78M6612 Data Sheet

DS_6612_001

2

Rev 2

Table of Contents

1

Hardware Description....................................................................................................................7

1.1 Hardware Overview.................................................................................................................7

1.2 Analog Front End (AFE)..........................................................................................................8

1.2.1 Input Multiplexer..........................................................................................................8

1.2.2 A/D Converter (ADC)...................................................................................................9

1.2.3 FIR Filter .....................................................................................................................9

1.2.4 Voltage References.....................................................................................................9

1.2.5 Temperature Sensor....................................................................................................9

1.2.6 Battery Monitor............................................................................................................9

1.3 Digital Computation Engine (CE)...........................................................................................10

1.3.1 Real-Time Monitor.....................................................................................................10

1.3.2 Pulse Generator ........................................................................................................10

1.3.3 Data RAM (XRAM)....................................................................................................10

1.4 80515 MPU Core ..................................................................................................................11

1.4.1 UARTs ......................................................................................................................11

1.5 On-Chip Resources...............................................................................................................11

1.5.1 Oscillator...................................................................................................................11

1.5.2 PLL and Internal Clocks.............................................................................................11

1.5.3 Real-Time Clock (RTC) .............................................................................................12

1.5.4 Temperature Sensor..................................................................................................12

1.5.5 Flash Memory ...........................................................................................................12

1.5.6 Optical Interface........................................................................................................13

1.5.7 Digital I/O ..................................................................................................................13

1.5.8 LCD Drivers ..............................................................................................................16

1.5.9 EEPROM Interface....................................................................................................16

1.5.10 Hardware Watchdog Timer........................................................................................17

1.5.11 Test Ports (TXUXOUT pin) ........................................................................................17

2

Functional Description ................................................................................................................18

2.1 Theory of Operation ..............................................................................................................18

2.2 Fault and Reset Behavior......................................................................................................19

2.2.1 Reset Mode...............................................................................................................19

2.2.2 Power Fault Circuit....................................................................................................19

2.3 Data Flow .............................................................................................................................19

2.4 CE/MPU Communication ......................................................................................................20

3

Application Information...............................................................................................................21

3.1 Connection of Sensors (CT, Resistive Shunt)........................................................................21

3.2 Connecting 5 V Devices........................................................................................................22

3.3 Temperature Measurement...................................................................................................22

3.4 Temperature Compensation..................................................................................................22

3.5 Connecting LCDs..................................................................................................................23

3.6 Connecting I2C EEPROMs....................................................................................................23

3.7 Connecting Three-Wire EEPROMs .......................................................................................24

3.8 UART0 (TX0/RX0) ................................................................................................................24

3.9 UART1 (TX1/RX1) ................................................................................................................25

3.10 Connecting V1 and Reset Pins..............................................................................................25

3.11 Connecting the Emulator Port Pins........................................................................................26

3.12 Flash Programming...............................................................................................................26

3.13 MPU Firmware Library ..........................................................................................................26

3.14 Crystal Oscillator...................................................................................................................26

3.15 Measurement Calibration ......................................................................................................27

4

Electrical Specifications..............................................................................................................28

4.1 Absolute Maximum Ratings...................................................................................................28

4.2 Recommended External Components ...................................................................................29