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Description
The ACT-IR220VACF is a half-duplex infrared communication processor that encodes RS232
compatible electrical signal pulses to IrDA compatible electrical pulses, and decodes IrDA
compatible electrical pulses to RS232 (needs level converter) pulses, ACT-IR220VACF supports
data baud rate from 9.6Kbps to 115.2Kbps.
The ACT-IR220VACF uses crystal clock 3.6864 MHz for its pulse stretching and shortening. The
IrPHY specification allows two kinds of modulations: 3/16 of a bit duration pulse, or minimum pulse
duration of 1.63 µs, we are using minimum pulse duration of 1.63 µs to modulate bit data.
Features
IrPHY encoding/decoding and interfaces directly to IrDA transceivers.
3.3 V to 5.5 V operating voltage.
Using minimum pulse duration of 1.63 µs to modulate bit data.
Programmable baud clock generator (9600bps to 115.2 Kbps) 5 baud rates.
Low operating current
SOP14 – package
Block Diagram
TXDI
RXDO
/RESET
/MODE
TxDI-Pctrl
RxDo-Pctrl
The Infrared Wireless Expert
Figure 1. Block diagram
Encoder/
Decoder
Baud rate
Generator
Logic
Oscillator
X1
X2
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ACT-IR220VACF
TXDO
RXDI
Nov. 12, 2002
Rev. 1.1.1
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