TMS37157IRSARG4

• 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

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-, Sensoror 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.