71M6542FSLASHG datasheet(2/166 Pages) MAXIM

2 / 166 page

71M6541D/F/G and 71M6542F/G Data Sheet

Rev 5

Table of Contents

Introduction ....................................................................................................................................... 10

Hardware Description....................................................................................................................... 11

2.1

Hardware Overview ................................................................................................................... 11

2.2

Analog Front End (AFE)............................................................................................................. 12

2.2.1

Signal Input Pins ............................................................................................................ 14

2.2.2

Input Multiplexer............................................................................................................. 15

2.2.3

Delay Compensation ..................................................................................................... 19

2.2.4

ADC Pre-Amplifier ......................................................................................................... 20

2.2.5

A/D Converter (ADC) ..................................................................................................... 20

2.2.6

FIR Filter ........................................................................................................................ 20

2.2.7

Voltage References ....................................................................................................... 20

2.2.8

71M6x01 Isolated Sensor Interface (Remote Sensor Interface) ................................... 22

2.3

Digital Computation Engine (CE) ............................................................................................... 24

2.3.1

CE Program Memory ..................................................................................................... 24

2.3.2

CE Data Memory ........................................................................................................... 24

2.3.3

CE Communication with the MPU ................................................................................. 25

2.3.4

Meter Equations............................................................................................................. 25

2.3.5

Real-Time Monitor (RTM) .............................................................................................. 25

2.3.6

Pulse Generators ........................................................................................................... 27

2.3.7

CE Functional Overview ................................................................................................ 28

2.4

80515 MPU Core ....................................................................................................................... 31

2.4.1

Memory Organization and Addressing .......................................................................... 31

2.4.2

Special Function Registers (SFRs)................................................................................ 33

2.4.3

Generic 80515 Special Function Registers ................................................................... 34

2.4.4

Instruction Set ................................................................................................................ 37

2.4.5

UARTs ........................................................................................................................... 37

2.4.6

Timers and Counters ..................................................................................................... 39

2.4.7

WD Timer (Software Watchdog Timer) ......................................................................... 41

2.4.8

Interrupts........................................................................................................................ 41

2.5

On-Chip Resources ................................................................................................................... 48

2.5.1

Physical Memory............................................................................................................ 48

2.5.2

Oscillator ........................................................................................................................ 50

2.5.3

PLL and Internal Clocks................................................................................................. 50

2.5.4

Real-Time Clock (RTC) ................................................................................................. 51

2.5.5

71M654x Temperature Sensor ...................................................................................... 56

2.5.6

71M654x Battery Monitor............................................................................................... 57

2.5.7

UART and Optical Interface........................................................................................... 58

2.5.8

Digital I/O and LCD Segment Drivers ............................................................................ 59

2.5.9

EEPROM Interface ........................................................................................................ 70

2.5.10 SPI Slave Port................................................................................................................ 73

2.5.11 Hardware Watchdog Timer............................................................................................ 78

2.5.12 Test Ports (TMUXOUT and TMUX2OUT Pins) ............................................................. 78

Functional Description ..................................................................................................................... 80

3.1

Theory of Operation ................................................................................................................... 80

3.2

Battery Modes ............................................................................................................................ 81

3.2.1

BRN Mode ..................................................................................................................... 83

3.2.2

LCD Mode...................................................................................................................... 83

3.2.3

SLP Mode ...................................................................................................................... 84

71M6542F/G Datasheet(PDF) 2 Page - Maxim Integrated Products

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