71M6521DE TERIDIAN [Teridian Semiconductor Corporation], 71M6521DE Datasheet - Page 82

• Manufacturer Part Number: 71M6521DE
• Description: Energy Meter IC
• Manufacturer: TERIDIAN [Teridian Semiconductor Corporation]

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:
The table below 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 1 second. Additionally, the hardware will not permit output values to ‘fold back’ upon overflow.
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CECONFIG
[15:8]
[bit]
[7]
[6]
[5]
[4]
[3]
[2]
[1]
[0]
1.
2.
3.
4.
5.
6.
Fundamental energy measurement variables
Instantaneous (RMS) values
Other measurement parameters
Pulse generation variables
Current shunt variables
Calibration parameters
PULSE_SLOW
PULSE_FAST
EXT_PULSE
IB_SHUNT
IA_SHUNT
SAG_CNT
FREQSEL
Name
--
--
Default
© 2005-2008 TERIDIAN Semiconductor Corporation
(0x50)
Fundamental Energy Measurement Variables
80
0
0
0
1
0
0
0
0
Unused
Unused
Description
Number of consecutive voltage samples below SAG_THR before a sag
alarm is declared. The maximum value is 255. SAG_THR is at address
0x14.
Selected phase for frequency monitor (0 = A, 1 = B).
When zero, causes the pulse generators to respond to WSUM_X and
VARSUM_X. Otherwise, the generators respond to values the MPU places
in APULSEW and APULSER.
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_SLOW = 1, the pulse generator input is reduced by a factor of
64. When PULSE_FAST = 1, the pulse generator input is increased 16x.
These two parameters control the pulse gain factor X (see table below).
Allowed values are either 1 or 0. Default is 0 (X = 6).
1.5 * 2
1.5 * 2
1.5 * 2
-4
1.5
= 0.09375
X
6
2
= 96
= 6
71M6521DE/71M6521FE
PULSE_SLOW
0
0
1
1
Energy Meter IC
PULSE_FAST
DATASHEET
0
1
0
1
JANUARY 2008
v1.0