TFBS4711-TR3 Vishay, TFBS4711-TR3 Datasheet - Page 6

• Manufacturer Part Number: TFBS4711-TR3
• Description: Infrared Transceivers SIR 115.2 kbits/s 2.7-5.5V Op Voltage
• Manufacturer: Vishay
• Type: TX/RXr

Specifications of TFBS4711-TR3

• Wavelength: 900 nm
• Continual Data Transmission: 115.2 Kbit/s
• Transmission Distance: 1 m
• Radiant Intensity: 60 mW/sr
• Half Intensity Angle Degrees: 44 deg
• Pulse Width: 2 us
• Maximum Rise Time: 100 ns
• Maximum Fall Time: 100 ns
• Led Supply Voltage: - 0.5 V to 6 V
• Operating Voltage: 2.4 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 25 C
• Dimensions: 6 mm x 3.1 mm x 1.9 mm
• Package: 6SMD
• Maximum Communication Distance: 100(Typ) cm
• Maximum Data Rate: 0.1152 Mbps
• Peak Wavelength: 900(Max) nm
• Operating Supply Voltage: 2.4 to 5.5 V
• Data Rate: 115.2kbs (SIR)
• Idle Current, Typ @ 25° C: 75µA
• Link Range, Low Power: 1m
• Operating Temperature: -30°C ~ 85°C
• Orientation: Side View
• Shutdown: *
• Size: 6mm x 3.1mm x 1.9mm
• Standards: IrPHY 1.2
• Supply Voltage: 2.7 V ~ 5.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TFBS4711
Vishay Semiconductors
Storage
The storage and drying processes for all Vishay transceivers
(TFDUxxxx and TFBSxxx) are equivalent to MSL4.
The data for the drying procedure is given on labels on the
packing and also in the application note “Taping, Labeling,
Storage and Packing”.
RECOMMENDED CIRCUIT DIAGRAM
Operated with a clean low impedance power supply the
TFBS4711 needs no additional external components.
However, depending on the entire system design and board
layout, additional components may be required (see figure 1).
Note
*)
The capacitor C1 is buffering the supply voltage and
eliminates the inductance of the power supply line. This one
should be a Tantalum or other fast capacitor to guarantee the
fast rise time of the IRED current. The resistor R1 is the
current limiting resistor, which may be used to reduce the
operating current to levels below the specified controlled
values for saving battery power.
Vishay’s transceivers integrate a sensitive receiver and a
built-in power driver. The combination of both needs a
careful circuit board layout. The use of thin, long, resistive
and inductive wiring should be avoided. The shutdown input
must be grounded for normal operation, also when the
shutdown function is not used.
www.vishay.com
6
R1 is optional when reduced intensity is used
19261
280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
19295-2
0
V
V
GND
SD
TXD
RXD
2 °C...4 °C/s
IRED
CC
Fig. 2 - Solder Profile, RSS Recommendation
Fig. 3 - Recommended Application Circuit
50
T ≥ 255 °C for 20 s max
T ≥ 217 °C for 50 s max
C1
100
90 s...120 s
R1
R2
[e-mail], [e-mail],
*)
150
For technical questions within your region, please contact one of the following:
C2
Time (s)
200
50 s max.
20 s
V
V
Ground
SD
TXD
RXD
Serial Infrared Transceiver SIR, 115.2 kbit/s,
CC2
CC1
T peak = 260 °C max.
250
, IRED A
2 °C...4 °C/s
300
2.4 V to 5.5 V Operation
350
The inputs (TXD, SD) and the output RXD should be directly
connected (DC - coupled) to the I/O circuit. The capacitor C2
combined with the resistor R2 is the low pass filter for
smoothing the supply voltage. R2, C1 and C2 are optional
and dependent on the quality of the supply voltages V
and injected noise. An unstable power supply with dropping
voltage during transmision may reduce the sensitivity (and
transmission range) of the transceiver.
The placement of these parts is critical. It is strongly
recommended to position C2 as close as possible to the
transceiver pins.
When extended wiring is used as in bench tests the
inductance of the power supply can cause dynamically a
voltage drop at V
able to follow the fast current rise time. In that case another
4.7 µF (type, see table under C1) at V
Under
RF-transmitter antenna on top of the transceiver, we
recommend to protect all inputs by a low-pass filter, as a
minimum a 12 pF capacitor, especially at the RXD port. The
transceiver itself withstands EMI at GSM frequencies above
500 V/m. When interference is observed, the wiring to the
inputs picks it up. It is verified by DPI measurements that as
long as the interfering RF - voltage is below the logic
threshold levels of the inputs and equivalent levels at the
outputs no interferences are expected.
One should keep in mind that basic RF - design rules for
circuits design should be taken into account. Especially
longer signal lines should not be used without termination.
See e.g. “The Art of Electronics” Paul Horowitz, Winfield Hill,
1989, Cambridge University Press, ISBN: 0521370957.
COMPONENT
TABLE 1 - RECOMMENDED APPLICATION
CIRCUIT COMPONENTS
C1
C2
R1
R2
extreme
[e-mail]
Depends on current
RECOMMENDED
0.1 µF, ceramic
47 , 0.125 W
to be adjusted
CC2
4.7 µF, 16 V
EMI
VALUE
. Often some power supplies are not
conditions
CRCW-1206-47R0-F-RT1
VISHAY PART NUMBER
Document Number: 82633
VJ 1206 Y 104 J XXMT
CC2
293D 475X9 016B
as
will be helpful.
Rev. 3.0, 19-Nov-10
placing
CC1
an