Datasheet
71M6511/71M6511H
Single-Phase Energy Meter IC
DATA SHEET
NOVEMBER 2010
Page: 73 of 98 © 2005–2010 Teridian Semiconductor Corporation V2.7
A Maxim Integrated Products Brand
S
F
F
TF
0
0
=
Current Shunt Variables
Input variables: IA_SHUNT and IB_SHUNT can configure the current inputs to accept shunt resistor sensors. In this case the
CE provides an additional gain of 8 to the current inputs. This will enable the pulse rate to change by 8 times. In order to
maintain a normal pulse rate WRATE may have to be decreased by 8 times. Whenever IA_SHUNT or IB_SHUNT are set to 1 or
a positive number, In_8 is assigned a value of 8 in the equation for Kh.
CE
Address
Name Default Description
2A IA_SHUNT -1
When +1, these variables increase the respective current gain by 8. The
gain factor controlled by In_SHUNT is referred to as In_8 throughout this
document. Allowed values are 1 or –1. For example, if IB_SHUNT=-1, IB_8
= 1, if IB_SHUNT = 1, IB_8 = 8.
IA_SHUNT corresponds to IA_8, IB_SHUNT corresponds to IB_8.
2B IB_SHUNT -1
2C RESERVED
CE Calibration Parameters
The table below lists the parameters that are typically entered to affect calibration of meter accuracy.
CE
Address
Name Default Description
8 CAL_IA 16384
These constants control the gain of their respective channels. The nominal
value for each parameters is 2
14
= 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).
9 CAL_VA 16384
A CAL_IB 16384
B RESERVED
C RESERVED
D RESERVED
E PHADJ_A 0
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
15
– 1. If it is desired to delay the current by the
angle Φ:
Φ⋅−
Φ⋅
=
TANcb
TANa
XPHADJ
20
2_
)2cos()21(2)21(1
0
929
TFa
π
−−
−−−+=
)2sin()21(
0
9
TFb
π
−
−=
)2cos()21(1
0
9
TFc
π
−
−−=
F
0
10
0