ASDL-3023 Datasheet, PDF (20/25 Pages) AVAGO TECHNOLOGIES LIMITED – IrDA Data Compliant Low Power 4Mbit/s with Remote Control Infrared Transceiver

General mobile application processor
The transceiver is directly interface with the micropro-
cessor provided its support infrared communication
commonly known as Infrared Communications Port
(ICP). The ICP supports both SIR data rates up to 115.2kps
and sometimes FIR data with data rates up to 4Mbps.
The remote control commands can be sent one of the
available General Purpose IO pins or the UART block
with IrDA functionality. It should be should be observed
that although both IrDA data transmission and Remote
control transmission is possible simultaneously by the
hardware, hence the software is required to resolve this
issue to prevent the mixing and corruption of data while
being transmitted over the free air. The above Figure 3
illustrates a reference interfacing to implement both IR
and RC functionality with ASDL-3023.
VCC
Remote Control Operation
The ASDL-3023 is spectrally suited to universal remote
control transmission function at 940nm typically. Remote
control applications are not governed by any standards,
owing to which there are numerous remote codes
in market. Each of those standards results in receiver
modules with different sensitivities, depending on the
carries frequencies and responsively to the incident light
wavelength. Remote control carrier frequencies are in
the range of 30KHz to 60KHz (for details of some the fre-
quently used carrier frequencies, please refer to AN1314).
Some common carrier frequencies and the correspond-
ing SA-1110 UART frequency and baud rate divisor are
shown in Table 3.
Table 3.
Remote Control Carrier
Frequency (KHz)
30
32,33
36,36.7,38,39.2,40
56
SA-1110 UART
Frequency (KHz)
28.8
32.9
38.4
57.6
Baud Rate
Divisor
8
7
6
4
IOVCC
R1
CX1
GND
CX2
IOVCC
GPIO
IR_RXD
GPIO
IR_TXD
CX5
GND
100Kohm
VLED
R3
100Kohm
GND
CX3
CX4
VCC
GND
IOVCC
TXD_RC
RXD
SD
TXD_IR
VLEDA
HSDL3021
GND
GND
Figure 3. ASDL-3023 configuration with general mobile architecture processor
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