M90E26_14 datasheet(3/60 Pages) ATMEL

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M90E26 [DATASHEET]

Atmel-46002B-SE-M90E26-Datasheet_110714

Features............................................................................................................................................... 1

Application .......................................................................................................................................... 2

Description .......................................................................................................................................... 2

Block Diagram..................................................................................................................................... 2

1 Pin Assignment .............................................................................................................................. 7

2 Pin Description ............................................................................................................................... 8

3 Functional Description ................................................................................................................ 10

3.1 Dynamic Metering Range ........................................................................................................ 10

3.2 Startup and No-Load Power .................................................................................................... 10

3.3 Energy Registers ..................................................................................................................... 11

3.4 N Line Metering and Anti-Tampering ....................................................................................... 12

3.4.1 Metering Mode and L/N Line Current Sampling Gain Configuration ........................................... 12

3.4.2 Anti-Tampering Mode .................................................................................................................. 12

3.5 Measurement and Zero-Crossing ............................................................................................ 13

3.5.1 Measurement ............................................................................................................................... 13

3.5.2 Zero-Crossing .............................................................................................................................. 13

3.6 Calibration ................................................................................................................................ 14

3.7 Reset ........................................................................................................................................ 14

4 Interface ........................................................................................................................................ 15

4.1 SPI Interface ............................................................................................................................ 15

4.1.1 Four-Wire Mode ........................................................................................................................... 15

4.1.2 Three-Wire Mode ......................................................................................................................... 16

4.1.3 Timeout and Protection ............................................................................................................... 17

4.2 UART Interface ........................................................................................................................ 18

4.2.1 Byte Level Timing ........................................................................................................................ 18

4.2.2 Write Transaction ........................................................................................................................ 18

4.2.3 Read transaction ......................................................................................................................... 19

4.2.4 Checksum .................................................................................................................................... 19

4.3 WarnOut Pin for Fatal Error Warning ....................................................................................... 20

4.4 Low Cost Implementation in Isolation with MCU ...................................................................... 20

5 Register ......................................................................................................................................... 21

5.1 Register List ............................................................................................................................. 21

5.2 Status and Special Register ..................................................................................................... 22

5.3 Metering/ Measurement Calibration and Configuration ........................................................... 26

5.3.1 Metering Calibration and Configuration Register ......................................................................... 26

5.3.2 Measurement Calibration Register .............................................................................................. 34

5.4 Energy Register ....................................................................................................................... 39

5.5 Measurement Register ............................................................................................................. 44

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