CS5490

4

DS982F3

LIST OF FIGURES

Figure 1. Oscillator Connections................................................................................................... 7

Figure 2. UART Serial Frame Format........................................................................................... 7

Figure 3. Active Energy Load Performance.................................................................................. 8

Figure 4. Reactive Energy Load Performance.............................................................................. 9

Figure 5. IRMS Load Performance ............................................................................................... 9

Figure 6. Signal Flow for V, I, P, and Q Measurements ............................................................. 15

Figure 7. Low-rate Calculations .................................................................................................. 16

Figure 8. Power-on Reset Timing ............................................................................................... 18

Figure 9. Zero-crossing Level and Zero-crossing Output on DO................................................ 19

Figure 10. Energy Pulse Generation and Digital Output Control ................................................ 20

Figure 11. Sag, Swell, & Overcurrent Detect.............................................................................. 21

Figure 12. Phase Sequence A, B, C for Rising Edge Transition ................................................ 22

Figure 13. Phase Sequence C, B, A for Rising Edge Transition ................................................ 23

Figure 14. Byte Sequence for Page Select................................................................................. 24

Figure 15. Byte Sequence for Register Read ............................................................................ 24

Figure 16. Byte Sequence for Register Write ............................................................................. 24

Figure 17. Byte Sequence for Instructions.................................................................................. 24

Figure 18. Byte Sequence for Checksum ................................................................................... 25

Figure 19. Calibration Data Flow ................................................................................................52

Figure 20. T Register vs. Force Temp ........................................................................................ 54

Figure 21. Typical Connection Diagram (Single-phase, Two-wire, Power Meter) ...................... 55

LIST OF TABLES

Table 1. POR Thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 2. Command Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Table 3. Instruction Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24