MAXQ3183-RAN+ Maxim Integrated Products, MAXQ3183-RAN+ Datasheet - Page 72

• Manufacturer Part Number: MAXQ3183-RAN+
• Description: IC AFE POLYPHASE MULTI 28TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAXQ3183-RAN+

• Number Of Channels: 8
• Power (watts): 140mW
• Voltage - Supply, Analog: 3.6V
• Voltage - Supply, Digital: 3.6V
• Package / Case: 28-TSSOP
• For Use With: MAXQ3183-KIT - KIT EV REFRNC DSIGN FOR MAXQ3183
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of Bits: -
• Other names: 90-M3183+RAN

Low-Power, Multifunction, Polyphase AFE
with Harmonics and Tamper Detect
setting this register to 0x4000. Read the A.IRMS regis-
ter (0x1CC). Note the value. Convert the known value to
meter units by multiplying the known value (in amperes)
by 2
culation by the value read from the MAXQ3183. The
result should be a value between 0 and 2. Convert the
integer by multiplying 2
result is the gain value to be programmed into
A.GAIN_LO.
Once voltage and current have been calibrated, the
energy and power calculation automatically reflects the
calibrated voltage and current. However the energy
gain factor (X.E_GAIN, X = A/B/C) can be further tuned
to achieve even more accurate power and energy
result if necessary. For example, if the voltage and cur-
rent calibration sources are not as accurate as the
power/energy calibration source, then the additional
gain calibration may be necessary. The following pro-
cedure for power/energy gain calibration is outlined for
phase A.
• Apply a precision unity power factor power (applied
• Read the PWRP.A register. Note the value.
Figure 16. Phase Offset vs. Input Current Calibration
72
value) that is close to the desired normal operating
point.
24
______________________________________________________________________________________
and dividing by I
Calibrating Power/Energy Gain
14
FS
, and ensure MSB is zero. The
. Divide the results of this cal-
2
1
0
I
2
PA2
PA1
I2THR
INPUT CURRENT
I
1
• Convert the applied value to meter units by dividing it
• Divide the applied value (in meter unit) by the value
• Multiply the calculated value by 2
• When the gain value is programmed, wait for 1 to 2
To perform the calibration at three current levels, note
the raw current value (X.IRMS) at each point. Label the
current values, from highest to lowest, I
Program X.PA0, X.PA1, and X.PA2 with the phase offset
values calculated at I
described in the Calibrating Phase Offset section.
Finally, program I1THR with the average of I
and program I2THR with the geometric average of I
and I
adjusted accordingly. See Figure 16.
I1THR
by MU_PWR.
read from the MAXQ3183. The result should be a
value between 0 and 2. If the value falls outside of
this range, I
calculated.
MSB is zero. The result is the gain value to be pro-
grammed into A.E_GAIN.
seconds, then reread the power value from PWRP.A.
Check that the measured value is correct by compar-
ing PWRP.A against the applied power in meter unit.
2
. Now as the current changes the phase offset is
I
0
FS
PA0
and/or V
Multipoint Phase Offset Calibration
0
, I
FS
1
, and I
have probably been mis-
2
14
, respectively, as
, and ensure the
0
, I
1
0
, and I
and I
2
1
1
.
,