TMS37157 datasheet(2/47 Pages) TI

2 / 47 page

LF Reader

134,2 kHz

TMS37157

Microcontroller

LF DATA

ENERGY

Base Station

Sensor System

Digital or Analog

Sensor

TMS37157

SWRS083A – SEPTEMBER 2009 – REVISED NOVEMBER 2009

www.ti.com

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-, Sensor-

or 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.

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TMS37157 Datasheet(PDF) 2 Page - Texas Instruments