Integrated Device Technology, Inc. reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best pos-
sible product. IDT does not assume any responsibility for use of any circuitry described other than the circuitry embodied in an IDT product. The Company makes no representations that circuitry
described herein is free from patent infringement or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent, patent rights or other
rights, of Integrated Device Technology, Inc.
LIFE SUPPORT POLICY
Integrated Device Technology's products are not authorized for use as critical components in life support devices or systems unless a specific written agreement pertaining to such intended use is exe-
cuted between the manufacturer and an officer of IDT.
1. Life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform, when properly used in
accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
2. A critical component is any components of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its
safety or effectiveness.
Table of Contents
FEATURES .............................................................................................................................................................................. 7
GENERAL DESCRIPTION ...................................................................................................................................................... 7
3 FUNCTION DESCRIPTION .............................................................................................................................................. 12
3.1
3.2
3.3
POWER SUPPLY .......................................................................................................................................................................................... 12
3.3.2 Power On Reset (POR) .................................................................................................................................................................. 12
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
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
3.5.6 Frequency ....................................................................................................................................................................................... 18
3.5.7 Temperature ................................................................................................................................................................................... 18
3.5.8 THD+N for Voltage and Current .................................................................................................................................................... 18
FOURIER ANALYSIS FUNCTION ................................................................................................................................................................ 19
POWER MODE .............................................................................................................................................................................................. 20
3.7.1 Normal Mode (N Mode) .................................................................................................................................................................. 20
3.7.2 Idle Mode (I Mode) .......................................................................................................................................................................... 21
3.7.5 Transition of Power Modes ........................................................................................................................................................... 25
3.8.2 Sag Detection ................................................................................................................................................................................. 26
3.8.3 Phase Loss Detection .................................................................................................................................................................... 26
3.8.4 Neutral Line Overcurrent Detection .............................................................................................................................................. 26
DC AND CURRENT RMS ESTIMATION ...................................................................................................................................................... 26
REGISTER LIST ............................................................................................................................................................................................ 33
SPECIAL REGISTERS .................................................................................................................................................................................. 40
6.2.2 IRQ and WarnOut Signal Generation ............................................................................................................................................ 41
6.2.3 Special Configuration Registers ................................................................................................................................................... 46
6.2.4 Last SPI Data Register ................................................................................................................................................................... 48
ENERGY REGISTER .................................................................................................................................................................................... 61
6.5.1 Regular Energy Registers ............................................................................................................................................................. 61
6.5.2 Fundamental / Harmonic Energy Register ................................................................................................................................... 63
6.6.1 Power and Power Factor Registers .............................................................................................................................................. 63
6.6.2 Fundamental/ Harmonic Power and Voltage/ Current RMS Registers ...................................................................................... 64
6.6.3 THD+N, Frequency, Angle and Temperature Registers ............................................................................................................. 65
POWER ON RESET TIMING ........................................................................................................................................................................ 74
VOLTAGE SAG AND PHASE LOSS TIMING .............................................................................................................................................. 76
ABSOLUTE MAXIMUM RATING .................................................................................................................................................................. 77
5.1
5.2
NORMAL MODE OPERATION CALIBRATION ........................................................................................................................................... 32
DMA Burst Transfer for ADC Sampling ........................................................................................................................................ 29
Control Sequence for External Device ......................................................................................................................................... 31
Power Mode Mapping ..................................................................................................................................................................................
Digital I/O and Power Pin States in Idle Mode .............................................................................................................................................
Register List .................................................................................................................................................................................................
Fundamental/Harmonic Energy Calibration Registers .................................................................................................................................
Regular Energy Registers ............................................................................................................................................................................
Fundamental / Harmonic Energy Register ...................................................................................................................................................
Power and Power Factor Register ...............................................................................................................................................................
Fundamental/ Harmonic Power and Voltage/ Current RMS Registers ........................................................................................................
THD+N, Frequency, Angle and Temperature Registers ..............................................................................................................................
Metering Accuracy for Different Energy within the Dynamic Range ............................................................................................................
Measurement Parameter Range and Format ..............................................................................................................................................
Power On Reset Specification .....................................................................................................................................................................
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