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AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

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19-6039; Rev 2; 4/12

78M6631

3-Phase Power-

Measurement IC

DATA SHEET

DS_6631_056

DESCRIPTION

The Teridian™ 78M6631 is a highly integrated 3-phase

power measurement and monitoring system-on-chip

(SoC), with a 10 MHz 8051-compatible MPU core and

Single Converter Technology® containing a 22-bit delta-

sigma converter and 32-bit compute engine (CE). The

78M6631 has been designed specifically for a wide

variety of applications requiring 3-phase power and

quality measurements. It supports both Delta and Wye

configurations.

At the measurement interface, the device provides six

analog inputs including three differential current and three

voltage for interfacing to current and voltage sensors. The

device provides better than 0.5% accuracy over a wide

2000:1 dynamic range.

The integrated MPU core and 128 KB of flash memory

provide a flexible means of configuration, post-

processing, data formatting, interfacing to host processor

via a UART or SPI interface, or using DIO pins for LEDs

or relay control. Complete firmware is available from

Maxim and can be loaded into the IC during

manufacturing test.

FEATURES

 < 0.5% Watt Accuracy Over 2000:1 Current

Range and Over Temperature

 Exceeds IEC 62053/ANSI C12.20 Standards

 Voltage Reference < 40 ppm/°C

 Six Analog Inputs Supporting 3-Phase Voltage

and Current Measurement Inputs

 Pin- or Biselectable Delta or Wye Configuration

 22-Bit Delta-Sigma ADC with Independent 32-

Bit Compute Engine (CE)

 8-Bit MPU (80515), One Clock Cycle per

Instruction with 4 KB MPU XRAM

 128 KB Flash with Security

 32 kHz Time Base with Hardware Watchdog

Timer

 UART, I

C, and High-Speed Slave SPI Host

Interface Options

 17 General-Purpose 5 V Tolerant I/O Pins

 Packaged in a RoHS-Compliant (6/6)

Lead(Pb)-Free 56-Pin TQFN

 Application Firmware Includes (per Phase):

o True RMS Current and Voltage Calculations

o Active, Reactive, Apparent, Fundamental,

and Harmonic Power Calculations

o Fundamental and Harmonic Current and

Voltage Calculations

o Line Frequency and Power Factor

Calculations

o Phase Compensation (18 at 60 Hz)

o Built-In Calibration Routines

o Programmable Alarm Thresholds

o Command Line (UART) Communications

o High-Speed SPI Communications

Teridian is a trademark and Single Converter Technology is a registered trademark of Maxim Integrated Products, Inc.

Summary of content (30 pages)

