TFDU4101 datasheet(8/16 Pages) VISHAY

Part #	TFDU4101

Description	Infrared Transceiver Module (SIR, 115.2 kbit/s) for IrDA Applications

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Manufacturer	VISHAY [Vishay Siliconix]

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178

Document Number 81288

Rev. 1.0, 11-Jul-06

TFDU4101

Vishay Semiconductors

Figure 2 shows an example of a typical application

with a separate supply voltage VS and using the

transceiver with the IRED Anode connected to the

unregulated battery Vbatt. This method reduces the

peak load of the regulated power supply and saves

therefore costs. Alternatively all supplies can also be

tied to only one voltage source. R1 and C1 are not

used in this case and are depending on the circuit

design in most cases not necessary.

In figure 2 an option is shown to operate the transmit-

ter at two different power levels to switch for long

range to low power mode for e.g. saving power for

IrDA application but use the full range specification for

Remote Control. The additional components are

marked in the figure.

For operating at RS232 ports TOIM4232 is recom-

mended as ENDEC.

I/

O and Software

In the description, already different I/Os are men-

tioned. Different combinations are tested and the

function verified with the special drivers available

from the I/O suppliers. In special cases refer to the

I/O manual, the Vishay application notes, or contact

directly Vishay Sales, Marketing or Application.

Current Derating Diagram

Figure 3 shows the maximum operating temperature

when the device is operated without external current

limiting resistor.

Table 2.

Truth table

Figure 2. Typical application circuit.

Grey: Optional for Hi/Low switching.

R2

C2

IRED Anode (1)

IRED Cathode (2)

TXD (3)

RXD (4)

SD (5)

Vcc1 (6)

GND (8)

Vs = 2.8 V

V

dd

Vbatt ≈ 3 V

IRTX

IRRX

IR MODE

R1

Hi/Low

C1

20038

Figure 3. Current Derating Diagram

50

55

60

65

70

75

80

85

90

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

Operating Voltage [V] at duty cycle 20 %

18097

Inputs

Outputs

Remark

SD

TXD

Optical input Irradiance mW/m2

RXD

Transmitter

Operation

high

> 1 ms

x

weakly pulled

(500 k

Ω) to V

CC1

0Shutdown

low

high < 50 µs

x

low active

Ie

Transmitting

high > 50 µs

x

low active

0

Protection is active

low

< 4

high inactive

0

Ignoring low signals below

the IrDA defined threshold for

noise immunity

low

> Min. irradiance Ee

< Max. irradiance Ee

low (active)

0

Response to an IrDA

compliant optical input signal

low

> Max. irradiance Ee

undefined

0

Overload conditions can

cause unexpected outputs

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