hsdl-3208 LiteOn Technology Corp., hsdl-3208 Datasheet - Page 3

• Manufacturer Part Number: hsdl-3208
• Description: Ultra Small Profile Package Irda Data Compliant Low Power 115.2 Kbit/s Infrared Transceiver
• Manufacturer: LiteOn Technology Corp.

3
TX Power Mode Switching
The transceiver is in default High TX Power Mode
upon powered on. User needs to apply the following
programming sequence to both SD and TXD inputs
to switch the module to Low TX Power Mode. Both
settings of High TX Power and Low TX Power Mode
can be achieved as follows:
Figure 3. High power mode selection timing diagram.
1. Set SD/Mode input to logic High.
2. TXD input should remain at logic Low.
3. After waiting for t
4. Ensure that TXD input remains low for t
5. SD input pulse width for mode selection should be
SD/MODE
Low. The High to Low negative edge transition will
determine the TX Power Mode.
The transmitter is now in High mode.
> 50 ns.
TXD
50%
t
S
s
25 ns, set SD/Mode to logic
50%
t
H
50%
V
V
IH
IL
V
IL
H
100 ns.
SD/MODE
Figure 4. Low power mode selection timing diagram.
1. Set SD/Mode input to logic High.
2. After SD/Mode input remains High at > 25 ns, set
3. Then set SD/Mode to logic Low. The High to Low
4. After waiting for t
5. SD input pulse width for mode selection should be
TXD input to logic High, wait t
of TXD rising edge until 50% of SD falling edge).
negative edge transition will determine the TX
Power Mode.
logic Low.
> 50 ns.
TXD
50%
t
S
H
100 ns, set the TXD input to
50%
t
H
50%
V
V
IH
IL
s
25 ns (from 50%
V
V
IL
IH