TFBS6711-TR1 datasheet(8/14 Pages) VISHAY

Part #	TFBS6711-TR1

Description	Low Profile Fast Infrared Transceiver (FIR, 4 Mbit/s) for IrDA Applications

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Manufacturer	VISHAY [Vishay Siliconix]

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TFBS6711

Document Number 84676

Rev. 1.3, 21-Feb-07

Vishay Semiconductors

www.vishay.com

265

Mode Switching

The TFBS6711 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. The low fre-

quency mode covers speeds up to 115.2 kbit/s. Sig-

nals with higher data rates should be detected in the

high frequency 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 programming sequences described

below are required.

Setting to the High Bandwidth Mode

(0.576 Mbit/s to 4 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.

TXD is now enabled as normal TXD input for the high

bandwidth 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.

TXD is now enabled as normal TXD input for the

lower bandwidth mode.

Truth table

Figure 4. Mode Switching Timing Diagram

TXD

SD

ts

th

50 %

High: FIR

Low: SIR

50 %

14873

Inputs

Outputs

SD

TXD

Input irradiance mW/m2

RXD

Transmitter

high

x

weakly pulled

(500 k

Ω)

high

0

low

high

x

low active (echo)

Ie

low

high > 80 µs

x

high

0

low

< 4

high

0

low

> Min. irradiance Ee

in angular range

< Max. irradiance Ee

in angular range

low (active)

0

low

> Max. irradiance Ee

in angular range

x0

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