Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - power monitoring Single phase LQFP 64 Surface-mount

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

2 Rev 4

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 ............................................................................................................ 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

3 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