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参数资料
| 型号： | TFDT4500 |
| 厂商： | Vishay Intertechnology,Inc. |
| 英文描述： | CONNECTOR ACCESSORY |
| 中文描述： | 连接器附件 |
| 文件页数： | 6/12页 |
| 文件大小： | 554K |
| 代理商： | TFDT4500 |
TFDU4100/TFDS4500/TFDT4500
TELEFUNKEN
Semiconductor
Pre-Release Information
6
Pending—Rev. A, 03-Apr-98
unstable power supply with dropping voltage during
transmission may reduce sensitivity (and transmission
range) of the transceiver.
Table 1.
Recommended Application Circuit Components
Component
Recommended Value
C1
100 nF, Ceramic (use 470 nF for less stable power
supplies)
C2
1
μ
F, Tantalum
R1
8.2
, 0.25 W (recommend using two 0.125 W
resistors in parallel)
R2
22 – 47
, 0.125 W
The sensitivity control (SC) pin allows the minimum
detection irradiance threshold of the transceiver to be
lowered when set to a logic HIGH. Lowering the
irradiance threshold increases the sensitivity to infrared
signals and increases transmission range up to 3 meters.
However, setting the SC pin to logic HIGH also makes
the transceiver more susceptible to transmission errors
due to an increased sensitivity to fluorescent light
distrubances. It is recommended to set the SC pin to logic
LOW or left open if the increased range is not required or
if the system will be operating in bright ambient light.
The guide pins on the side-view and top-view packages
are internally connected to ground but should not be
connected to the system ground to avoid ground loops.
They should be used for mechanical purposes only and
should be left floating.
Current Control Resistor, R
l
( )
I
4.75 V, Min. Efficiency,
Min. VF, Max. R
DSon
5.25 V, Min. Efficiency,
Min. VF, Min. R
DSon
IrDA Field of View: Cone of
15
4.0
6.0
8.0
10.0
12.0
14.0
16.0
0
50
100
150
200
250
300
Figure 2.
I
e
vs R
l
e
Shutdown
The internal switch for the IRED in TEMIC SIR
transceivers is designed to be operated like an open
collector driver. Thus, the V
CC2
source can be an
unregulated power supply while only a well regulated
power source with a supply current of 1.3 mA connected
to V
CC1
/SD is needed to provide power to the remainder
of the transceiver circuitry in receive mode. In transmit
mode, this current is slightly higher (approxiamately 4
mA average at 3V supply current) and the voltage is not
required to be kept as stable as in receive mode. A voltage
drop of V
CC1
is acceptable down to about 2.2V when
buffering the voltage directly from the V
CC1
pin to GND
by a 470 nF ceramic capacitor (C1) and a 51
serial
resistor (R2) is used (see figure 1).
This configuration minimizes the influence of high
current surges from the IRED on the internal analog
control circuitry of the transceiver and the application
circuit. Also, board space and cost savings can be
achieved by eliminating the additional linear regulator
normally needed for the IRED’s high current
requirements.
The transceiver can be very efficiently shutdown by
keeping the IRED connected to the power supply V
CC2
but switching off V
CC1
/SD. The power source to
V
CC1
/SD can be provided directly from a microcontroller
(see Figure 3). In shutdown, current loss is realized only
as leakage current through the current limiting resistor to
the IRED (typically, 5 nA). The settling time after
switching V
CC1
/SD on again is approxiamately 50
μ
s.
TEMIC’s TOIM3232 interface circuit is designed for this
shutdown feature. The V
cc
_SD, S0 or S1 outputs on the
TOIM3232 can be used to power the transceiver with the
necessary supply current.
If the microcontroller or the microprocessor is unable to
drive the 1.3-mA supply current required by the
transceiver, a low-cost SOT-23 pnp transistor can be used
to switch voltage on and off from the regulated power
supply (see figure 4). The additional component cost is
minimal and saves the system designer additional power
supply costs.
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相关代理商/技术参数 |
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|---|---|
| TFDT6000-TR3 | 制造商:TEMIC 功能描述: |
| TFDT6500E | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:2.7-5.5V Fast Infrared Transceiver Module Family |
| TFDT6501E | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:Fast Infrared Transceiver Module Family (FIR, 4 Mbit/s) for 2.6 V to 5.5 V Operation |
| TFDT6501E-TR4 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:Fast Infrared Transceiver Module Family (FIR, 4 Mbit/s) for 2.6 V to 5.5 V Operation |
| TFDT6502E | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:Fast Infrared Transceiver Module Family (FIR, 4 Mbit/s) for 2.6 V to 5.5 V Operation |
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