Single-Phase Energy Measurement IC with
8052 MCU, RTC, and LCD Driver
ADE7518
GENERAL FEATURES
MICROPROCESSOR FEATURES
Wide supply voltage operation: 2.4 V to 3.7 V
8052-based core
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
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
Real-time clock (RTC) mode: 1.5 μA
Low power battery mode
RTC and LCD mode: 27 μA
Reference: 1.2 V 0.1% (10 ppm/°C drift)
64-lead RoHS package option
Wake-up from I/O, alarm, and universal asynchronous
receiver/transmitter (UART)
LCD driver operation
Low profile quad flat package (LQFP)
Operating temperature range: −40°C to +85°C
Real-time clock
Counter for seconds, minutes, and hours
Automatic battery switchover for RTC backup
Operation down to 2.4 V
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
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
Less than 0.5% error on reactive energy over a dynamic
range of 1000 to 1 @ 25°C
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
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)
Single-pin emulation
IDE-based assembly and C-source debugging
Rev. 0
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