Specifications

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Wireless Connectivity Guide Texas Instruments 4Q 2014
The TMS3705 is a highly integrat-
ed transceiver IC to support all
HDXtranspondersandTILFdual
interface devices. This base station
IC drives the antenna of a transpon-
der system to send data modulated
on the antenna signal, and to detect
and demodulate the response from
the transponder. It allows efficient
development and enables minimiz-
ing the external component count for
RFID reader systems.
Key features
• TransceiverICfor134.2kHz
Transponder and PaLFI – Passive
Low Frequency Interface Device
• HDXtransmissionprinciple
• DigitalFM/FSKdemodulator
• Asynchronousorsynchronousdata
interface to µC
• Automatictransponderfrequency
measurement and adaptation
• Integrateddiagnosisfunctions
• Fullbridgeantennadriver
• Built-inband-passfilterandlimiter
• Short-circuitprotection
• Power-onreset
• PLLforinternalclockgeneration
• Sleep-modecurrentconsumption:
typ. 15 µA
• Designedforautomotive
requirements
• 16-pinSOIC(D)package
Benefits
• 2-wireinterface
• Lowexternalcomponentcount
• Remoteantennaprinciple
(up to 10m)
134.2-kHz Transceiver IC
TMS3705
Get samples, evaluation modules and application notes at: www.ti.com/sc/device/TMS3705
Part number TMS3705
Operatingfrequency 134.2kHz
Communicationinterface SCIAsyn/Sync
Supplyvoltage 4.5Vto5.5VDC
Currentconsumption
RX8mA
TX220mApeak
SleepMode15µA
Transmittermodulation 100%ASK
Demodulationformat FM/FSK
FSKdatarate 8kbps
Transmissionprinciple HDX
Operatingtemperature –40˚Cto+85˚C
Storagetemperature –55˚Cto+150˚C
Package 16-pinSOIC-D
Packing/delivery Tape-onReel,2500perreel
TMS3705 block diagram.
Applications
• 134.2kHzReader(HDX)for:
Automotive immobilizer
Animal ID
Access control
Industrial automation
Container tracking
Asset management
RFID
TMS3705
Supply
V-Reg
5Volt
µC
TMS3705
LF Base Station IC
134.2kHz
Data
TXCT
R1
R2
ANT2
Loop
Antenna
Air Coil or Ferrite
inductance
200 to 700µH
ANT1
C1
Development tools and software
• Includedinez430-TMS37157
Evaluation Kit
For more information on transponders
and inlays please visit
www.ti.com/lf-transponders