71M6515H-IGT/F Maxim Integrated Products, 71M6515H-IGT/F Datasheet - Page 45

• Manufacturer Part Number: 71M6515H-IGT/F
• Description: IC ENERGY METER AFE 3PH 64-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of 71M6515H-IGT/F

• Mounting Style: SMD/SMT
• Package / Case: LQFP-64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

VASQSUM (0x3D), VBSQSUM (0x3E), VCSQSUM (0x3F)
VAH_A (0x06), VAH_B (0x07), VAH_C (0x08)
Since the VAh calculation involves the post-processor, these registers will not be functional when the CE_ONLY bit in the
CONFIG register is set.
VARH_A (0x03), VARH_B (0x04), VARH_C (0x05)
VPHASE_ABC (0x10)
VRMS_A (0x09), VRMS_B (0x0A), VRMS_C (0x0B)
Page: 45 of 60
Since the RMS calculation involves the post-processor, these registers will not be functional when the CE_ONLY bit in the
CONFIG register is set. If higher precision is required, the host must calculate the RMS currents from the values in the
IASQSUM, IBSQSUM, and ICSQSUM registers. For even higher precision, the IASQFRACT, IBSQFRACT, ICSQFRACT
registers should be used.
These registers hold the sum of the squared voltage samples collected during the previous accumulation interval. The
values for VASQSUM, VBSQSUM, and VCSQSUM are provided directly by the CE and are not post-processed. The
magnitude of the accumulated samples is determined by:
These registers hold the apparent energy collected during the previous accumulation interval. The magnitude of the
accumulated samples is determined by:
These registers hold the reactive energy collected during the previous accumulation interval. The magnitude of the
accumulated samples is determined by:
This register holds the phase angle between the voltages of phases A/C and A/B. The LSB is one degree.
Bits 15-0: These bits (VPHASE_AC) hold the phase angle between VA and VC.
Bits 31-16: These bits (VPHASE_AB) hold the phase angle between VA and VB.
These registers hold the post-processed RMS voltage for each phase. Only the 16 most significant bits are used. The
magnitude of the values is determined by:
Since the RMS calculation involves the post-processor, these registers will not be functional when the CE_ONLY bit in the
CONFIG register is set.
LSB
LSB
LSB
LSB
=
=
=
=
. 6
. 9
. 9
VMAX
8781
SUM
A Maxim Integrated Products Brand
4045
4045
Example: The register IRMS_C reads the value 2,079,670. Assuming IMAX to be 208A, and using the formula
above, we determine the RMS current of phase C to:
I
RMS
⋅
10
_
⋅
⋅
10
CYCLES
10
9 −
=
2
VMAX
. 9
−
2079670
−
13
13
4045
VMAX
VMAX
In
In
V
⋅
⋅
. 6
10
_
rms
IMAX
_
8781
IMAX
8
8
−
13
⋅
V
60
10
2
© 2005−2011 Teridian Semiconductor Corporation
−
h
9
VARh
208
VAh
=
. 0
0385
A
Energy Meter IC
DATA SHEET
71M6515H
JULY 2011
1.6