ASDL-3023-021 Avago Technologies US Inc., ASDL-3023-021 Datasheet - Page 24

• 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

Bandwidth Selection Timing
The power on state should be the IrDA SIR mode.
The data transfer rate must be set by a programming
sequence using the TxD_IR and SD inputs as described
below.
Note: SD should not exceed the maximum, t
prevent shutdown.
Setting to the High Bandwidth MIR/FIR Mode
(0.576Mbits/s to 4Mbits/s)
1. Set SD input to logic “HIGH”. Wait t
2. Set TxD_IR input to logic “HIGH”. Wait t
3. Set SD to logic “LOW” (this negative edge latches state
4. After waiting t
4
of TxD_IR, which determines speed setting).
“LOW”. TxD_IR is now re-enabled as normal IrDA
transmit input for the High Bandwidth MIR/FIR mode.
SD
50%
TxI R
H
≥ 50ns TxD_IR can be set to logic
t
A
50%
t
C
t
S
A
≥ 200ns
50%
t
H
S
≥ 50ns.
C
≤ 5µs, to
50%
High: MIR/FIR
Low: SIR
Setting to the LOW Bandwidth SIR Mode
(2.4kbits/s to 115.2kbits/s)
1. Set SD input to logic “HIGH”.
2. Set TxIR input to logic “LOW”. Wait t
3. Set SD to logic “LOW” (this negative edge latches state
4. TxIR must be held for t
of TxIR, which determines speed setting).
as normal IrDA transmit input for the Low Bandwidth
SIR mode.
S
≥ 50ns. TxIR is now re-enabled
S
≥ 50ns.