Description

The 78M6612-IM is an energy metering electronic component used for single-phase power and energy monitoring applications. It is a highly integrated SOC (System On Chip) featuring a 32-bit compute engine, MPU core, RTC, and flash. The patented Single Converter Technology® with a 22-bit delta-sigma ADC, 4 analog inputs, and digital temperature compensation, along with precision voltage reference, enables the component to support a wide range of power measurement applications with very few external components.

Specifications and features

• Measures each outlet of a duplex receptacle with a single IC
• Provides complete energy measurement and communication protocol capability in a single IC
• Intelligent switch control capability
• <0.5% Wh accuracy over 2000:1 current range and over temperature
• Exceeds IEC62053 / ANSIC12.20 standards
• Voltage reference < 40 ppm/°C
• Four sensor inputs – VDD referenced
• Low jitter Wh and VARh pulse test outputs (10 kHz maximum)
• Pulse count for pulse outputs
• Line frequency count for RTC
• Digital temperature compensation
• Sag detection for phase A and B
• Independent 32-bit compute engine
• 46-64 Hz line frequency range with same calibration
• Phase compensation (±7°)
• Battery backup for RTC and battery monitor
• Three battery modes with wake-up timer: Brownout mode (48 µA), LCD mode (5.7 µA), Sleep mode (2.9 µA)
• Energy display on main power failure
• Wake-up timer
• 22-bit delta-sigma ADC
• 8-bit MPU (80515), 1 clock cycle per instruction w/ integrated ICE for MPU debug
• RTC with temperature compensation
• Auto-Calibration
• Hardware watchdog timer, power fail monitor
• LCD driver (up to 152 pixels)
• Up to 18 general-purpose I/O pins
• 32 kHz time base
• 32 KB Flash with security
• 2 KB MPU XRAM
• Two UARTs
• Digital I/O pins compatible with 5 V inputs
• 64-pin LQFP or 68-pin QFN package
• RoHS compliant (6/6) lead-free packages
• Complete Application Firmware available

Application Scenarios

78M6612-IM can be used in various applications such as monitoring and measuring energy usage in homes, buildings, and industrial environments. It can also provide energy display on main power failure, which can be critical in situations where power outages can cause significant disruptions.

Comparison

• Highly integrated SOC with very few external components required
• Single Converter Technology® and precision voltage reference facilitate a wide range of power measurement applications
• Supports complete energy measurement and communication protocol capability in a single IC
• Low jitter Wh and VARh pulse test outputs with a maximum of 10 kHz
• Digital temperature compensation and phase compensation features for higher accuracy
• Battery backup for RTC and battery monitor with several battery modes options, ensuring uninterrupted functionality
• Wide operating range with the same calibration
• Digital I/O pins compatible with 5 V inputs

• Limited to single-phase power and energy monitoring applications
• Package options may not be suitable for certain types of designs
• Complete Application Firmware available, which may require additional development effort