71M6533 Datasheet, PDF (100/132 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6533/G/H and 71M6534/H Data Sheet
FDS_6533_6534_004
When PULSE_FAST = 1, the pulse generator input is increased
16x. When PULSE_SLOW = 1, the pulse generator input is
[1]
PULSE_FAST
0
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 PULSE_FAST
X
0
0
1.5 * 2² = 6
[0]
PULSE_SLOW
0
0
1
1
1.5 * 2⁶ = 96
0
1.5 * 2^-4 = 0.09375
1
1
Do not use
CE
Address
0x24
0x40
Table 59: Sag Threshold and Gain Adjust Control
Name
SAG_THR
GAIN_ADJ
Default Description
2.39*10⁷
16384
The voltage threshold for sag warnings. The default value is
equivalent to 80 V RMS if VMAX = 600 V. The LSB value is
VMAX * 7.8798*10^-9 V. For example, if a sag threshold of 80
V RMS is required:
SAG _THR
=
VMAX
80 ⋅ 2
⋅ 7.8798
⋅10^−9
= 2.39 ⋅10⁷
This register scales all voltage and current channels. The
default value is equivalent to unity gain (1.000).
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:
1. Fundamental energy measurement variables
2. Instantaneous (RMS) values
3. Other measurement parameters
Fundamental Energy Measurement Variables
Table 60 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
permit output values to fold back upon overflow.
CE
Address
0x85
0x86
0x87
0x88
0x8A
0x8B
0x8C
0x8D
Name
WSUM_X
W0SUM_X
W1SUM_X
W2SUM_X
VARSUM_X
VAR0SUM_X
VAR1SUM_X
VAR2SUM_X
Table 60: CE Transfer Variables
Description
The signed sum: W0SUM_X+W1SUM_X+W2SUM_X.
The sum of Wh samples from each wattmeter element. In_8 is the
gain 1 or 8 as configured by In_SHUNT.
LSB = 9.4045*10^-13 VMAX IMAX / In_8 Wh.
The signed sum: VAR0SUM_X+VAR1SUM_X+VAR2SUM_X.
The sum of VARh samples from each wattmeter element. In_8 is the
gain 1 or 8 as configured by In_SHUNT.
LSB = 9.4045*10^-13 VMAX IMAX / In_8 VARh.
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Rev 2