ASDL-3023 datasheet(20/26 Pages) LITEON

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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).TheICPsupportsbothSIRdataratesupto115.2kps

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

withIrDAfunctionality.Itshouldbeshouldbeobserved

that although both IrDA data transmission and Remote

control transmission is possible simultaneously by the

hardware,hencethesoftwareisrequiredtoresolvethis

issuetopreventthemixingandcorruptionofdatawhile

being transmitted over the free air.The above Figure 3

illustrates a reference interfacing to implement both IR

andRCfunctionalitywithASDL-3023.

Remote Control Operation

The ASDL-3023 is spectrally suited to universal remote

controltransmissionfunctionat940nmtypically.Remote

controlapplicationsarenotgovernedbyanystandards,

owing to which there are numerous remote codes

in market. Each of those standards results in receiver

modules with different sensitivities, depending on the

carriesfrequenciesandresponsivelytotheincidentlight

wavelength. Remote control carrier frequencies are in

therangeof30KHzto60KHz(fordetailsofsomethefre-

quentlyusedcarrierfrequencies,pleaserefertoAN1314).

Some common carrier frequencies and the correspond-

ing SA-1110 UART frequency and baud rate divisor are

showninTable3.

Table 3.

Remote Control Carrier

Frequency (KHz)

SA-1110 UART

Frequency (KHz)

Baud Rate

Divisor

28.8

32,33

32.9

36,36.7,38,39.2,40

38.4

57.6

Figure 3. ASDL-3023 configuration with general mobile architecture processor

GND

HSDL3021

GPIO

TXD_RC

RXD

IR_RXD

GPIO

IOVCC

GND

IOVCC

IR_TXD

100Kohm

TXD_IR

VLED

CX4

CX3

VLEDA

IOVCC

CX5

100Kohm

GND

CX1

CX2

VCC

GND

VCC

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