Introduction
1 Definitions, Acronyms and Abbreviations
2 Overall Description
3 Metrology Interface Definition
- 3.1 Metrology Control Registers
- 3.2 Metrology Status Registers
  - 3.2.1 Metrology Firmware Version
    Metrology Firmware Version
  - 3.2.2 Metrology Status Register
    Metrology Status Register
  - 3.2.3 Metrology State Flags Register
    Metrology State Flags Register
  - 3.2.4 Waveform Capture Function Status
    Waveform Capture Function Status
  - 3.2.5 Measurement Interval Number
    Measurement Interval Number
  - 3.2.6 Number of Samples in the Last Measurement Interval
    Number of Samples in the Last Measurement Interval
  - 3.2.7 Phase Correction Filter Offset
    Phase Correction Filter Offset
  - 3.2.8 Dominant Line Voltage Fundamental Harmonic Frequency
    Dominant Line Voltage Fundamental Harmonic Frequency
  - 3.2.9 Line Voltage Fundamental Harmonic Frequency
    Line Voltage Fundamental Harmonic Frequency
  - 3.2.10 Sensor Temperature
    Sensor Temperature
  - 3.2.11 Voltage Peak Registers
    Voltage Peak Registers
  - 3.2.12 Phase Current Peak Registers
    Phase Current Peak Registers
  - 3.2.13 Neutral Current Peak Registers
    Neutral Current Peak Registers
  - 3.2.14 Compiled Feature Indicator Bits
    Compiled Feature Indicator Bits
  - 3.2.15 Number of Samples in the Last Cycle
    Number of Samples in the Last Cycle
  - 3.2.16 Pulse Counters
    Pulse Counters
  - 3.2.17 Zero-Crossing Sample Number of Phase-X Voltage
    Zero-Crossing Sample Number of Phase-X Voltage
  - 3.2.18 ATSENSE Calibration Trim Data, Registers: 0x41 – 0x44
    ATSENSE Calibration Trim Data, Registers: 0x41 – 0x44
  - 3.2.19 ATSENSE Calibration Trim Data, Registers: 0x45 – 0x48
    ATSENSE Calibration Trim Data, Registers: 0x45 – 0x48
- 3.3 Accumulated Output Quantities
- 3.4 Per-Cycle Accumulated Output Quantities
- 3.5 Harmonic Analysis Output Quantities
- 3.6 Derived Output Quantities
4 Interface between Metrology and Application
5 Annex – Meter Forms
The service type determines what meter form is being implemented and how the Metrology DSP core interprets and processes the ADC values.
6 References
7 Revision History
Microchip Information

3.2.17 Zero-Crossing Sample Number of Phase-X Voltage

Name:	ZC_N_Vx
Property:	Read


Bit	31	30	29	28	27	26	25	24

Access
Reset


Bit	23	22	21	20	19	18	17	16
	ZC_COUNT_Vx[23:16]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	15	14	13	12	11	10	9	8
	ZC_COUNT_Vx[15:8]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	7	6	5	4	3	2	1	0
	ZC_COUNT_Vx[7:0]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0

Bits 23:0 – ZC_COUNT_Vx[23:0] Zero Crossing Count (uQ20.12)

Zero-crossing sample count of last positive-going zero-crossing of the V_x [x = A, B, C] phase voltage channel, in units of the 4 kHz sample rate. Use this to compare with other voltage phases to determine relative phase order.

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