特性 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 RequiredDESCRIPTION/ORDERING INFORMATIONThe 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.