PAGE 1
9-6039; Rev 2; 4/12 78M6631 3-Phase PowerMeasurement IC LE AVAILAB DATA SHEET DS_6631_056 DESCRIPTION FEATURES The Teridian™ 78M6631 is a highly integrated 3-phase power measurement and monitoring system-on-chip (SoC), with a 10 MHz 8051-compatible MPU core and Single Converter Technology® containing a 22-bit deltasigma converter and 32-bit compute engine (CE). The 78M6631 has been designed specifically for a wide variety of applications requiring 3-phase power and quality measurements.
PAGE 2
78M6631 Data Sheet DS_6631_056 Table of Contents 1 Hardware Functional Description...................................................................................................... 5 1.1 Hardware Overview ..................................................................................................................... 5 1.2 Device Reset................................................................................................................................ 7 1.3 Power Management.............
PAGE 3
DS_6631_056 4.1 4.2 4.3 78M6631 Data Sheet Power and Ground Pins............................................................................................................. 26 Analog Pins................................................................................................................................ 26 Digital Pins ................................................................................................................................. 27 5 I/O Equivalent Circuits.................
PAGE 4
78M6631 Data Sheet DS_6631_056 Figures Figure 1: 78M6631 IC Functional Block Diagram ......................................................................................... 6 Figure 2: AFE Block Diagram ....................................................................................................................... 8 Figure 3: Functions Defined by V1..............................................................................................................
PAGE 5
DS_6631_056 78M6631 Data Sheet 1 Hardware Functional Description 1.1 Hardware Overview The Teridian 78M6631 single-chip power measurement and monitoring device integrates all the primary AC measurement and control blocks required to implement the 3-phase power measurement and monitoring system.
PAGE 6
78M6631 Data Sheet DS_6631_056 VREF V3P3A GNDA V3P3SYS IAP ADC CONVERTER IAN VBIAS IBP IBN V3P3D VBIAS FIR RTM VBAT VADC ICP ICN to TMUX VREF VREF VOLT REG RPULSE CE MUXP WPULSE VA GNDD XPULSE VB CE_ PROG 16 32 CE_ DATA YPULSE XPULSE WPULSE RPULSE YPULSE VC V3P3D TEMP MCK PLL XIN XOUT 80MHz CK_CE FLASH 128KB 2.5V to Logic MULTIPURPOSE IO XRAM 4kB DIO3 DIO4/SDCK DIO5/SDATA DIO6 DIO8 DIO9 D/Y DIO11 CK_ MPU OSC (32.
PAGE 7
DS_6631_056 1.2 78M6631 Data Sheet Device Reset When the RESET pin is pulled high, all digital activity stops. Only the oscillator and RTC module continue to run. Additionally, all IORAM bits are set to their default states. As long as V1 (the input voltage at the power fault block) is greater than VBIAS, the internal 2.5 V regulator continues to provide power to the digital section. Once initiated, the reset mode persists until the reset timer times out.
PAGE 8
78M6631 Data Sheet 1.4 DS_6631_056 Analog Front-End (AFE) The AFE functions as a data acquisition system, controlled by the MPU. The main blocks in the AFE consist of an input multiplexer, a delta-sigma A/D converter, a FIR decimation filter and a voltage reference. The metrology input signals (IAP, IAN, IBP, IBN, ICP, ICN, VA, VB, VC, and TEMP) are multiplexed before being sampled by the ADC.
PAGE 9
DS_6631_056 1.5 78M6631 Data Sheet Digital Computation Engine (CE) The CE, a dedicated 32-bit digital signal processor, performs the back-end computations.
PAGE 10
