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參數(shù)資料
| 型號： | TFDT6502E-TR3 |
| 廠商： | VISHAY SEMICONDUCTORS |
| 元件分類： | 其它接口 |
| 英文描述： | SPECIALTY INTERFACE CIRCUIT, XMA8 |
| 封裝： | 13 X 7.60 X 5.95 MM, TOP VIEW-8 |
| 文件頁數(shù)： | 18/18頁 |
| 文件大小： | 690K |
| 代理商： | TFDT6502E-TR3 |
TFDU6102E/TFDS6402/TFDS6502E/TFDT6502E
Vishay Semiconductor
Rev. B1.6, 02–Nov–00
9
www.vishay.com
Document Number 82526
0
100
200
300
400
500
02468
10
12
14
16
Current Control Resistor (
W )
14379
Intensity
(mW/sr)
min. intensity in emission cone
"15
°
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
Intensity
(mW/sr)
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 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.
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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