90E36 Datasheet, PDF (3/79 Pages) Integrated Device Technology – Poly-Phase High-Performance Wide-Span Energy Metering IC

Table of Contents
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 METERING FUNCTION ................................................................................................................................................................................ 13
3.4.1 Theory of Energy Registers .......................................................................................................................................................... 13
3.4.2 Energy Registers ............................................................................................................................................................................ 15
3.4.3 Energy Pulse Output ...................................................................................................................................................................... 15
3.4.4 Startup and No-load Power ........................................................................................................................................................... 15
3.5 MEASUREMENT FUNCTION ....................................................................................................................................................................... 17
3.5.1 Active/ Reactive/ Apparent Power ................................................................................................................................................ 17
3.5.2 Fundamental / Harmonic Active Power ........................................................................................................................................ 17
3.5.3 Mean Power Factor (PF) ................................................................................................................................................................ 17
3.5.4 Voltage / Current RMS ................................................................................................................................................................... 17
3.5.5 Phase Angle .................................................................................................................................................................................... 18
3.5.6 Frequency ....................................................................................................................................................................................... 18
3.5.7 Temperature ................................................................................................................................................................................... 18
3.5.8 THD+N for Voltage and Current .................................................................................................................................................... 18
3.6 FOURIER ANALYSIS FUNCTION ................................................................................................................................................................ 19
3.7 POWER MODE .............................................................................................................................................................................................. 20
3.7.1 Normal Mode (N Mode) .................................................................................................................................................................. 20
3.7.2 Idle Mode (I Mode) .......................................................................................................................................................................... 21
3.7.3 Detection Mode (D Mode) .............................................................................................................................................................. 23
3.7.4 Partial Measurement mode (M Mode) ........................................................................................................................................... 24
3.7.5 Transition of Power Modes ........................................................................................................................................................... 25
3.8 EVENT DETECTION ..................................................................................................................................................................................... 26
3.8.1 Zero-Crossing Detection ............................................................................................................................................................... 26
3.8.2 Sag Detection ................................................................................................................................................................................. 26
3.8.3 Phase Loss Detection .................................................................................................................................................................... 26
3.8.4 Neutral Line Overcurrent Detection .............................................................................................................................................. 26
3.8.5 Phase Sequence Error Detection ................................................................................................................................................. 26
3.9 DC AND CURRENT RMS ESTIMATION ...................................................................................................................................................... 26
4 SPI / DMA INTERFACE .................................................................................................................................................... 27
4.1 INTERFACE DESCRIPTION ......................................................................................................................................................................... 27
4.2 SLAVE MODE: SPI INTERFACE .................................................................................................................................................................. 28
4.2.1 SPI Slave Interface Format ............................................................................................................................................................ 28
4.2.2 Reliability Enhancement Feature .................................................................................................................................................. 28
4.3 MASTER MODE: DMA .................................................................................................................................................................................. 29
Table of Contents
3
December 9, 2011