78M6631 Data Sheet 1.6 DS_6631_056 80515 MPU Core The 78M6631 includes an 80515 MPU (8-bit, 8051-compatible) that processes most instructions in one clock cycle. The 80515 architecture eliminates redundant bus states and implements parallel execution of fetch and execution phases. Normally, a machine cycle is aligned with a memory fetch, therefore, most of the 1-byte instructions are performed in a single machine cycle (MPU clock cycle).
PAGE 11
DS_6631_056 78M6631 Data Sheet 1.10 Oscillator The 78M6631 oscillator drives a standard 32.768 kHz quartz crystal. These crystals are accurate and do not require a high-current oscillator circuit. The 78M6631 oscillator has been designed specifically to handle these crystals and is compatible with their high impedance and limited power handling capability. The oscillator is powered directly and only from V3P3D, which therefore must be connected to a DC voltage source not to exceed 4 V.
PAGE 12
78M6631 Data Sheet DS_6631_056 1.14 Temperature Sensor The device includes an on-chip temperature sensor for determining the temperature of the bandgap reference. The primary use of the temperature data is to determine the magnitude of compensation required to offset the thermal drift in the system. 1.15 General-Purpose Digital I/O The 78M6631 includes 17 general-purpose digital I/O pins. As inputs, these pins are 5V compatible (no current-limiting resistors are needed).
PAGE 13
DS_6631_056 78M6631 Data Sheet Table 1: SPI Command Description Command 11xx xxxx ADDR D0 ... DN 1100 0000 ADDR D0 ... DN 10xx xxxx ADDR D0 ... DN 1000 0000 ADDR D0 ... DN CMD ADDR D0 ... DN SERIAL READ Description Output data on PSDO is read from RAM starting with byte at ADDR. ADDR auto increments until PCSZ is raised. MPU SPI interrupt is generated. Output data on PSDO is read from RAM starting with byte at ADDR. ADDR auto increments until PCSZ is raised. No MPU SPI interrupt is generated.
PAGE 14
78M6631 Data Sheet DS_6631_056 1.21 In-Circuit Emulator (ICE) Port The 78M6631 implements an In-Circuit Emulator (ICE) port for debug and programming of the device. To enable the use of the port the ICE_E pin must be pulled high. In this mode the E_RST, E_TCLK, and E_RXTX pins are enabled. Contact Maxim support for more information regarding the use of the ICE interface for device programming and debug.
PAGE 15
DS_6631_056 78M6631 Data Sheet 2 Electrical Specifications 2.1 Absolute Maximum Ratings Table 2 shows the absolute maximum ranges for the device. Stresses beyond Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation at these or any other conditions beyond those indicated under recommended operating conditions (Section 2.3) is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
PAGE 16
78M6631 Data Sheet 2.2 DS_6631_056 Recommended External Components Table 3: Recommended External Components Name From To C1 V3P3A AGND C3 V3P3D XTAL Function Value Unit Bypass capacitor for 3.3 V supply  0.1 20% F DGND Bypass capacitor for V3P3D  1.0 30% F XIN XOUT 32.768 kHz crystal, electrically similar to ECS .327-12.5-17X or Vishay XT26T, load capacitance 12.5 pF 32.
PAGE 17
DS_6631_056 2.4 78M6631 Data Sheet Performance Specifications 2.4.1 Input Logic Levels Table 5: Input Logic Levels Parameter Condition Min 1 Digital high-level input voltage , VIH Typ Max 2 V 1 Digital low-level input voltage , VIL Input pullup current, IIL E_RXTX, E_RST, CKTEST Other digital inputs VIN = 0 V, ICE_E = 1 Input pulldown current, IIH ICE_E RESET Other digital inputs VIN = V3P3D Unit 10 10 -1 10 10 -1 0.
PAGE 18
78M6631 Data Sheet DS_6631_056 2.4.4 Power Supply Monitor Table 8: Power Supply Monitor Performance Specifications (BME= 1) Parameter Load Resistor LSB Value Condition Min Typ Max Unit – 27 45 63 kΩ [M40MHZ, M26MHZ] = [00], [10], or [11] FIR_LEN=0(L=138) FIR_LEN=1(L=288) (-10%) -48.7 -5.35 (+10%) V V [M40MHZ, M26MHZ] = [01] FIR_LEN=0(L=186) FIR_LEN=1(L=384) (-10%) -19.8 -2.26 (+10%) -200 0 +100 V V mV Typ Max Unit Normal Operation, V3P3A = V3P3SYS = 3.
