Maxim Integrated 71M6541 Demo Board - Manual (Page 25)

71M6541 Demo Board REV 3.0 User’s Manual
25 Rev 4.0
v_limit Error if exceeded.* Same units as CE’s v0sqsum.
407.3V =
240V*sqrt(2)
*120%
)6 signed 32
wrate_mpu
Convert from CE
counts to pulses.
CE’s w0sum units per pulse,
rounded up to next largest CE
count so Wh accumulation and
display is always rounded down. 3.2 Wh for 3-
phase
1.0 Wh for 1-
phase
)7 signed 32
interval
The number of
minutes of a de-
mand interval.
Count of minutes.
(60/interval)*interval = 60.
2 minutes. )8 unsigned 8
mains_hz
Expected number of
cycles per second
of mains. 0 disables
the software RTC
run from mains.
Hz 0 )9 unsigned 8
temp_cal1
Machine-readable
units per 0.1C
Refer to the IC data sheet.
Temperature is calculated as
temp = (measured_temp –
temp_datum)/temp_cal1 +
temp_cal0
Refer to the IC
data sheet.
)A signed 32
mtr_cal1
[0..3]
9
Linear temperature
calibration for meter
elements A..D.
ppm*(T -
mtr_datum), in 0.1˚C
150 )B..E signed 16
mtr_cal2
[0..3]
9
Squared tempera-
ture calibration for
meter elements
A..D.
ppm2*(T -
mtr_datum)2, in 0.1˚C -392
)F..1
2
signed 16
y_datum
Center temperature
of the crystal.
0.1C 25C )13 signed 16
y_cal1 5
RTC adjust, linear
by temp.
10ppb*(T -
y_datum), in 0.1˚C
0 )14 signed 16
y_cal2
5
RTC adjust,
squared by temp.
1ppb*(T -
y_datum)2, in 0.1˚C
38 )15 signed 16
s_cal
1
Accumulation inter-
vals of
Autocalibration
Count of accumulation intervals
of calibration.
accumulation
intervals cover
both chop polar-
ities.
)16 signed 16
v_cal 1
Volts of
Autocalibration 0.1V rms of AC signal applied to
all elements during calibration.
2400
240 V is a
standard full-
scale setup for
meter test.
)17 signed 16
i_cal 1
Amps of
Autocalibration
0.1A rms of AC signal applied to
all elements during calibration.
Power factor of calibration signal
must be 1.
300
30 A is a stand-
ard full-scale
setup for meter
test.
)18 signed 16