71M6511 Maxim, 71M6511 Datasheet - Page 69

• Manufacturer Part Number: 71M6511
• Description: The 71M6511 and 71M6511H are highly integrated SoCs with an MPU core, RTC, flash, and LCD driver
• Manufacturer: Maxim

Instantaneous Power Measurement Variables
The FREQSEL Register selects the input phase used for frequency measurement and for the MAIN_EDGE counter. The
frequency measurement is implemented using the frequency locked loop of the CE for the selected phase.
IxSQSUM_X and VxSQSUM are the squared current and voltage samples acquired during the last accumulation interval.
INSQSUM_X can be used for computing the neutral current.
The RMS values can be computed by the MPU from the squared current and voltage samples as per the formulae:
Note: FS = 2520.6Hz (MUX_DIV = 1) or 3276.8Hz (MUX_DIV = 2)
Other Measurement Parameters
MAINEDGE_X is useful for implementing a real-time clock based on the input AC signal. MAINEDGE_X is the number of half-
cycles accounted for in the last accumulated interval for the AC signal of the phase specified in the FREQSEL register.
Page: 69 of 98
Address
Ix
Address
RMS
CE
4C
4D
CE
33
41
4A
4B
4E
4F
50
52
53
55
A Maxim Integrated Products Brand
=
IxSQSUM
MAINEDGE_X
RESERVED
RESERVED
Name
N
⋅
LSB
RESERVED
ACC
FREQ_X
Name
⋅
3600
Description
The number of edge crossings of the selected voltage in the previous
accumulation interval. Edge crossings are either direction and are de-
bounced.
© 2005–2010 Teridian Semiconductor Corporation
⋅
RESERVED
RESERVED
V0SQSUM_X
RESERVED
RESERVED
I0SQSUM_X
I1SQSUM_X
F
S
Vx
RMS
Description
Fundamental frequency.
or
The sum of squared current samples from each element.
LSB = 6.6952*10
LSB = 5.1501*10
The sum of squared voltage samples from each element.
LSB= 6.6952*10
LSB = 5.1501*10
LSB
=
2
F
32
S
VxSQSUM
≡
≈
2
F
32
. 0
S
Single-Phase Energy Meter IC
763
≈
. 0
-13
587
⋅
-13
-13
-13
10
N
VMAX
⋅
IMAX
IMAX
VMAX
71M6511/71M6511H
−
LSB
ACC
⋅
6
10
Hz for MUX_DIV = 2
2
2
−
2
2
⋅
DATA SHEET
6
/ In_8
/ In_8
V
V
3600
Hz for MUX_DIV = 1
2
2
h (for MUX_DIV = 1)
h (for MUX_DIV = 2)
2
2
⋅
A
A
F
2
2
h (for MUX_DIV = 1)
h (for MUX_DIV = 2)
S
NOVEMBER 2010
V2.7