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April 2, 2013

FEATURES.............................................................................................................................................................................. 6

APPLICATION......................................................................................................................................................................... 6

DESCRIPTION......................................................................................................................................................................... 6

BLOCK DIAGRAM .................................................................................................................................................................. 7

1 PIN ASSIGNMENT ............................................................................................................................................................. 9

2 PIN DESCRIPTION .......................................................................................................................................................... 10

3 FUNCTIONAL DESCRIPTION ......................................................................................................................................... 12

3.1 DYNAMIC METERING RANGE .................................................................................................................................................................... 12

3.2 STARTUP AND NO-LOAD POWER ............................................................................................................................................................. 12

3.3 ENERGY REGISTERS .................................................................................................................................................................................. 12

3.4 N LINE METERING AND ANTI-TAMPERING .............................................................................................................................................. 13

3.4.1 Metering Mode and L/N Line Current Sampling Gain Configuration ......................................................................................... 13

3.4.2 Anti-Tampering Mode .................................................................................................................................................................... 13

3.5 MEASUREMENT AND ZERO-CROSSING ................................................................................................................................................... 14

3.5.1 Measurement .................................................................................................................................................................................. 14

3.5.2 Zero-Crossing ................................................................................................................................................................................. 14

3.6 CALIBRATION .............................................................................................................................................................................................. 15

3.7 RESET ........................................................................................................................................................................................................... 15

4 INTERFACE ..................................................................................................................................................................... 16

4.1 SERIAL PERIPHERAL INTERFACE (SPI) ................................................................................................................................................... 16

4.1.1 Four-Wire Mode .............................................................................................................................................................................. 16

4.1.2 Three-Wire Mode ............................................................................................................................................................................ 17

4.1.3 Timeout and Protection ................................................................................................................................................................. 18

4.2 WARNOUT PIN FOR FATAL ERROR WARNING ....................................................................................................................................... 18

4.3 LOW COST IMPLEMENTATION IN ISOLATION WITH MCU ...................................................................................................................... 18

5 REGISTER ........................................................................................................................................................................ 19

5.1 REGISTER LIST ............................................................................................................................................................................................ 19

5.2 STATUS AND SPECIAL REGISTER ............................................................................................................................................................ 21

5.3 METERING/ MEASUREMENT CALIBRATION AND CONFIGURATION .................................................................................................... 25

5.3.1 Metering Calibration and Configuration Register ....................................................................................................................... 25

5.3.2 Measurement Calibration Register ............................................................................................................................................... 32

5.4 ENERGY REGISTER .................................................................................................................................................................................... 37

5.5 MEASUREMENT REGISTER ....................................................................................................................................................................... 41

6 ELECTRICAL SPECIFICATION ....................................................................................................................................... 48

6.1 ELECTRICAL SPECIFICATION ................................................................................................................................................................... 48

6.2 SPI INTERFACE TIMING .............................................................................................................................................................................. 50

6.3 POWER ON RESET TIMING ........................................................................................................................................................................ 51

6.4 ZERO-CROSSING TIMING ........................................................................................................................................................................... 51

6.5 VOLTAGE SAG TIMING ............................................................................................................................................................................... 52

6.6 PULSE OUTPUT ........................................................................................................................................................................................... 52

6.7 ABSOLUTE MAXIMUM RATING .................................................................................................................................................................. 53

PACKAGE DIMENSIONS...................................................................................................................................................... 54

ORDERING INFORMATION.................................................................................................................................................. 57

Table of Contents