HSDL-3020-021 Lite-On Electronics, HSDL-3020-021 Datasheet - Page 23

• Manufacturer Part Number: HSDL-3020-021
• Description: Infrared Transceivers IR Transceiver 4.0Mb/s
• Manufacturer: Lite-On Electronics

Specifications of HSDL-3020-021

• Wavelength: 875 nm
• Continual Data Transmission: 4 Mbit/s
• Transmission Distance: 50 cm
• Radiant Intensity: 10 mW/sr
• Half Intensity Angle Degrees: 30 deg to 60 deg
• Pulse Width: 4 us, 1.6 us
• Maximum Rise Time: 40 ns, 600 ns
• Maximum Fall Time: 40 ns, 600 ns
• Led Supply Voltage: 0 V to 6.5 V
• Maximum Forward Current: 190 mA
• Operating Voltage: 2.4 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 25 C
• Dimensions: 10.4 mm x 2.95 mm x 2.5 mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Transceiver Control I/O Truth Table for Two-TxD Direct Transmission
Mode
SD
0
0
0
0
1
*The shutdown condition will set the transceiver to the default mode
(IrDA-SIR)
Two-TxD Direct Transmission Mode
In the two-TxD direct transmission mode, the IrDA
(875 nm) LED and the remote control (940 nm) LED are
turned on separately by two different input pins. The
TxIR input pin is used to turn on the IrDA (875 nm) LED
while the TxRC input pin is used to turn on the remote
control (940 nm) LED.
Please refer to the Transceiver I/O truth table for more
detail.
TxIR
SD
TxIR TxRC IrDA LED
0
0
1
1
0
50%
0
1
0
1
0
OFF
OFF
ON
–
OFF
t
A
50%
t
C
RC LED
OFF
ON
OFF
–
OFF
t
S
Remarks
IR Rx enabled.
Idle mode
Remote control
operation
IrDA Tx operation
Not recommended
(Both Transmitters off )
Shutdown mode*
50%
t
H
50%
HIGH: MIR/FIR
LOW: SIR
Bandwidth Selection Timing
The power on state should be the IrDA SIR mode. The
data transfer rate must be set by a program-ming se-
quence using the TxD_IR and SD inputs as described
below.
Note: SD should not exceed the maximum, t
down.
Setting to the High Bandwidth MIR/FIR Mode
(0.576 Mbits/s to 4 Mbits/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
4. After waiting t
Setting to the Low Bandwidth SIR Mode
(2.4 kbits/s to 115.2 kbits/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
4. TxIR must be held for t
state 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.
state of TxIR, which determines speed setting).
abled as normal IrDA transmit input for the Low
Bandwidth SIR mode.
H
≥ 50 ns TxD_IR can be set to logic
S
≥ 50 ns. TxIR is now re-en-
C
≤ 5 µs, to prevent shut-
A
S
≥ 50 ns.
≥ 200 ns.
S
≥ 50 ns.