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71M6515H
A Maxim Integrated Products Brand
Energy Meter IC
DATA SHEET
JULY 2011
IASQSUM (0x39) , IBSQSUM (0x3A) , ICSQSUM (0x3B)
These registers hold the sum of the squared current samples collected during the previous accumulation interval. The
values for IASQSUM, IBSQSUM, and ICSQSUM are provided directly by the CE and are not post-processed. The magnitude
of the accumulated samples is determined by:
LSB =
IMAX 2
In _ 8 2
9 . 4045 ? 10 ? 13 A 2 h
IASQFRACT (0x4A) , IBSQFRACT (0x4B) , ICSQFRACT (0x4C)
These read-only registers hold the difference between the 10-bit residual squared current sum of the current accumulation
interval and the 10-bit residual squared current sum of the previous interval. If IASQSUM, IBSQSUM, or ICSQSUM are
used to calculate current, the value obtained over several accumulation intervals will be accurate due to averaging, but
the individual values will have a higher uncertainty than when using IASQFRACT, IBSQFRACT, and ICSQFRACT.
The most accurate calculation of the squared current for a phase X (IXSQ) uses the formula:
IXSQ = IXSQSUM + 2 -10 IXSQFRACT
INSQFRACT (0x4D)
This register holds the difference between the 10-bit residual squared neutral currents of the current accumulation interval
and the 10-bit residual squared neutral currents of the previous interval. The value can be used to improve the accuracy
of the squared neutral current reading by applying the formula:
INSQ = INSQSUM + 2
-10
INSQFRACT
INSQSUM (0x3C)
This register holds the sum of the square of the calculated neutral current collected during the previous accumulation
interval. The calculation is implementing the following equation:
INSQSUM = ∑ ( I 0 + I 1 + I 2 )
2
The magnitude of the accumulated samples is determined by:
In _ 8
LSB =
IMAX 2
2
9 . 4045 ? 10 ? 13 A 2 h
(inductive load). One LSB is equivalent to 1 degree. The range is from (2 – 1) to –(2 – 1). Since the phase calculation
IPHASE_ABC (0x0F)
This register holds voltage-to-current phase information for all three phases. Positive phase means lagging current
8 8
involves the post-processor , these registers will not be functional when the CE_ONLY bit in the CONFIG register is set.
Bits 8-0: These bits ( IPHASE_C ) represent the voltage-to-current phase angle in phase C.
Bits 17-9: These bits ( IPHASE_B ) represent the voltage-to-current phase angle in phase B.
Bits 26-18: These bits ( IPHASE_A ) represent the voltage-to-current phase angle in phase A.
IRMS_A (0x0C) , IRMS_B (0x0D) , IRMS_C (0x0E)
These registers hold the post-processed RMS current for each phase. Only the 16 most significant bits are used. The
magnitude of the values is determined by:
LSB =
6 . 8781 ? 10 ? 9 IMAX
In _ 8 SUM _ CYCLES
A rms
Page: 44 of 60
? 2005 ? 2011 Teridian Semiconductor Corporation
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