PAGE 19
DS_6631_056 78M6631 Data Sheet 2.4.7 Temperature Sensor Table 11 shows the performance for the temperature sensor. The LSB values do not include the 8-bit left shift at CE input. Table 11: Temperature Sensor Performance Specifications Parameter Condition Min Typ Max Unit Nominal relationship: N(T) = Sn*(T-Tn) + Nn, Tn = 22ºC [M26MHZ, M40MH] = [00], [01], or [11] Nominal Sensitivity (Sn) L S n  0.00107    3 3 Nominal Offset (Nn) 4 L N n  0.
PAGE 20
78M6631 Data Sheet DS_6631_056 2.4.9 ADC Converter, V3P3A Referenced Table 13 shows the performance specifications for the ADC converter, V3P3A referenced. For this data, FIR_LEN = 0, VREF_DIS = 0 and LSB values do not include the 9-bit left shift at the CE input. Table 13: ADC Converter Performance Specifications Parameter Condition Recommended Input Range (VIN - V3P3A) Voltage to Current Crosstalk 6 10 *Vcrosstalk cos(Vin  Vcrosstalk) Vin VIN = 200 mV peak, 65 Hz, on VA.
PAGE 21
DS_6631_056 2.5 78M6631 Data Sheet Timing Specifications 2.5.1 Flash Memory Table 14: Flash Memory Timing Specifications Parameter Condition Flash write cycles -40°C to +85°C Flash data retention Flash data retention Min Typ Max Unit 20,000 Cycles +25°C 100 Years +85°C 10 Years Flash byte write operations between page or mass erase operations 2 Cycles Write Time per Byte 42 s Page Erase (1024 bytes) 20 ms Mass Erase 200 ms Max Unit 2.5.
PAGE 22
78M6631 Data Sheet DS_6631_056 2.5.
PAGE 23
DS_6631_056 78M6631 Data Sheet 3 Packaging 3.1 56-Pin QFN Package 3.
PAGE 24
78M6631 Data Sheet DS_6631_056 3.2.
PAGE 25
DS_6631_056 78M6631 Data Sheet 3.2.
PAGE 26
78M6631 Data Sheet DS_6631_056 4 Pin Descriptions 4.1 Power and Ground Pins Table 18: Power and Ground Pins Name Type Circuit GNDA P – Analog ground: This pin should be connected directly to the ground plane. GNDD P – Digital ground: This pin should be connected directly to the ground plane. V3P3A P – Analog power supply: A 3.3 V power supply should be connected to this pin, must be the same voltage as V3P3SYS. V3P3D P – System 3.3 V supply. This pin should be connected to a 3.
PAGE 27
DS_6631_056 4.3 78M6631 Data Sheet Digital Pins Table 20: Digital Pins Name DIO3 DIO4,DIO5,DIO6 DIO8, DIO9, DIO11 DIO17 DIO24, DIO25 DIO29, DIO30 DIO45, DIO47 DIO51, DIO53 DIO55 D/Y Type Circuit I/O 3, 4 I/O I Description Dedicated DIO pin. 3, 4, 5 Multi-use pins, DIO. (DIO4 = SCK, DIO5 = SDA when configured as EEPROM interface; If unused, these pins must be configured as DIOs and set to outputs by the firmware. – Selects either the Delta or the Wye configuration.
PAGE 28
78M6631 Data Sheet DS_6631_056 5 I/O Equivalent Circuits V3P3D V3P3A V3P3D 110K Digital Input Pin CMOS Input from internal reference LCD SEG Output Pin LCD Driver VREF Pin GNDD GNDD GNDA LCD Output Equivalent Circuit Type 5: LCD SEG or pin configured as LCD SEG Digital Input Equivalent Circuit Type 1: Standard Digital Input or pin configured as DIO Input with Internal Pull-Up VREF Equivalent Circuit Type 9: VREF V3P3A V3P3D V3P3D Digital Input Pin CMOS Input Analog Input Pin GNDD GNDD
PAGE 29
DS_6631_056 78M6631 Data Sheet 6 Ordering Information Table 21: Ordering Information Part Part Description (Package) Flash Size 78M6631 56-pin QFN, Lead(Pb)Free 128 KB 7 Packaging Order Number Bulk 78M6631-IM/F Tape and Reel 78M6631-IMR/F Package Marking 78M6631 Contact Information For more information about Maxim products or to check the availability of the 78M6631, contact technical support at www.maxim-ic.com/support.
PAGE 30
DS_6631_056 78M6631 Data Sheet Revision History REVISION NUMBER REVISION DATE 0 9/11 Initial release  1 1/12 Removed information about programmed devices from Table 21. Ordering Information 29 2 4/12 Removed “-IM” from the Package Marking 29 DESCRIPTION PAGES CHANGED Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.