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PDA 05 5/30/03 11:35 AM Page 53
Chapter 5 / The Electronics
Component Descriptions
The Vishay TFDS4500
The TFDU4100, TFDS4500, and TFDT4500 are a family of low-power
IR transceiver modules compliant to the IrDA standard for serial
infrared (SIR) data communication, supporting IrDA speeds up to
115.2 kb/s. Integrated within the transceiver modules is a photo PIN
diode, infrared emitter (IRED), and a low-power analog control inte-
grated circuit (IC) to provide a total front-end solution in a single pack-
age. Telefunken’s SIR transceivers are available in three package
options, including our Baby Face package (TFDU4100), once the
smallest SIR transceiver available on the market. This wide selection
provides flexibility for a variety of applications and space constraints.
The transceivers are capable of directly interfacing with a wide vari-
ety of I/O chips, which perform the pulse-width modulation/demodu-
lation function, including Telefunken’s TOIM4232 and TOIM3232. At
a minimum, a current-limiting resistor in series with the IR and a VCC
bypass capacitor are the only external components required to imple-
ment a complete solution, as is the case with PDA Robot.

TFDS4500 Features:
• Compliant to the latest IrDA physical layer standard (up to 115.2
kb/s).
• 2.7 to 5.5 V wide operating voltage range.

• Low power consumption (1.3 mA supply current).
• Power sleep mode through VCC1/SD pin (5 nA sleep current).

• Long range (up to 3.0 m at 115.2 kb/s).
• Three surface-mount package options—universal (9.7 4.7
4.0 mm), side view (13.0 5.95 5.3 mm), top view (13.0 7.6
5.95 mm).

• Directly interfaces with various super I/O and controller devices.
• Built-in electromagnetic interference (EMI) protection—no exter-
nal shielding necessary.
• Few external components required.

• Backward compatible to all Telefunken SIR IR transceivers.

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