90E21 Datasheet, PDF (5/57 Pages) Integrated Device Technology – Single-Phase High-Performance Wide-Span Energy Metering IC

List of Figures
Figure-1 90E21 Block Diagram .................................................................................................................................................................................... 7
Figure-2 90E22 Block Diagram .................................................................................................................................................................................... 7
Figure-3 90E23 Block Diagram .................................................................................................................................................................................... 8
Figure-4 90E24 Block Diagram .................................................................................................................................................................................... 8
Figure-5 Pin Assignment (Top View) ............................................................................................................................................................................ 9
Figure-6 Read Sequence in Four-Wire Mode ............................................................................................................................................................ 16
Figure-7 Write Sequence in Four-Wire Mode ............................................................................................................................................................. 16
Figure-8 Read Sequence in Three-Wire Mode .......................................................................................................................................................... 17
Figure-9 Write Sequence in Three-Wire Mode ........................................................................................................................................................... 17
Figure-10 4-Wire SPI Timing Diagram ......................................................................................................................................................................... 50
Figure-11 3-Wire SPI Timing Diagram ......................................................................................................................................................................... 50
Figure-12 Power On Reset Timing Diagram ................................................................................................................................................................ 51
Figure-13 Zero-Crossing Timing Diagram ................................................................................................................................................................... 51
Figure-14 Voltage Sag Timing Diagram ...................................................................................................................................................................... 52
Figure-15 Output Pulse Width ..................................................................................................................................................................................... 52
List of Figures
5
January 10, 2012