Datasheet

MAX71020
Single-Chip Electricity Meter AFE
32Maxim Integrated
Table 17. CE Parameters for Noise Suppression and Code Version
Table 18. CE Calibration Parameters
CE
ADDRESS
NAME DEFAULT DESCRIPTION
0x25 QUANT_VA 0
Compensation factors for truncation and noise in voltage, current, real energy, and
reactive energy for phase A.
0x26 QUANT_IA 0
0x27 QUANT_A 0
0x28 QUANT_VARA 0
0x29 QUANT_VB 0
Compensation factors for truncation and noise in voltage, current, real energy, and
reactive energy for phase B.
0x2A QUANT_IB 0
0x2B QUANT_B 0
0x2C QUANT_VARB 0
-13 2 2
MAX
QUANT_Ix_LSB 3.28866 10 I (Amps )= ××
-10
MAX MAX
QUANT_Wx_LSB 6.73518 10 V I (Watts)= ×××
-10
MAX MAX
QUANT_VARx_LSB 6.73518 10 V I (Vars)= ×××
CE
ADDRESS
NAME DEFAULT DESCRIPTION
0x10 CAL_IA 16384
These constants control the gain of their respective channels. The nominal
value for each parameter 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 increased by 1%.
0x11 CAL_VA 16384
0x13 CAL_IB 16384
0x14 CAL_VB 16384
0x12 PHADJ_A 0
These constants control the CT phase compensation. Compensation does not
occur when PHADJ_X = 0. As PHADJ_X is increased, more compensation (lag)
is introduced. The range is ±215 – 1. If it is desired to delay the current by the
angle F, the equations are:
20
0.02229 TAN
PHADJ_X 2
0.1487 - 0.0131 TAN
×F
=
×F
at 60Hz
20
0.0155 TAN
PHADJ_X 2
0.1241- 0.009695 TAN
×F
=
×F
at 50Hz
0x15 PHADJ_B 0