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,数据采集,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.本文介绍tms37157主要特性,广泛的应用范围,方框图,功率管理框图, 和直接连接到电池的mcu应用电路,以及mcu连接到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主要特性:
tms37157应用:
图1.tms37157方框图
图2.tms37157 功率管理
图3.tms37157和直接连接到电池的mcu应用电路
图3.mcu连接到tms37157 vbati输出的应用电路
