TFDS6502E 查看數據表（PDF） - Vishay Semiconductors

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TFDS6502E

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

Vishay Semiconductors 

TFDU6102E/TFDS6402/TFDS6502E/TFDT6502E

Vishay Semiconductor

500

5.25V

400 5.0V

300

max. intensity in

emission cone "15°

min. Rdson, min. VF

200

5.0V

100 Vcc=4.75V

max.Rdson, max.VF

min. intensity in emission cone "15°

0

0 2 4 6 8 10 12 14 16

14379

Current Control Resistor ( W )

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

5 V Applications

700

3.6V

600

500

max. intensity in

emission cone "15°

min. Rdson, min. VF

400

3.3V

300

min. intensity in

emission cone "15°

max. Rdson, max. VF

200

3.3V

100

Vcc=3.0V

0

0

2

4

6

8 10 12

15111

Current Control Resistor ( W )

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 TFDU6102E, TFDS6402, TFDS6502E and

TFDT6502E do not power on with a default mode,

therefore the data transfer rate has to be set by a pro-

gramming 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. 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 re-

duced sensitivity. To switch the transceivers from low

frequency mode to the high frequency mode and vice

versa, the programming sequences described below

are required.

SD/Mode

50%

ts

th

High : FIR

Txd

50%

50%

Low : SIR

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.

Document Number 82526

Rev. B1.6, 02–Nov–00

www.vishay.com

9

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