4

Figure 2.

DRIVE

IrDA LED

DRIVE

RC LED

DRIVE

IrDA LED

SHUTDOWN

SHUTDOWN

(ACTIVE HIGH)

TxD_IrDA

(ACTIVE HIGH)

TxD_RC

(GND)

RESET

tC

tTL

RC

MODE

tB

tA

tC

• • •

• • •

• • •

Different Remote Control

Configurations for HSDL-3003

The HSDL-3003 can operate in

the single-TXD programmable

mode or the two-TXD direct

transmission mode.

Single-TXD Programmable Mode

In the single-TXD programmable

mode, only one input pin

(TxD_IrDA input pin) is used to

turn on either the 875 nm LED or

the 940 nm LEDs while the

TxD_RC input pin is grounded.

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.

Two-TXD Direct Transmission Mode

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.

Please refer to the Transceiver

I/O truth table for more details.

Transceiver Control I/O Truth Table for Two-TXD Direct Transmission Mode

SD

TXD_IrDA

TXD_RC

IrDA LED

RC LEDs

Remarks

0

0

0

OFF

OFF

IR Rx enabled. Idle mode

0

0

1

OFF

ON

Remote control operation

0

1

0

ON

OFF

IrDA Tx operation

0

1

1

DIM

ON

Not recommended

1

0

0

OFF

OFF

Shutdown mode*

* The shutdown condition will set the transceiver to the default mode (IrDA).