71M6515H
A Maxim Integrated Products Brand
Energy Meter IC
DATA SHEET
JULY 2011
At high pulse rates, duty cycle is 50%. At rates less than 1/(2*PWmax), the negative going pulse width is PWmax. The
allowed range is 0 to 231-1.
The pulse width for the PULSE3 and PULSE4 outputs is always at a 50% duty cycle.
The initial voltage level of the pulse pins is defined with the PULSE_INIT pin.
Value in Pulse
Source Register
Name
Description
(hex) (dec)
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0
1
2
3
4
5
6
7
8
WSUM
WASUM
WBSUM
The signed sum: W0SUM + W1SUM + W2SUM
The sum of Wh samples from individual wattmeter elements.
LSB = 9.4045*10-13 VMAX IMAX / In_8 Wh
WCSUM
VARSUM
VARASUM
VARBSUM
VARCSUM
VASUM
VAASUM
VABSUM
VACSUM
The signed sum: VAR0SUM + VAR1SUM + VAR2SUM
The sum of VARh samples from individual wattmeter elements.
LSB = 9.4045*10-13 VMAX IMAX / In_8 VARh
The sum of VAh samples from individual samples.
9
10
11
The sum of VAh samples from individual wattmeter elements.
LSB = 9.4045*10-13 VMAX IMAX / In_8 VAh
The sum of the square of the calculated neutral current.
(I + I + I )2.
0x0C
12
INSQSUM
∑
0
1
2
LSB = 9.4045*10-13 IMAX2 / In_82 A2h
0x0D
0x0E
0x0F
13
14
15
IASQSUM
IBSQSUM
ICSQSUM
The sum of squared current samples from each element.
LSB = 9.4045*10-13 IMAX2 / In_82 A2h
Table 6: Pulse Sources Defined by the PULSE_SRCS Register (1/2)
Page: 34 of 60
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