Analog Devices, Inc. - ADE7518

Overview

The ADE7518 integrates the Analog Devices, Inc., energy (ADE) metering IC analog front end and fixed function DSP solution with an enhanced 8052 MCU core, an RTC, an LCD driver, and all the peripherals to make an electronic energy meter with an LCD display in a single part.

The ADE measurement core includes active, reactive, and 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, such as SAG, peak, and zero crossing, are included in the energy measurement DSP to simplify energy meter design. Datasheet

The microprocessor functionality includes a single-cycle 8052 core, a real-time clock with a power supply backup pin, a UART, and an SPI or I2C® interface. The ready-to-use information from the ADE core reduces the program memory size requirement, making it easy to integrate complicated design into 16 kB of flash memory.

Features

General Features

Wide supply voltage operation: 2.4V to 3.7V
Internal bipolar switch between regulated and battery inputs
Ultralow power operation with power saving modes
Full operation: 4 mA to 1.6 mA (PLL clock dependent)
Battery mode: 3.2 mA to 400 µA (PLL clock dependent)
Sleep mode
Real-time clock (RTC) mode: 1.5 µA
RTC and LCD mode: 27 µA
Reference: 1.2V ±0.1% (10 ppm/°C drift)
64-lead RoHS package option
Low profile quad flat package (LQFP)
Operating temperature range: –40°C to +85°C

Energy Measurement Features

Proprietary analog-to-digital converters (ADCs) and digital signal processing (DSP) provide high accuracy active (WATT), reactive (VAR), and apparent energy (VA) measurement
Less than 0.1% error on active energy over a dynamic range of 1000 to 1 @ 25°C
Less than 0.5% error on reactive energy over a dynamic range of 1000 to 1 @ 25°C
Less than 0.5% error on root mean square (rms) measurements over a dynamic range of 500 to 1 for current (Irms) and 100 to 1 for voltage (Vrms) @ 25°C
Supports IEC 62053-21, IEC 62053-22, IEC 62053-23, EN 50470-3 Class A, Class B, and Class C, and ANSI C12-16
Differential input with programmable gain amplifiers (PGAs) supports shunts and current transformers
High frequency outputs proportional to Irms, active, reactive, or apparent power (AP)

Microprocessor Features

8052-based core
Single-cycle 4 MIPS 8052 core
8052-compatible instruction set
32.768 kHz external crystal with on-chip PLL
Two external interrupt sources
External reset pin
Low power battery mode
Wake-up from I/O, alarm, and universal asynchronous receiver/transmitter (UART)
LCD driver operation
Real-time clock
Counter for seconds, minutes, and hours
Automatic battery switchover for RTC backup
Operation down to 2.4V
Ultralow battery supply current: 1.5 µA
Selectable output frequency: 1 Hz to 16.384 kHz
Embedded digital crystal frequency compensation for calibration and temperature variation: 2 ppm resolution
Integrated LCD driver
108-segment driver
2×, 3×, or 4× multiplexing
LCD voltages generated with external resistors
On-chip peripherals
UART, SPI or I2C, and watchdog timer
Power supply management with user-selectable levels
Memory: 16 kB flash memory, 512 bytes RAM
Development tools
Single-pin emulation
IDE-based assembly and C-source debugging

Datasheet

Symbols and Footprints

Diagrams

Pin Configuration

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Functional Block Diagram

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Specifications

Absolete Maximum Ratings

V_DD to DGND	–0.3V to +3.7V
V_BAT to DGND	–0.3V to +3.7V
V_DCIN to DGND	–0.3V to V_SWOUT + 0.3V
Input LCD Voltage to AGND, LCDVA, LCDVB, LCDVC¹	–0.3V to V_SWOUT + 0.3V
Analog Input Voltage to AGND, V_P, V_N, I_P, and I_N	–2V to +2V
Digital Input Voltage to DGND	–0.3V to V_SWOUT + 0.3V
Digital Output Voltage to DGND	–0.3V to V_SWOUT + 0.3V
Operating Temperature Range (Industrial)	–40°C to +85°C
Storage Temperature Range	–65°C to +150°C
64-Lead LQFP, Power Dissipation	1 W
Lead Temperature - Soldering	300°C
Lead Temperature - Time	30 sec
Datasheet

Note 1: When used with external resistor divider.

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ADI P/N	Digi-Key P/N	Description	Datasheet
ADE7518ASTZF8	ADE7518ASTZF8-ND	Energy Meter IC MCU - 64-LQFP 10x10mm 8K
ADE7518ASTZF16	ADE7518ASTZF16-ND	Energy Meter IC MCU - 64-LQFP 10x10mm 16K