AN3322 datasheet(1/38 Pages) STMICROELECTRONICS

Part #	AN3322

Description	Watt-hour meter based on the STM32F101 microcontroller

PDF	38 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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May 2013

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AN3322

Application note

Watt-hour meter based on the STM32F101 microcontroller

By Ludek Holoubek

Introduction

This document describes, in detail, the hardware and software implementation of a watt-

hour meter using the STM32F101 microcontroller. This cost effective watt-hour meter uses

shunt with an operational amplifier as a current sensor, an embedded 12-bit ADC for current

and voltage measurement, GPIO for LCD management, and a lot of other peripherals for

communication, tamper detection, keyboard, and power disconnection. Powerful

architecture of the STM32™ microcontroller allows sampling at 1 Msps. The high sampling

rate makes it possible to use methods for ADC resolution enhancement.

Main features

 Metrological parts

– Microcontroller and external op amp only

– Compliant with EN 50470-1:2006 Class B, precision better than 1%

– Starting current 20 mA, nominal current 5 A, maximum current 100 A

– Reads the voltage and the current signal up to the 21st harmonic

– Shunt as a current sensor. CT and Rogowski coil is optional

 Additional parts included in reference design

– LCD driven directly by microcontroller

– Keyboard driven directly by microcontroller

– An extra external EEPROM for user data

– Bi-stable relay, IR communication, serial communication

– Backup battery, complete power meter power management

www.st.com

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