL Corporation – IR Receiver for Data Communication | |||
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Features
⢠Few External Components
⢠Low Power Consumption
⢠Microcomputer Compatible
⢠Insensitive to Ambient Light and Other Continuous Interferences
Applications
⢠Keyless Entry Systems
⢠Remote Control
⢠Wireless Data Transfer up to 4 kbit/s
IR Receiver for
Data
Communication
1. 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 1-1. Block Diagram with Typical Circuit
VS
U2538B
U2538B
Input
Amplifier
and filter
Detector
µC
Modulated IR signal
carrier frequency 20 to 60 kHz
minimum 6 pulses/burst
AGC/ATC
Rev. 4717BâIRRCâ09/05
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