Maxim Integrated 71M6534 Energy Meter IC Family Software - Manual (Page 69)

71M653X Software User’s Guide
5.13 COMMON MPU ADDRESSES
In the Demo Code, certain MPU XRAM parameters have been given fixed addresses in order to permit easy external
access. These variables can be read via the command line interface (if available), with the )n$ command and written
with the )n=xx command where n is the word address. Note that accumulation variables are 64 bits long and are
accessed with )n$$ (read) and )n=hh=ll (write) in the case of accumulation variables.
Name Purpose LSB Default )? Signed? Bits
IThrshldA Starting current, element A
sqrt(i0sqsum)*(2 16 ),
0 in this position
disables creep logic for
both element A and B.
513421 (6531)
433199 (6533,
6534)
0.08A, just less
than 0.1A. Without
high-accuracy CE
code, the noise
floor is around
0.076A
)0 unsigned 32
Config
Configure meter operation on
the fly.
bit 0:** reserved;
0:VA=Vrms*Irms;
1:VA=sqrt(Wh
2 +VARh 2 )
bit1:
1=clear accumulators
(e.g. “)1=2”)
bit2:1=Calibration mode
bit3:**Reserved:
1=Enable Tamper 0
Do nothing
)1 N/A 8
VPThrshld sqrt(v0sqsum)*2 16
906156350 (6531)
764569660 (6533
& 6534)
240V*sqrt(2)
*120%
)2 unsigned 32 error if exceeded.
error if exceeded. sqrt(i0sqsum)*2 16
544498635 (6531)
275652520 (6533
& 6534)
50.9A
30A*sqrt(2) *120%
)3 unsigned IPThrshld 32
Y_Cal_Deg0 RTC adjust 100ppb
0
Read only at reset
in demo code.
)4 signed 16
Y_Cal_Deg1 RTC adjust, linear by temp. 10ppb*ΔT, in 0.1˚C 0 )5 signed 16
Y_Cal_Deg2 RTC adjust, squared by temp. 1ppb*ΔT 2 , in 0.1˚C 0 )6 signed 16
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