Maxim Integrated 71M6513H Power Meter IC Family Software - Manual (Page 77)

71M651x Software User’s Guide
MPU ACCUMULATION OUTPUT VARIABLES
Accumulation values are accumulated from XFER cycle to XFER cycle (see Table 5-9 and Table 5-10). They are all in
64-bit format. The 6511 has an LSB of 6.6925*10
-13 *VMAX*IMAX*In_8 Wh.
Accumulated values are calculated by summing the CE XFER outputs into 64 bit variables. Thus, the accumulators
will hold at least 136 years of data when XFER rate is 1Hz. The values calculated by the MPU are in XRAM according
to the following table.
XRAM
Word
Address
Name Description
0x2F reserved
0x31 reserved
0x33 reserved
0x35 reserved
0x37 reserved
0x39 Wh_A Total Watt hours consumed through phase A 1)
0x3B Whe_A Total Watt hours generated (inverse consumed) through phase A 1)
0x3D VARh_A Total VAR hours consumed through phase A 2)
0x3F VARhe_A Total VAR hours generated (inverse consumed) through phase A 2)
0x41 VAh_A Total VA hours in phase A 3)
0x43 Wh_B Total Watt hours consumed through phase B 1)
0x45 Whe_B Total Watt hours generated (inverse consumed) through phase B 1)
0x47 VARh_B Total VAR hours consumed through phase B 2)
0x49 VARhe_B Total VAR hours generated (inverse consumed) through phase B 2)
0x4B VAh_B Total VA hours in phase B 3)
0x4D reserved
0x4F reserved
0x51 reserved
0x53 reserved
0x55 reserved
1) : If EQU = 0, Wh_A = real component of IA*VA and Wh_B = real component of IB*VA.
If EQU = 1, Wh_A = real component of VA * (IA – IB)/2 and Wh_B = real component of VA*IB.
2) : If EQU = 0, VARh_A = reactive component of IA*VA and VARh_B = reactive component of IB*VA.
If EQU = 1, VARh_A = VA * (IA – IB)/2 and Wh_B = VA*IB.
3) : If EQU = 0, VAh_A = apparent power based on IA*VA and VAh_B = apparent power based on IB*VA.
If EQU = 1, VAh_A = apparent power based on VA * (IA – IB)/2 and VAh_B = apparent power based on
VA*IB.
Table 5-9: MPU Accumulation Output Variables (6511)
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