List of Figures

5

January 10, 2012

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