Single-Phase Power-Measurement

12 _____________________________________________________________________________________

Table 2. Register Set

NAME

DESCRIPTION

ACCESS

BITS

CMD CODE

P

Active power

R

23:0

0100 0010b (0x42)

Q

Reactive power

R

23:0

0011 0010b (0x32)

S

Apparent power

R

23:0

0011 1010b (0x3A)

PAVG

Average power

R

23:0

0101 1010b (0x5A)

VRMS

RMS-voltage

R

23:0

0100 1010b (0x4A)

IRMS

RMS-current

R

23:0

0101 0010b (0x52)

PF

R

23:0

0011 1100b (0x3C)

RAWTEMP

Temperature sample

R

15:0

0000 0111b (0x07)

PA

Phase-angle compensation coefficient

R/W

15:0

0010 0100b (0x24)

I_GAIN

Current gain coefficient

R/W

15:0

0010 1011b (0x2B)

V_GAIN

Voltage gain coefficient

R/W

15:0

0010 1010b (0x2A)

DSPCFG

DSP configuration

R/W

15:0

0010 0010b (0x22)

LPFC

Lowpass filter compensation

R/W

15:0

0010 0011b (0x23)

SUMCNT

Number of sampling frames per DSP cycle

R/W

15:0

0011 0100b (0x34)

ADC_AZ

ADC autozero operation. The master issues this command only

when it is initializing the MAXQ314. Any value written to this

register initiates a reset of the ADC, which takes approximately

1.5ms to complete.

W

7:0

0000 1111b (0x0F)

P_OFFS

Offset added to the P register

R/W

15:0

84

P_GAIN

Gain added to the P register

R/W

15:0

8c

IK

Correction factor for IRMS calculation

R/W

15:0

B2

IGV

Voltage-dependent gain correction factor for IRMS calculation

R/W

15:0

ba

I_OFFS

Offset for IRMS calculation

R/W

15:0

ac

I_OV

Voltage-dependent offset for IRMS calculation

R/W

15:0

ac