Datasheet

Table of Contents 3 April 2, 2013
FEATURES.............................................................................................................................................................................. 7
APPLICATION......................................................................................................................................................................... 7
GENERAL DESCRIPTION ...................................................................................................................................................... 7
BLOCK DIAGRAM .................................................................................................................................................................. 8
1 PIN ASSIGNMENT ............................................................................................................................................................. 9
2 PIN DESCRIPTION .......................................................................................................................................................... 10
3 FUNCTION DESCRIPTION .............................................................................................................................................. 12
3.1 POWER SUPPLY .......................................................................................................................................................................................... 12
3.2 CLOCK .......................................................................................................................................................................................................... 12
3.3 RESET ........................................................................................................................................................................................................... 12
3.3.1 RESET Pin ....................................................................................................................................................................................... 12
3.3.2 Power On Reset (POR) .................................................................................................................................................................. 12
3.3.3 Software Reset ............................................................................................................................................................................... 12
3.4 ANALOG/DIGITAL CHANNEL MAPPING .................................................................................................................................................... 13
3.5 METERING FUNCTION ................................................................................................................................................................................ 14
3.5.1 Theory of Energy Registers .......................................................................................................................................................... 14
3.5.2 Energy Registers ............................................................................................................................................................................ 16
3.5.3 Energy Pulse Output ...................................................................................................................................................................... 16
3.5.4 Startup and No-load Power ........................................................................................................................................................... 17
3.6 MEASUREMENT FUNCTION ....................................................................................................................................................................... 19
3.6.1 Active/ Reactive/ Apparent Power ................................................................................................................................................ 19
3.6.2 Fundamental / Harmonic Active Power ........................................................................................................................................ 19
3.6.3 Mean Power Factor (PF) ................................................................................................................................................................ 19
3.6.4 Voltage / Current RMS ................................................................................................................................................................... 19
3.6.5 Phase Angle .................................................................................................................................................................................... 20
3.6.6 Frequency ....................................................................................................................................................................................... 20
3.6.7 Temperature ................................................................................................................................................................................... 20
3.6.8 Peak Value ...................................................................................................................................................................................... 20
3.7 POWER QUALITY MONITORING ................................................................................................................................................................ 21
3.7.1 Instantaneous Signal Monitoring .................................................................................................................................................. 21
3.7.2 Instantaneous Signal Related Status And Events ...................................................................................................................... 21
3.7.3 Frequency Monitoring Related Status And Events ..................................................................................................................... 22
3.7.4 Zero-Crossing Detection ............................................................................................................................................................... 22
3.7.5 Neutral Line Overcurrent Detection .............................................................................................................................................. 22
3.7.6 Phase Sequence Error Detection ................................................................................................................................................. 22
3.8 POWER MODE .............................................................................................................................................................................................. 23
3.8.1 Normal Mode (N Mode) .................................................................................................................................................................. 23
3.8.2 Idle Mode (I Mode) .......................................................................................................................................................................... 24
3.8.3 Detection Mode (D Mode) .............................................................................................................................................................. 26
3.8.4 Partial Measurement mode (M Mode) ........................................................................................................................................... 27
3.8.5 Transition of Power Modes ........................................................................................................................................................... 28
3.9 EXTERNAL COMPONENT COMPENSATION ............................................................................................................................................. 29
3.9.1 Gain Based Compensation ........................................................................................................................................................... 29
3.9.2 Delay/Phase Based Compensation .............................................................................................................................................. 30
4 SPI INTERFACE ............................................................................................................................................................... 31
4.1 INTERFACE DESCRIPTION ......................................................................................................................................................................... 31
4.2 SPI INTERFACE ............................................................................................................................................................................................ 32
Table of Contents