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.

• 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

• Frequency
• 134.2 kHz
• Standard
• TI protocol
• Operating temperature range (C)
• -40 to 85
• Rating
• Automotive
• Transmission principle
• HDX - FSK

TMS37157的完整型号有：TMS37157IRSARG4，以下是这些产品的关键参数及官网采购报价：

TMS37157IRSARG4，工作温度：-40 to 85，封装：QFN (RSA)-16，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TMS37157IRSARG4的批量USD价格：1.039（1000+）

TMS37157IRSARG4，工作温度：-40 to 85，封装：QFN (RSA)-16，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网TMS37157IRSARG4的批量USD价格：1.039（1000+）