Single-Phase Energy Measurement IC with
8052 MCU, RTC and LCD driver
Preliminary Technical Data
ADE75xx/ADE71xx
GENERAL FEATURES
MICROPROCESSOR FEATURES
8052 based core
Wide supply voltage operation 2.4 to 3.7V
Battery supply input with Automatic switch-over
Reference 1.2 V 1% (drift 50 ppm/°C Maximum)
64-Lead Quad Flat (LQFP) or Chip Scale (LCSP) Lead Free
Packages1
Single-cycle 4MIPS 8052 core
8052 compatible instruction set
32.768 kHz external crystal with on-chip PLL
Two external interrupt sources
External reset pin
Operating Temperature -40°C to 85°C
Real Time Clock
Counter for seconds, minutes and hours
Automatic battery switchover for RTC back up
Ultra-Low Battery Supply Current < 1μA
Software clock calibration with temperature and offset
compensation
ENERGY MEASUREMENT FEATURES
High accuracy active, reactive energy measurement IC,
supports IEC 62053-21, 62053-22, 62053-23
Two differential inputs with PGAs to support Shunt, Current
Transformer and di/dt current sensors
Selectable Digital integrator to support di/dt current sensor
Digital parameters for Gain, offset and phase compensation
Selectable No-load threshold level for Watt, VA, and VAR
anti-creep
Less than 0.1% error on active energy over a dynamic range
of 1000 to 1 @ 25C
Less than 0.5% error on reactive energy over a dynamic
range of 1000 to 1 @ 25C
Integrated LCD driver
104-segment with 2, 3 or 4 Multiplexer
3V/5V driving capability
Internally generated LCD drive voltages
Temperature and Supply compensated drive voltages
Low power battery mode
Wake-up from I/O and UART
LCD driver capability
On-chip peripherals
UART, SPI or I2C
Less than 0.5% error on rms measurements over a dynamic
range of 1000 to 1 for current and 100:1 for voltage @ 25C
Auto-calibration of offsets
Watch-Dog timer
High frequency outputs supply proportional to Irms, active,
reactive or apparent power
Proprietary ADCs and DSP provide high accuracy over large
variations in environmental conditions and time
Power Supply Monitoring with User Selectable Levels
Memory: 16kBytes Flash Memory, 512 Bytes RAM
Development tools
Temperature monitoring
Single pin emulation
IDE based assembly and C source debugging
1 Please contact your Analog Devices representative to check availability of
this package
GENERAL DESCRIPTION
The ADE75xx/ADE71xx integrates Analog Devices Energy (ADE) Metering IC analog front end and fixed function DSP solution
with an enhanced 8052 MCU core, a RTC, an LCD driver and all the peripherals to make an electronic energy meter with LCD
display with a single part.
The ADE Energy Measurement core includes Active, Reactive, Apparent Energy calculations, as well as voltage and current rms
measurements. This information is ready to use for energy billing by using built-in energy scalars. Many power line
supervisory features like SAG, Peak, Zero-crossing are also included in the energy measurement DSP to simplify energy meter
design.
The microprocessor functionality includes a single cycle 8052 core, a Real Time Clock with a power supply back-up pin, a
UART, and a SPI or I2C interface. The ready to use information from the ADE core reduces the program memory size
requirement thus making it easy to integrate complicated design in 16k Bytes of Flash memory.
The ADE75xx/ADE71xx also includes a 108/104-segment LCD driver respectively. This driver generates voltages capable of
driving 5V LCDs.
Rev. PrE 01/07
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Specifications subject to change without notice. No license is granted by implication
Tel: 781.329.4700
Fax: 781.326.8703
www.analog.com
© 2007 Analog Devices, Inc. All rights reserved.
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
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