Different Remote Control
Configurations for HSDL-3003
turn on either the 875 nm LED or
the 940 nm LEDs while the
TxD_RC input pin is grounded.
The HSDL-3003 can operate in
the single-TXD programmable
mode or the two-TXD direct
transmission mode.
The transceiver is in default mode
(IrDA) when powered up. User
needs to apply the following
programming sequence to both
the TxD_IrDA and SD inputs to
enable the transceiver to operate
in either the IrDA or remote
control mode.
Single-TXD Programmable Mode
In the single-TXD programmable
mode, only one input pin
(TxD_IrDA input pin) is used to
tC
t
tC
TL
tA tB
SHUTDOWN
(ACTIVE HIGH)
TxD_IrDA
(ACTIVE HIGH)
• • •
• • •
• • •
SHUTDOWN
DRIVE
IrDA LED
RC
MODE
DRIVE
RC LED
RESET
DRIVE
IrDA LED
TxD_RC
(GND)
Figure 2.
Two-TXD Direct Transmission Mode
Transceiver Control I/O Truth Table for Two-TXD Direct Transmission Mode
SD TXD_IrDA TXD_RC IrDA LED RC LEDs Remarks
In the two-TXD direct
transmission mode, the 875 nm
LED and the 940 nm LEDs are
turned on separately by two
different input pins. The
TxD_IrDA input pin is used to
turn on the 875 nm LED while
the TxD_RC input pin is used to
turn on the 940 nm LEDs.
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
IR Rx enabled. Idle mode
Remote control operation
IrDA Tx operation
DIM
OFF
Not recommended
Shutdown mode*
* The shutdown condition will set the transceiver to the default mode (IrDA).
Please refer to the Transceiver
I/O truth table for more details.
4
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