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71M6543 Demo Board User’s Manual
Table 1-7: MPU XRAM Locations
Name
Purpose
LSB
Default
)?
Signed?
Bits
Metering element
enters creep mode
if current is below
this value.
i_min
If 0, creep logic is
disabled. In creep
mode, on each me-
tering element, Wh,
VARh, i0sqsum,
and other items are
zeroed.
Same units as CE’s i0sqsum.
0.08A
)0
signed
32
bit0: 1=Display KWh.
bit1: 1=clear accumulators, er-
rors, etc. (e.g. “)1=2”)
bit2: 1=Reset demand. (e.g.
“)1=4”)
cfg
Configure meter
operation on the fly.
bit3: 1=CE Raw mode. MPU
does not change CE values with
creep or small current calcula-
tions.
bit5: 1= Send a message once
per second for IEC 62056-217
Mode D on UART 1, at 2400
BAUD, even parity. The meter’s
serial number and current Wh
display are sent as data. UART
1 is routed to an IR LED if pos-
sible. Mode D data fields are
prefaced with OBIS codes in
legacy format. 7,1
bit6: 1=Auto calibration mode 1
0
Do nothing spe-
cial.
)1
N/A
8
bit7: 1=Enable Tamper Detect
2,1
error if below. Also
creep.*
v_min
i_max
Below this, low volt-
age seconds are
counted. Voltage,
Wh, VARh, Fre-
quency, and other
voltage-dependent
items are zeroed.
Scaling Maximum
Amps for standard
sensor.
Same units as CE’s v0sqsum.
0.1A
40V
110.5 for 200
μOhm shunt
with 8x preamp.
884.0 A for 200
μOhm shunt ,
)2
)3
signed
signed
32
16
442.0A for 400
μOhm shunt.
v_max
i_limit
v_limit
Scaling Maximum
Volts for PCB
Error if exceeded.
Error if exceeded.*
0.1V
Same units as CE’s i0sqsum.
Same units as CE’s v0sqsum.
600 V, for the
Demo Board.
50.9A =
30A*sqrt(2)
*120%
407.3V =
240V*sqrt(2)
*120%
)4
)5
)6
signed
signed
signed
16
32
32
Page: 25 of 91
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