71M6531D Datasheet, PDF (89/115 Pages) Teridian Semiconductor Corporation – Energy Meter IC

FDS 6531/6532 005
[5]
EXT_PULSE
1
[4]
–
0
[3]
IB_SHUNT
0
[2]
IA_SHUNT
0
[1]
PULSE_FAST
0
[0]
PULSE_SLOW 0
Data Sheet 71M6531D/F-71M6532D/F
When zero, causes the pulse generators to respond to internal
data (PULSE0 = WSUM_X, PULSE1 = VARSUM_X., PULSE2 =
VASUM_X). Otherwise, the generators respond to values the
MPU places in APULSEW and APULSER.
Unused.
When 1, the current gain of channel B is increased by 8. The
gain factor controlled by In_SHUNT is referred to as In_8
throughout this document.
When 1, the current gain of channel A is increased by 8.
When PULSE_FAST = 1, the pulse generator input is increased
16x. When PULSE_SLOW = 1, the pulse generator input is
reduced by a factor of 64. These two bits control the pulse
gain factor X (see table below). Default is 0 for both (X = 6).
PULSE_SLOW
0
0
1
1
PULSE_FAST
0
1
0
1
X
1.5 * 2² = 6
1.5 * 2⁶ = 96
1.5 * 2^-4 = 0.09375
Do not use
CE Ad-
dress
0x24
Name
SAG_THR
Table 53: Sag Threshold Control
Default
Description
The threshold for sag warnings. The default value is
443000 equivalent to 80 V RMS if VMAX = 600 V. The LSB value
is VMAX * 4.255*10^-7 V (peak).
CE Ad-
dress
0x40
Name
GAIN_ADJ
Table 54: Gain Adjust Control
Default
Description
16384
This register scales all voltage and current channels. The
default value is equivalent unity gain (1.000).
4.3.7 CE Transfer Variables
When the MPU receives the XFER_BUSY interrupt, it knows that fresh data is available in the transfer
variables. The transfer variables can be categorized as:
1. Fundamental energy measurement variables
2. Instantaneous (RMS) values
3. Other measurement parameters
Fundamental Energy Measurement Variables
Table 55 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 will not per-
mit output values to fold back upon overflow.
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