Maxim Integrated 71M6541 Demo Board - Manual (Page 27)

71M6541 Demo Board REV 3.0 User’s Manual
27 Rev 4.0
i_max2 4
Like i_max, except
for the 2nd current
sensor.
Currents, Wh etc.
using currents from
the second sensor
are rescaled into the
same units as the
first current sensor.
0.1 Amps 208 A (2080) )1C signed 16
in_limit
3
Maximum valid neu-
tral current.
Same units as CE’s i3sqsum. 0.1A )1D signed 32
in_wait 3
The time that neu-
tral current can ex-
ceed n_max before
the neutral error is
asserted.
Count of accumulation intervals. 10 secs. )1E signed 16
Reserved )1F
meter_id 8
Identification num-
ber of meter.
32 bit unsigned number. For
AMR demonstrations, this is
sent in decimal as the identifica-
tion number of the meter.
100000000 )20 signed 32
temp_datum 8
Count of tempera-
ture sensor at cali-
bration.
Refer to the IC data sheet.
Temperature is calculated as
temp = (measured_temp –
temp_datum)/temp_cal1 +
temp_cal0
n/a )21 signed 32
mtr_datum[0.
.3]
8
Center temperature
of a meter element’s
temperature curve.
0.1C 22C
)22..
25
signed 16
rtca_adj
8
Default value for
RTCA_ADJ, the
crystal’s capacitor
adjustment.
Refer to the IC data sheet. Set
from hardware value when
hardware is changed.
Hardware de-
fault (refer to
the IC data
sheet).
)26 unsigned 8
y_cal0 5,
8
RTC offset rate ad-
just
100ppb 0 )27 signed 16
v_bat_min 8
Minimum valid bat-
tery voltage. Units of hardware’s battery
measurement register.
2V on a real
PCB; should be
adjusted for
battery and
chip.
)28 signed 32
cal_cnt
Count of calibra-
tions. In demo code,
it also checks ad-
justments.
Counts number of times calibra-
tion is saved, to a maximum of
255.
0 )29 unsigned 8
ver_hash
Checked to prevent
old calibration data
from being used by
new code. Value
that changes with
the banner text, and
therefore with the
version, date and
time.
Uses data_ok() to calculate a
value from the string.
n/a )2A unsigned 8
data_ok_cal
Checks calibrations.
In demo code, it
also checks adjust-
ments.
Checked by data_ok() of calibra-
tion value.
n/a )2B unsigned 16
Reserved
)2C.
)2F