71M6521DE Datasheet, PDF (85/101 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521DE/71M6521FE
Energy Meter IC
DATASHEET
JANUARY 2008
CE Calibration Parameters
The table below lists the parameters that are typically entered to effect calibration of meter accuracy.
CE
Address
0x08
0x09
0x0A
0x0B
Name
CAL_IA
CAL_VA
CAL_IB
CAL_VB
0x0C
PHADJ_A
0x0D
PHADJ_B
Default
16384
16384
16384
16384
0
0
Description
These constants control the gain of their respective channels. The nominal
value for each parameters is 2¹⁴ = 16384. The gain of each channel is directly
proportional to its CAL parameter. Thus, if the gain of a channel is 1% slow,
CAL should be scaled by 1/(1 – 0.01).
These two constants control the CT phase compensation. No compensation
occurs when PHADJ_X = 0. As PHADJ_X is increased, more compensation
(lag) is introduced. Range: ±2¹⁵ – 1. If it is desired to delay the current by the
angle Φ:
PHADJ _ X = 2^{20 0.02229 ⋅TANΦ}
at 60Hz
0.1487 − 0.0131⋅TANΦ
PHADJ _ X = 2 ²⁰
0.0155 ⋅TANΦ
at 50Hz
0.1241 − 0.009695 ⋅TANΦ
Other CE Parameters
The table below shows CE parameters used for suppression of noise due to scaling and truncation effects.
CE
Address
0x13
Name
QUANTA
0x18
QUANTB
0x15
QUANT_VARA
0x1B
QUANT_VARB
0x16
QUANT_I
Default
0
0
0
0
0
Description
This parameter is added to the Watt calculation for element 0 to compensate
for input noise and truncation.
LSB = (VMAX*IMAX / In_8) *7.4162*10^-10 W
This parameter is added to the Watt calculation for element 1 to compensate
for input noise and truncation. Same LSB as QUANTA.
This parameter is added to the VAR calculation for element A to compensate
for input noise and truncation.
LSB = (VMAX*IMAX / In_8) * 7.4162*10^-10 W
This parameter is added to the VAR calculation for element B to compensate
for input noise and truncation. Same LSB as for QUANT_VARA.
This parameter is added to compensate for input noise and truncation in the
squaring calculations for I². QUANT_I affects only I0SQSUM and I1SQSUM.
LSB = (IMAX²/In_8²)*7.4162*10^-10 A²
v1.0
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