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TMS37157 Datasheet Preview

TMS37157 Datasheet

PASSIVE LOW FREQUENCY INTERFACE

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TMS37157
www.ti.com
SWRS083A – SEPTEMBER 2009 – REVISED NOVEMBER 2009
PASSIVE LOW FREQUENCY INTERFACE DEVICE WITH EEPROM
AND 134.2 kHz TRANSPONDER INTERFACE
Check for Samples: TMS37157
FEATURES
1
• Wide Supply Voltage Range 2 V to 3.6 V
• Ultra Low Power Consumption
– Active Mode Max. 150 μA
– Power Down Mode 60 nA
• 121 Free Bytes User Memory
• Low Frequency Halb Duplex (HDX) Interface
– HDX Transponder Communication
Achieving Maximum Perfomance and
Highest Noise Immunity
– Special Selective Addressing Mode Allows
Anti Collision
– Up to 8 kbit/s LF Uplink Data Rate
– 126 Byte EEPROM:
– 121 Bytes Free Available EEPROM User
Memory
– 32 Bit Unique Serial Number
– 8 Bit Selective Address
– High EEPROM Flexibility
– Pages are Irreversible Lockable and
Protectable
– Battery Check and Battery Charge Function
– Resonance Frequency: 134.2 kHz
– Integrated Resonance Frequency Trimming
– Downlink – Amplitude Shift Keying
– Uplink – Frequency Shift Keying
• 3 Wire SPI Interface for Accessing the
EEPROM and Exchanging Data With the
Microcontroller Through the LF Interface
• 0.6mm Pitch, 4mm x 4mm VQFN Package
APPLICATIONS
• Wireless Batteryless Sensor Interface using
Energy Harvesting
– Microcontroller and Sensor can be
Powered Through the LF Link
– Data is Directly Transmitted Over the LF
Link From the Base Station via the
TMS37157 to the Micrcontroller and Vice
Versa.
• Batteryless Configuration Memory
– Memory can be Written Without Battery
Support
– Microcontroller can Read the Content of the
Memory When It Gets Connected to a
Battery and Use It for Configuration
– Microcontroller can Write the Memory,
Which can be Read Out Later Through the
LF Link
• Ultra Low Power Data Logger Memory (Smart
Metering)
– Memory Can Be Written By a
Microcontroller
– Memory Can Be Read Through LF Interface
Without Battery Support
• Multi Purpose LF Interface to a Microcontroller
– Short Range RF Interface to a
Microcontroller Where Other Frequencies
are Not an Option
– Ultra Low Power Mode can Result in an
Overall Power Consumption of 60 nA
• Remote Control Application
– Combination With an UHF Transmitter or IR
Transmitter and a μC
– Power Management of the TMS37157 can
Power Down the Microcontroller
– The Push Button Detection Circuit can
Power Up a Microcontroller
• Stand Alone LF-Transponder with Memory
– RFID Transponder with Unique ID and 121
Bytes Free Programmable EEPROM User
Memory
– Only Few Additional Components Needed
– No Battery Required
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated




etcTI

TMS37157 Datasheet Preview

TMS37157 Datasheet

PASSIVE LOW FREQUENCY INTERFACE

No Preview Available !

TMS37157
SWRS083A – SEPTEMBER 2009 – REVISED NOVEMBER 2009
www.ti.com
DESCRIPTION/ORDERING INFORMATION
The TMS37157 combines a Low Frequency Transponder Interface with an SPI Interface and Power
Management for a connected microcontroller. It is the ideal device for any Configuration, Data Logger-, Sensor-
or Remote Control Application. The Transponder memory is accessible through SPI and LF and, in the second
case, operates without the need for a battery. The use of the Low Frequency Band ensures a communication in
a defined direction and harsh environments.
The TMS37157 manages the Transponder communication and push button interaction. During sleep state the
devices enters a special low power mode with only 60 nA current consumption.
The EEPROM memory is accessible over the LF interface without support from the battery or through SPI by a
microcontroller if a battery is connected. The TMS37157 offers a special battery charge mode.
The external resonance circuit with a LF coil and a resonance capacitor can be trimmed to the correct resonance
frequency with the integrated trimming capability achieving an easy way to eliminate part tolerances.
The small RSA 16-pin package together with only a few external components results in a cost efficient design.
Digital or Analog
Sensor
Microcontroller
LF Reader
134,2 kHz
ENERGY
LF DATA
Base Station
TMS37157
Sensor System
2 Submit Documentation Feedback
Product Folder Link(s): TMS37157
Copyright © 2009, Texas Instruments Incorporated


Part Number TMS37157
Description PASSIVE LOW FREQUENCY INTERFACE
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