71M6545 Processors Datasheet

71M6545 Datasheet, PDF, Equivalent


Part Number

71M6545

Description

Metrology Processors

Manufacture

Maxim

Total Page 30 Pages
Datasheet
Download 71M6545 Datasheet


71M6545
71M6545/71M6545H
Metrology Processors
GENERAL DESCRIPTION
The 71M6545/71M6545H metrology processors are based on
4th-generation metering architecture supporting the 71M6xxx
series of isolated current sensing products that offer drastic
reduction in component count, immunity to magnetic tampering,
and unparalleled reliability. The 71M6545/71M6545H integrate
our Single Converter Technology® with a 22-bit delta-sigma
ADC, a customizable 32-bit computation engine (CE) for core
metrology functions, as well as a user-programmable 8051-
compatible application processor (MPU) core with up to 64KB
flash and up to 5KB RAM.
An external host processor can access metrology functions di-
rectly through the SPI™ interface, or alternatively through the
embedded MPU core in applications requiring metrology data
capture, storage, and preprocessing within the metrology
subsystem. In addition, the devices integrate an RTC, DIO, and
UART. A complete array of ICE and development tools,
programming libraries, and reference designs enable rapid
development and certification of meters that meet all ANSI and
IEC electricity metering standards worldwide.
C Shunt Resistor Sensors
NEUTRAL
B
A
LOAD
HOST
POWER SUPPLY
This system is referenced to Neutral
NEUTRAL
Pulse Transformers
C
B
A
SPI_CKI
SPI_DI
SPI_DO
SPI_CSZ
XFER_BUSY
SAG
MUX and ADC
IADC0
IADC1
} IN*
VADC10 (VC)
IADC6
IADC7
}
IC
VADC9 (VB)
IADC4
IADC5
}
IB
VADC8(VA)
IADC2
IADC3
} IA
V3P3A V3P3SYS GNDA GNDD
PWR MODE
CONTROL
71M6545/H
PB
REGULATOR
TEMPERATURE
SENSOR
VBAT_RTC
BATTERY
MONITOR
VREF
SERIAL PORT
RX
TX
FLASH
MEMORY
RAM
MPU
RTC
TIMERS
OSCILLATOR/
PLL XIN
XOUT
DIO, PULSES,
LEDs
DIO
ICE
T
SPI INTERFACE
M
U
COMPUTE
ENGINE
X
V3P3D
WPULSE
XPULSE
RPULSE
YPULSE
10/7/2010
RTC
BATTERY
32 kHz
24
DIO
I2C or µWire
EEPROM
PULSES 3.3 VDC
*IN = Optional Neutral Current
FEATURES
0.1% Typical Accuracy Over 2000:1
Current Range
Exceeds IEC 62053/ANSI C12.20 Standards
Seven Sensor Inputs with Neutral Current
Measurement, Differential Mode Selectable
for Current Inputs
Selectable Gain of 1 or 8 for One Current
Input to Support Shunts
High-Speed Wh/VARh Pulse Outputs with
Programmable Width
Flash/RAM Size
32KB/3KB (71M6545)
64KB/5KB (71M6545H)
Up to Four Pulse Outputs with Pulse Count
Four-Quadrant Metering, Phase
Sequencing
Digital Temperature Compensation
Metrology Compensation
Accurate RTC for TOU Functions with
Automatic Temperature Compensation
for Crystal in All Power Modes
Independent 32-Bit Compute Engine
46–64Hz Line Frequency Range with the
Same Calibration
Phase Compensation (±7°)
1µA Supply Current in Sleep Mode
Flash Security
In-System Program Update
8-Bit MPU (80515), Up to 5 MIPS, for
Optional Implementation of Postprocessing
and Host Support Functions (Optional Use)
Up to 29 DIO Pins
Hardware Watchdog Timer (WDT)
I2C/MICROWIRE® EEPROM Interface
SPI Interface for Host:
Full Access to Shared Memory Space
Flash Program Capability
UART
Industrial Temperature Range
64-Pin Lead(Pb)-Free LQFP Package
Single Converter Technology is a registered trademark of Maxim Integrated Products, Inc.
MICROWIRE is a registered trademark of National Semiconductor Corp.
For pricing, delivery, and ordering information, please contact Maxim Direct at
19-5378; Rev 2; 10/13
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

