ASDL-3023-021 Avago Technologies US Inc., ASDL-3023-021 Datasheet - Page 23

• Manufacturer Part Number: ASDL-3023-021
• Description: Infrared Transceivers SFF FIR+RC Front w/o Shield
• Manufacturer: Avago Technologies US Inc.

Specifications of ASDL-3023-021

• Wavelength: 885 nm, 875 nm
• Continual Data Transmission: 4 Mbit/s
• Transmission Distance: 30 cm
• Radiant Intensity: 50 mW/sr
• Half Intensity Angle Degrees: 15 deg
• Pulse Width: 4 us, 1.6 us
• Maximum Rise Time: 60 ns, 600 ns
• Maximum Fall Time: 60 ns, 600 ns
• Led Supply Voltage: - 0.3 V to 6 V
• Operating Voltage: 2.4 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 25 C
• Dimensions: 7.5 mm x 2.75 mm x 1.75 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Appendix F: General Application Guide for the ASDL-3023
Remote Control Drive Modes
The ASDL-3023 can operate in the single-TxD program-
mable mode or the two-TxD direct transmission mode.
Single-TxD Programmable Mode
In the single-TxD programmable mode, only one input
pin (TxD_IR input pin) is used to drive the LED in both
IrDA mode as well as Remote Control mode of operation.
This mode can be used when the external controller uses
only one transmit pin for both IrDA as well RC mode of
operation.
transceiver is in default mode (IrDA-SIR) when powered
up. The user needs to apply the following programming
sequence to both the TxD_IR and SD inputs to enable the
transceiver to operate in either the IrDA or remote control
mode.
(GND)
Mode Programming Timing Table
The following timings describe input constraints required using the active serial interface for mode programming with
pins SD, TxIR, and TxRC:

TxRC
Parameter
Shutdown input pulse width, at pin SD
SD mode setup time
TxIR pulse width for RC mode
SD programming pulse width
Note: ( tA + tB ) < tC < tSDPW
TxIR setup time for
SIR or MIR/FIR mode
TxIR or SD hold time to latch
SIR, MIR/FIR or RC mode
(ACTIVE HIGH)
SHUTDOWN
(ACTIVE HIGH)
SHUTDOWN
TxIR
tTL
IrDA LED
DRIVE
tA
Symbol
t
t
t
t
t
t
SDPW
A
B
C
S
H
MODE
RC
tC
tB
Min
0
00
00
-
50
50
tH
Two-TxD Direct Transmission Mode
In the two-TxD direct transmission mode, the LED can
be driven separately for IrDA and RC mode of operation
through the TxD_IR and TxD_RC pins respectively. This
mode can be used when the external controller utilizes
separate transmit pins for IrDA and RC operation modes,
thereby eliminating the need for external multiplexing.
Please refer to the Transceiver I/O truth table for more
detail.
Transceiver Control I/O Truth Table for Two-TxD Direct
Transmission Mode
*
RC LED
tH
DRIVE
SD
0
0
0
0

Typ
-
-
-
-
-
-
The shutdown condition will set the transceiver to the default mode
(IrDA-SIR)
TxIR
0
0


0
Max
∞
-
-
5.0
-
-
RESET
tC
TxRC
0

0

0
Unit
µs
Ns
Ns
µs
Ns
Ns
LED
OFF
ON
ON
-
OFF
IrDA LED
DRIVE
tH
Notes
Will activate
complete shutdown
Setup for mode
programming
RC drive enabled
with pin TxIR
Pulse width mode
programming
Setup time for IrDA
bandwidth selection
Hold time for IrDA or RC modes
Remarks
IR Rx enabled. Idle mode
Remote control operation
IrDA Tx operation
Not recommended
(Both Transmitters off)
Shutdown mode*