TFDU6102-TR3 datasheet(10/18 Pages) VISHAY

Part #	TFDU6102-TR3

Description	Fast Infrared Transceiver Module (FIR, 4 Mbit/s) for 2.7 V to 5.5 V Operation

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Manufacturer	VISHAY [Vishay Siliconix]

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Document Number 82550

Rev. 1.6, 05-Dec-05

TFDU6102

Vishay Semiconductors

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.

Mode Switching

The TFDU6102 is in the SIR mode after power on as

a default mode, therefore the FIR data transfer rate

has to be set by a programming sequence using the

TXD and SD inputs as described below or selected by

setting the Mode Pin. The Mode Pin can be used to

statically set the mode (Mode Pin: LOW: SIR, HIGH:

0.576 Mbit/s to 4.0 Mbit/s). If not used or in standby

mode, the mode input should float or should not be

loaded with more than 50 pF. The low frequency

mode covers speeds up to 115.2 kbit/s. Signals with

higher data rates should be detected in the high fre-

quency mode. Lower frequency data can also be

received in the high frequency mode but with reduced

sensitivity.

To switch the transceivers from low frequency mode

to the high frequency mode and vice versa, the pro-

gramming sequences described below are required.

Setting to the High Bandwidth Mode

(0.576 Mbit/s to 4.0 Mbit/s)

1. Set SD input to logic "HIGH".

2. Set TXD input to logic "HIGH". Wait ts ≥ 200 ns.

3. Set SD to logic "LOW" (this negative edge latches

state of TXD, which determines speed setting).

4. After waiting th ≥ 200 ns TXD can be set to logic

"LOW". The hold time of TXD is limited by the maxi-

mum allowed pulse length.

After that TXD is enabled as normal TXD input and

the transceiver is set for the high bandwidth (576 kbit/

s to 4 Mbit/s) mode.

Setting to the Lower Bandwidth Mode

(2.4 kbit/s to 115.2 kbit/s)

1. Set SD input to logic "HIGH".

2. Set TXD input to logic "LOW". Wait ts ≥ 200 ns.

3. Set SD to logic "LOW" (this negative edge latches

state of TXD, which determines speed setting).

4. TXD must be held for th ≥ 200 ns.

After that TXD is enabled as normal TXD input and

the transceiver is set for the lower bandwidth (9.6 kbit/

s to 115.2 kbit/s) mode.

Table 2.

Truth table

Figure 2. Mode Switching Timing Diagram

TXD

SD

ts

th

50 %

High : FIR

Low : SIR

50 %

14873

Inputs

Outputs

SD

TXD

Optical input Irradiance mW/m2

RXD

Transmitter

high

x

weakly pulled

(500 k

Ω) to V

CC1

0

low

high

x

low (active)

Ie

high > 80

μsx

high

0

low

< 4

high

0

low

> Min. irradianceEe

< Max. irradiance Ee

low (active)

0

low

> Max. irradiance Eex

0

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