71M6545
71M6545/71M6545H Data Sheet
Table of Contents
1 Introduction ....................................................................................................................................... 10
2 Hardware Description....................................................................................................................... 11
2.1 Hardware Overview ................................................................................................................... 11
2.2 Analog Front End (AFE)............................................................................................................. 12
2.2.1 Signal Input Pins ............................................................................................................ 13
2.2.2
2.2.3
2.2.4
2.2.5
Input Multiplexer............................................................................................................. 14
Delay Compensation ..................................................................................................... 19
ADC Pre-Amplifier ......................................................................................................... 20
A/D Converter (ADC) ..................................................................................................... 20
2.2.6 FIR Filter ........................................................................................................................ 20
2.2.7 Voltage References ....................................................................................................... 20
2.2.8 71M6xx3 Isolated Sensor Interface ............................................................................... 21
2.3 Digital Computation Engine (CE) ............................................................................................... 25
2.3.1 CE Program Memory ..................................................................................................... 25
2.3.2 CE Data Memory ........................................................................................................... 25
2.3.3
2.3.4
2.3.5
2.3.6
CE Communication with the MPU ................................................................................. 25
Meter Equations............................................................................................................. 26
Real-Time Monitor (RTM) .............................................................................................. 26
Pulse Generators ........................................................................................................... 26
2.3.7 CE Functional Overview ................................................................................................ 28
2.4 80515 MPU Core ....................................................................................................................... 30
2.4.1 MPU Setup Code ........................................................................................................... 30
2.4.2 80515 MPU Overview.................................................................................................... 30
2.4.3 Memory Organization and Addressing .......................................................................... 31
2.4.4
2.4.5
2.4.6
2.4.7
2.4.8
2.4.9
Special Function Registers (SFRs)................................................................................ 33
Generic 80515 Special Function Registers ................................................................... 34
Instruction Set ................................................................................................................ 36
UARTs ........................................................................................................................... 36
Timers and Counters ..................................................................................................... 38
WD Timer (Software Watchdog Timer) ......................................................................... 40
2.4.10 Interrupts........................................................................................................................ 40
2.5 On-Chip Resources ................................................................................................................... 46
2.5.1 Physical Memory............................................................................................................ 46
2.5.2 Oscillator ........................................................................................................................ 48
2.5.3
2.5.4
2.5.5
2.5.6
PLL and Internal Clocks................................................................................................. 48
Real-Time Clock (RTC) ................................................................................................. 49
71M6545/H Temperature Sensor .................................................................................. 53
71M6xx3 Temperature Sensor ...................................................................................... 54
2.5.7 71M6545/H Battery Monitor........................................................................................... 55
2.5.8 71M6xx3 VCC Monitor................................................................................................... 55
2.5.9 UART Interface .............................................................................................................. 55
2.5.10 DIO Pins......................................................................................................................... 55
2.5.11 EEPROM Interface ........................................................................................................ 57
2.5.12 SPI Slave Port................................................................................................................ 60
2.5.13 Hardware Watchdog Timer............................................................................................ 64
2.5.14 Test Ports (TMUXOUT and TMUX2OUT Pins) ............................................................. 64
2 v2


Features 71M6545/71M6545H Metrology Processors G ENERAL DESCRIPTION The 71M6545/71M6545H metrology processors are based on 4th- generation metering architecture suppor ting the 71M6xxx series of isolated cur rent sensing products that offer drasti c reduction in component count, immunit y to magnetic tampering, and unparallel ed reliability. The 71M6545/71M6545H in tegrate our Single Converter Technology ® with a 22-bit delta-sigma ADC, a cus tomizable 32-bit computation engine (CE ) for core metrology functions, as well as a user-programmable 8051compatible application processor (MPU) core with u p to 64KB flash and up to 5KB RAM. An e xternal host processor can access metro logy functions directly through the SPI ™ interface, or alternatively through the embedded MPU core in applications requiring metrology data capture, stora ge, and preprocessing within the metrol ogy subsystem. In addition, the devices integrate an RTC, DIO, and UART. A com plete array of ICE and development tools, programming libraries, a.
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