Maxim Integrated 78M6631 - Manual (Page 5)

UG_6631_078 78M6631 Firmware Description Document
Rev 2 5
1 Introduction
This document describes the 78M6631 firmware (6631_3PH_6S_URT_B21), which can be used with the
Teridian™ 78M6631 energy measurement IC. This firmware provides measurements for a 3-phase
system along with simple methods for calibration, configuration, and access to metrology data. This
document contains the following sections:
• Functional Description: Signal Processing Flow, Functions, Calibration, and Operations
• Configuration and Control: Configurability and Settings
• Communications: Communication Interfaces and Protocols Description
The calculations are done on each of the phases individually and the aggregate measurements are also
available as follows:
• Voltage rms (Phase A, B, C)
• Current rms (Phase A, B, C)
• Active Power (Phase A, B, C)
• Apparent Power (Phase A, B, C)
• Reactive Power (Phase A, B, C)
• Power Factor (Phase A, B, C)
• Line Frequency
The firmware also provides measurement results on fundamentals and harmonics. Section 2.2.5
describes how to access and configure harmonics measurements.
The firmware supports Delta and Wye Configurations, the configuration is selectable through a dedicated
pin (D/Y) of the 78M6631 or by modifying the configuration register.
A
Neutral
B
C
VC VB VA
LOAD A
LOAD B
LOAD C
IAP IAN IBP IBN ICP ICN V
3P
3A
A
Neutral
B
C
78M6631
D
/Y
Figure 1. Simplified Connection Diagram of a 3-Phase Wye System
Teridian is a trademark of Maxim Integrated Products, Inc.