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
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.