本文介绍了EM773主要特性和优势，方框图，智能电表原理方框图，电表主要元件BOM以及智能电表无线插头电表电路图和电表指标。 NXP 公司的EM773是基于ARM Cortex-M0的低功耗32位智能电表集成电路，CPU频率高达48MHz，具有丰富外设包括多达32KB标闪存，多达8KB数据存储器，一个Fast-mode PlusI2C总线接口，一个RS-485/EIA-485 UART，一个带SSP特性的SPI接口，三个通用计数器/定时器，多达25个GPIO，以及用于电能测量的测量引擎。 EM773主要特性和优势：
System:
ARM Cortex-M0 processor, running at frequencies of up to 48 MHz.
ARM Cortex-M0 built-in Nested Vectored Interrupt Controller (NVIC).
Serial Wire Debug.
System tick timer.
Memory:
32 kB on-chip flash programming memory.
8 kB SRAM.
In-System Programming (ISP) and In-Application Programming (IAP) via on-chip bootloader software.
Digital peripherals:
Up to 25 General Purpose I/O (GPIO) pins with configurable pull-up/pull-down resistors.
GPIO pins can be used as edge and level sensitive interrupt sources.
High-current output driver (20 mA) on one pin.
High-current sink drivers (20 mA) on two I2C-bus pins in Fast-mode Plus.
Three general purpose counter/timers with a total of two capture inputs and 10 match outputs.
Programmable WatchDog Timer (WDT).
Analog peripherals:
Metrology Engine for Smart Metering with two current inputs and a voltage input.
Serial interfaces:
UART with fractional baud rate generation, internal FIFO, and RS-485 support.
One SPI controller with SSP features and with FIFO and multi-protocol capabilities.
I2C-bus interface supporting full I2C-bus specification and Fast-mode Plus with a data rate of 1 Mbit/s with multiple address recognition and monitor mode.
Clock generation:
12 MHz internal RC oscillator trimmed to 1 % accuracy that can optionally be used as a system clock.
[开关电源]CT取电-高压输电线路监本帖最后由power265于2017-5-509:12编辑
【感应取电资料集锦】CT取电电源技术-从电力系统高压母线获取低压电源
目录
1电流感应电源（CT取电）概述
1.1电流感应电源定义
1.2电流 [转载]采用磁致伸缩技术的位移传感 无接触的位移传感器，是对基于电位技术的位移传感器的革命性改进，相比于过去复杂的应用，采用磁致伸缩技术的位移传感器，无论在界面还是性能上，都有很大提升。您知道磁致伸缩技术 一体成型电感特点及相关技技术资料 一体成型电感与传统电感到底有何区别
一体成型电感属软磁粉末里的新式电感器，由于它有着自成闭合磁路机构与软磁材料选用的多样性。
一体成型电感的主要特 贴片元器件封装之SMT基础知识讲解贴片元件封装--SMT基础知识介绍简介：SMT(Surface Mount Technology)是电子业界一门新兴的工业技术，它的兴起及迅猛发展是电子组装业的一次革命，被誉为电子业的”明日之星&
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