HSDL-3208-021 datasheet(3/23 Pages) LITEON

Part #	HSDL-3208-021

Description	Ultra Small Profile Package IrDA짰 Data Compliant Low Power 115.2 kbit/s Infrared Transceiver

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Manufacturer	LITEON [Lite-On Technology Corporation]

Direct Link	http://www.liteon.com.tw/databook/default.htm

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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:

1. Set SD/Mode input to logic High.

2. After SD/Mode input remains High at > 25 ns, set

TXD input to logic High, wait ts ≥ 25 ns (from 50%

of TXD rising edge until 50% of SD falling edge).

3. Then set SD/Mode to logic Low. The High to Low

negative edge transition will determine the TX

Power Mode.

4. After waiting for tH ≥ 100 ns, set the TXD input to

logic Low.

5. SD input pulse width for mode selection should be

> 50 ns.

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 ts ≥ 25 ns, set SD/Mode to logic

Low. The High to Low negative edge transition will

determine the TX Power Mode.

4. Ensure that TXD input remains low for tH ≥ 100 ns.

The transmitter is now in High mode.

5. SD input pulse width for mode selection should be

> 50 ns.

Figure 4. Low power mode selection timing diagram.

tS

VIL

VIH

50%

tH

SD/MODE

TXD

VIH

tS

VIL

VIH

50%

tH

SD/MODE

TXD

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