71m6521fe Maxim Integrated Products, Inc., 71m6521fe Datasheet - Page 85

• Manufacturer Part Number: 71m6521fe
• Description: Energy Meter Ic
• Manufacturer: Maxim Integrated Products, Inc.

The table below lists the parameters that are typically entered to effect calibration of meter accuracy.
The table below shows CE parameters used for suppression of noise due to scaling and truncation effects.
v1.0
Address
Address
0x0A
0x0B
0x0C
0x0D
0x1B
0x08
0x09
0x13
0x18
0x15
0x16
CE
CE
QUANT_VARA
QUANT_VARB
PHADJ_A
PHADJ_B
CAL_VA
CAL_VB
QUANT_I
CAL_IA
CAL_IB
QUANTA
QUANTB
Name
Name
Default
16384
16384
16384
16384
Default
0
0
0
0
0
0
0
© 2005-2008 TERIDIAN Semiconductor Corporation
Description
These constants control the gain of their respective channels. The nominal
value for each parameters is 2
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: ±2
angle Φ:
PHADJ
PHADJ
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
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
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 I
LSB = (IMAX
CE Calibration Parameters
Other CE Parameters
_
_
X
X
=
=
2
/In_8
2
2
20
20
. 0
. 0
2
)*7.4162*10
1241
1487
71M6521DE/71M6521FE
. 0
. 0
02229
−
0155
2
−
. QUANT_I affects only I0SQSUM and I1SQSUM.
. 0
. 0
009695
15
14
0131
⋅
⋅
TAN
-10
– 1. If it is desired to delay the current by the
= 16384. The gain of each channel is directly
TAN
A
⋅
2
Φ
⋅
TAN
TAN
Φ
-10
-10
Energy Meter IC
Φ
W
Φ
W
at 60Hz
at 50Hz
DATASHEET
JANUARY 2008
Page: 85 of 101