Datasheet

71M6543F/71M6543G Data Sheet
v2 121
The CE pulse generator can be controlled by either the MPU (external) or CE (internal) variables. Control is by
the MPU if the EXT_PULSE bit = 1 (CE RAM 0x20[5]). In this case, the MPU controls the pulse rate (external
pulse generation) by placing values into APULSEW and APULSER (CE RAM 0x45 and 0x49). By setting
EXT_PULSE = 0, the CE controls the pulse rate based on WSUM_X (CE RAM 0x84) and VARSUM_X (CE
RAM 0x88).
The 71M6543 Demo Code creep function halts both internal and external pulse generation.
Table 77: Sag Threshold, Phase Measurement, and Gain Adjust Control
CE
Address
Name Default Description
0x24
SAG_THR
2.39*10
7
The voltage threshold for sag warnings. The default value is
equivalent to 80VRMS if VMAX = 600V.
SAG_THR =





.

0x40
GAIN_ADJ0
16384
The assignments of these gain adjustments depends on the
meter design. See 4.5.4 Temperature Compensation for VREF
and Shunt Sensors on page 89 or 4.5.5 Temperature
Compensation of VREF and Current Transformers on page 90.
The default value of 16384 corresponds to unity gain.
0x41
GAIN_ADJ1
16384
0x42
GAIN_ADJ2
16384
0x43
GAIN_ADJ3
16384
0x44
GAIN_ADJ4
16384
5.3.8 CE Transfer Variables
When the MPU receives the XFER_BUSY interrupt, it knows that fresh data is available in the transfer
variables. CE transfer variables are modified during the CE code pass that ends with an XFER_BUSY
interrupt. They remain constant throughout each accumulation interval. In this data sheet, the names of
CE transfer variables always end with _X. The transfer variables can be categorized as:
• Fundamental energy measurement variables
• Instantaneous (RMS) values
• Other measurement parameters
Fundamental Energy Measurement Variables
Table 78 describes each transfer variable for fundamental energy measurement. All variables are signed
32-bit integers. Accumulated variables such as WSUM are internally scaled so they have at least 2x
margin before overflow when the integration time is one second. Additionally, the hardware does not permit
output values to fold back upon overflow.
Table 78: CE Transfer Variables (with Shunts)
CE
Address
Name Description Configuration
0x84
WSUM_X
The signed sum: W0SUM_X+W1SUM_X+W2SUM_X.
Figure 31 (page 86)
0x85
W0SUM_X
The sum of Wh samples from each wattmeter
element.
LSB
W
= 7.7562*10
-13
VMAX * IMAX Wh.
0x86
W1SUM_X
0x87
W2SUM_X
0x88
VARSUM_X
The signed sum:
VAR0SUM_X+VAR1SUM_X+VAR2SUM_X.
0x89
VAR0SUM_X
The sum of VARh samples from each wattmeter
element.
LSB
W
= 7.7562*10
-13
VMAX * IMAX VARh.
0x8A
VAR1SUM_X
0x8B
VAR2SUM_X