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Texax Instruments introduced the TMS37157 which combines a Low Frequency Transponder Interface with an SPI Interface and Power Management for a connected microcontroller.
The TMS37157 is the ideal device in applications like : Wireless Batteryless Sensor Interface using Energy Harvesting , Batteryless Configuration Memory , Ultra Low Power Data Logger Memory (Smart Metering) , Multi Purpose LF Interface to a Microcontroller , Remote Control Application , Stand Alone LF-Transponder with Memory and many other .
The TMS37157 transponder memory is accessible through SPI and LF and can operates without the need for a battery.
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 is designed in a small RSA 16-pin package requiring only a few external components and many build-in features like 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 , Up to 8 kbit/s LF Uplink Data Rate , 126 Byte EEPROM , 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 .
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