Data Sheet AS8218 / AS8228
Table of Contents
1.
2.
3.
4.
5.
6.
Key Features .........................................................................................................................................1
General Description ...............................................................................................................................1
Typical Application Circuit ......................................................................................................................3
Pin Out..................................................................................................................................................4
Pin Description ......................................................................................................................................4
Electrical Characteristics........................................................................................................................9
6.1
Absolute Maximum Ratings (Non-Operating) ......................................................................................9
6.2
Operating Conditions ........................................................................................................................9
6.3
DC/AC Characteristics for Digital Inputs and Outputs........................................................................ 10
6.4
Electrical System Specification ........................................................................................................ 11
Performance Graphs ............................................................................................................................ 12
Detailed Functional Description ............................................................................................................ 14
8.1
Energy Measurement Front End (Including DSP) .............................................................................. 16
8.2
LCD Driver (LCDD) ......................................................................................................................... 48
8.3
Programmable Multi-Purpose I/Os (MPIO) ........................................................................................ 54
8.4
Serial Peripheral Interface (SPI) ...................................................................................................... 64
8.5
External EEPROM Requirements ..................................................................................................... 70
8.6
8051 Microcontroller (MCU) ............................................................................................................. 77
8.7
System Control (SCT) ..................................................................................................................... 98
8.8
Serial Interface – UART1............................................................................................................... 105
Circuit Diagram.................................................................................................................................. 114
7.
8.
9.
10. Parts List........................................................................................................................................... 115
11. Packaging ......................................................................................................................................... 117
12. Product Ordering Guide ..................................................................................................................... 117
13. Collection of Formulae ....................................................................................................................... 118
14. Terminology ...................................................................................................................................... 121
15. Revision ............................................................................................................................................ 122
16. Copyright .......................................................................................................................................... 122
17. Disclaimer ......................................................................................................................................... 122
18. Contact ............................................................................................................................................. 123
Revision 3.0, 31-May-06
Page 8 of 123
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