Datasheet

TFBS4711
www.vishay.com
Vishay Semiconductors
Rev. 3.1, 03-Jul-2018
7
Document Number: 82633
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Fig. 4 - Typical Application Circuit
Figure 4 shows an example of a typical application for to
work with a separate supply voltage V
S
and using the
transceiver with the IRED anode connected to the
unregulated battery V
batt
. This method reduces the peak
load of the regulated power supply and saves therefore
costs. Alternatively all supplies can also be tied to only one
voltage source. R1 and C1 are not used in this case and are
depending on the circuit design in most cases not
necessary.
I/O AND SOFTWARE
In the description, already different I/Os are mentioned.
Different 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.
For operating at RS232 ports the ENDECS TOIM4232 or
TOIM5232 is recommended.
Note
• TFBS4711 echoes the TXD signal at the RXD output during
transmission. For communication this signal is to be correctly
ignored by the controller or the software. The echo signal is
implemented for test purposes in mass production
CURRENT DERATING DIAGRAM
Figure 5 shows the maximum operating temperature when
the device is operated without external current limiting
resisor.
Fig. 5 - Current Derating Diagram
19296-2
V
batt
3 V to 3.6 V
V
S
= 3.3 V
V
dd
IRTX
IRRX
IR MODE
R2
C2
IRED Anode
TXD
RXD
SD
GND
V
CC1
50
55
60
65
70
75
80
85
90
2 2.5 3 3.5 4 4.5 5 5.5 6
Operating Voltage (V) at Duty Cycle 20 %
Ambient Temperature (°C)
18097