● 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
●## 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-, 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.
