TFDT6501E datasheet(9/17 Pages) VISHAY

Part #	TFDT6501E

Description	Fast Infrared Transceiver Module Family (FIR, 4 Mbit/s) for 2.6 V to 5.5 V Operation

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Manufacturer	VISHAY [Vishay Siliconix]

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9 / 17 page

TFDU6101E/TFDS6401/TFDS6501E/TFDT6501E

Vishay Semiconductors

Rev. B1.6, 02–Nov–00

9 (17)

www.vishay.com

Document Number 82525

0

100

200

300

400

500

02468

10

12

14

16

Current Control Resistor (

W )

14379

min. intensity in emission cone

"15

°

max.Rdson, max.VF

max. intensity in

emission cone

"15°

Vcc=4.75V

min. Rdson, min. VF

5.0V

5.25V

Figure 4. Intensity Ie vs. Current Control Resistor R1,

5 V Applications

0

100

200

300

400

500

600

700

02468

10

12

Current Control Resistor (

W )

15111

emission cone

"15°

Vcc=3.0V

min. Rdson, min. VF

3.3V

3.6V

max. intensity in

emission cone

"15°

max. Rdson, max. VF

min. intensity in

Figure 5. Intensity Ie vs. Current Control Resistor R1,

3 V Applications

In addition, when connecting the described circuit to

the power supply, low impedance wiring should be

used.

I/O and Software

In

the

description,

already

different

I/Os

are

mentioned. Differnt 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.

Control: Differences to TFDx6000 Series

For applications using I/Os from NSC, Winbond and TI

no software upgrade is necessary. In combination with

the

latest

SMSC

controllers

for

Microsoft

Windows 98® a software upgrade is necessary,

drivers are available from SMSC and Vishay

Semiconductor GmbH. This software is intended to

work with Windows 95®,

too.

Alternatively

the

HP/ Sharp settings can be selected. The Microsoft

Operating

Systems

NT 5.0®

Beta 2

and

Windows 2000® provide Miniport device drivers.

Mode Switching

The TFDU6101E, TFDS6401, TFDS6501E and

TFDT6501E do not power on with a default mode,

therefore the data transfer rate has to be set by a

programming sequence using the Txd and SD/ Mode

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). When using the Mode Pin, the standby

current may increase to about 50 to 60

mA when high

or low. If not used or in standby mode, the mode input

should float to minimize standby current. The low

frequency mode covers speeds up to 115.2 kbit/s.

Signals 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.

Txd

SD/Mode

ts

th

50%

High : FIR

Low : SIR

50%

14873

Figure 6. Mode Switching Timing Diagram

Setting to the High Bandwidth Mode

(0.576 Mbit/s to 4.0 Mbit/s)

1. Set SD/MODE input to logic “HIGH”.

2. Set Txd input to logic “HIGH”. Wait ts ≥ 200 ns.

3. Set SD/MODE 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

maximum allowed pulse length.

Txd is now enabled as normal Txd input for the high

bandwidth mode.

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