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AS8268

Single-Phase 2-Current Energy Measurement Integrated Circuits with Microcontroller, RTC, Programmable Multi-Purpose I/Os, LCD Driver and On-Chip FLASH Memory

austriamicrosystems AG 

Data Sheet AS8267 / AS8268

Table of Contents

1. Key Features .........................................................................................................................................1

2. General Description ...............................................................................................................................1

3. Typical Application Circuit ......................................................................................................................3

4. Pin Out..................................................................................................................................................4

5. Pin Description ......................................................................................................................................4

6. Electrical Characteristics........................................................................................................................8

6.1 Absolute Maximum Ratings (Non-Operating) ......................................................................................8

6.2 Operating Conditions ........................................................................................................................8

6.3 DC/AC Characteristics for Digital Inputs and Outputs..........................................................................9

6.4 Electrical System Specification ........................................................................................................ 10

7. Performance Graphs ............................................................................................................................ 12

8. Detailed Functional Description ............................................................................................................ 15

8.1 Energy Measurement Front End (Including DSP) .............................................................................. 17

8.2 Temperature Sensor ....................................................................................................................... 50

8.3 LCD Driver (LCDD) ......................................................................................................................... 52

8.4 Programmable Multi-Purpose I/Os (MPIO)........................................................................................ 57

8.5 Serial Peripheral Interface (SPI) ...................................................................................................... 67

8.6 External EEPROM Requirements ..................................................................................................... 78

8.7 FLASH Memory............................................................................................................................... 83

8.8 8051 Microcontroller (MCU)............................................................................................................. 90

8.9 System Control (SCT) ................................................................................................................... 110

8.10 Serial Interface – UART1............................................................................................................... 118

9. Circuit Diagram.................................................................................................................................. 127

10. Parts List........................................................................................................................................... 128

11. Packaging ......................................................................................................................................... 130

12. Product Ordering Guide ..................................................................................................................... 130

13. Collection of Formulae ....................................................................................................................... 131

14. Terminology ...................................................................................................................................... 135

15. Revision ............................................................................................................................................ 136

16. Copyright .......................................................................................................................................... 136

17. Disclaimer ......................................................................................................................................... 136

18. Contact ............................................................................................................................................. 136

Revision 1.0, 19-Jun-07

Page 7 of 136

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