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TI公司的tms37157把低频收发器接口和SPI接口与功率管理组合在一起,非常适合任何配置,数据收罗,传感器遥控制应用.TMS37157工作电压2V到3.6V,超低的功耗,工作时功耗为150uA,降功耗模式为60nA.本文先容TMS37157主要特点,广泛的应用范围,方框架图,功率管理框架图, 和直接毗连到电池的MCU应用电路,以及MCU毗连到TMS37157 VBATI输出的应用电路. 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. TMS37157主要特点:
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