Datasheet

TFBR4650
www.vishay.com
Vishay Semiconductors
Rev. 1.4, 08-Apr-2019
2
Document Number: 84597
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FUNCTIONAL BLOCK DIAGRAM
PINOUT
TFBR4650, bottom view
Weight 0.05 g
Definitions:
In the Vishay transceiver datasheets the following
nomenclature is used for defining the IrDA operating modes:
SIR: 2.4 kbit/s to 115.2 kbit/s, equivalent to the basic serial
infrared standard with the physical layer version IrPhy 1.0
MIR: 576 kbit/s to 1152 kbit/s
FIR: 4 Mbit/s
VFIR: 16 Mbit/s
MIR and FIR were implemented with IrPhy 1.1, followed by
IrPhy 1.2, adding the SIR low power standard. IrPhy 1.3
extended the low power option to MIR and FIR and VFIR
was added with IrPhy 1.4. A new version of the standard in
any case obsoletes the former version.
PIN DESCRIPTION
PIN NUMBER SYMBOL DESCRIPTION I/O ACTIVE
1 IREDC IRED cathode, do not connect for standard operation. - -
2V
CC
Power supply, 2.4 V to 3.6 V. This pin provides power for the receiver and
transmitter drive section. Connect V
CC1
via an optional filter.
--
3 GND Ground --
4SD
Shutdown. Logic low at this input enables the receiver, enables the transmitter,
and un-tri-states the receiver output. It must be driven high for shutting down
the transceiver.
IHigh
5RXD
Receiver output. Normally high, goes low for a defined pulse duration with the
rising edge of the optical input signal. Output is a CMOS tri-state driver, which
swings between ground and V
CC
. Receiver echoes transmitter output.
OLow
6TXD
Transmitter data input. Setting this input above the threshold turns on the
transmitter. This input switches the IRED with the maximum transmit pulse width
of about 100 μs.
IHigh
7IREDA
IRED anode, connected via a current limiting resistor to V
CC2
. A separate
unregulated power supply can be used.
--
IRED driver
TXD
SD
GND
V
CC
IREDA
RXD
Tri-state
driver
PD
IRED
ASIC
IREDC
19283
Comparator
Mode
control
Amplier
19284
Pin 1 Pin 7