71M6511/71M6511H
Single-Phase Energy Meter IC
DATA SHEET
AUGUST 2007
CE
Name
Default
Description
Address
When PULSE_SLOW > 0, the pulse generator input is reduced 64x.
When PULSE_FAST > 0, the pulse generator input is increased 16x.
These two parameters control the pulse gain factor X (see table below). Allowed
0x28
0x29
0x2D
PULSE_SLOW
1
values are either 1 or –1.
X
PULSE_SLOW
PULSE_FAST
1.5 * 22 = 6
1.5 * 26 = 96
1.5 * 2-4 = 0.09375
1.5
-1
-1
1
-1
1
-1
PULSE_FAST
WRATE
1
1 (default)
1 (default)
Kh =
VMAX*IMAX*47.1132 / (In_8*WRATE*NACC*X) Wh/pulse (for MUX_DIV = 1).
VMAX*IMAX*36.2409 / (In_8*WRATE*NACC*X) Wh/pulse (for MUX_DIV = 2).
1556
0x36
0x37
SUM_PRE
2520
15
PRE_SAMPS * SUM_CYCLES. This variable is also called NACC.
Should be 15 or 0. When zero, causes the pulse generators to respond to
WSUM_X and VARSUM_X. Otherwise, the generators respond to values the
MPU places in APULSEW and APULSER.
EXT_PULSE
The maximum pulse width (low-going pulse) is:
(2 * PULSE_WIDTH + 1) * 397µs (for MUX_DIV = 1)
(2 * PULSE_WIDTH + 1) * 305µs (for MUX_DIV = 2)
0 is a legitimate value.
0x3C
0x26
PULSE_WIDTH
APULSEW
50
0
Wh pulse generator input, to be updated by the MPU when using external pulse
generation (see DIO_PW bit). The output pulse rate is:
APULSEW * FS * 2-32 * WRATE * 2-14
This input is buffered and can be updated by the MPU during a computation in-
terval. The change will take effect at the beginning of the next interval.
VARh pulse generator input to be updated by the MPU when using external
pulse generation (see DIO_PV bit). The output pulse rate is:
APULSER * FS*2-32 * WRATE * 2-14
0x27
APULSER
0
This input is buffered and can be updated by the MPU during a computation in-
terval. The change will take effect at the beginning of the next interval.
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