5 pulseratee, Active, 9 power offset register ( p – Cirrus Logic CS5461A User Manual
Page 28: Cs5461a, Register, 7 active (real) power registers ( p, And v, Registers ( i
CS5461A
28
DS661F3
6.5 PulseRateE
1,2
Register
Address: 6
Default = 0xFA000 = 32000.00 Hz
PulseRateE
1,2
sets the frequency of the E1 and/or E2 pulses. The smallest valid frequency is 2
-4
with 2
-5
incre-
mental steps. A pulse rate higher than (MCLK/K)/8 will result in a pulse rate setting of (MCLK/K)/8. The value
is represented in unsigned notation, with the binary point to the right of bit 5.
6.6 Instantaneous Current, Voltage and Power Registers ( I , V , P )
Address: 7 (Instantaneous Current); 8 (Instantaneous Voltage); 9 (Instantaneous Power)
I and V contain the instantaneous measured values for current and voltage, respectively. The instantaneous
voltage and current samples are multiplied to obtain Instantaneous Power (P). The value is represented in two's
complement notation and in the range of -1.0
I, V, P 1.0, with the binary point to the right of the MSB.
6.7 Active (Real) Power Registers ( P
Active
)
Address: 10
The instantaneous power is averaged over each computation cycle (N conversions) to compute Active Power
(P
Active
). The value is represented in two's complement notation and in the range of -1.0
P
Active
1.0, with the
binary point to the right of the MSB.
6.8 I
RMS
and V
RMS
Registers ( I
RMS
, V
RMS
)
Address: 11 (I
RMS
); 12 (V
RMS
)
I
RMS
and V
RMS
contain the Root Mean Square (RMS) value of I and V, calculated over each computation cycle.
The value is represented in unsigned binary notation and in the range of 0.0
I
RMS
, V
RMS
1.0, with the binary
point to the left of the MSB.
6.9 Power Offset Register ( P
off
)
Address: 14
Default = 0x000000
Power Offset (P
off
) is added to the instantaneous power being accumulated in the P
active
register and can be
used to offset contributions to the energy result that are caused by undesirable sources of energy that are in-
herent in the system. The value is represented in two's complement notation and in the range of -1.0
P
off
1.0,
with the binary point to the right of the MSB.
MSB
LSB
2
18
2
17
2
16
2
15
2
14
2
13
2
12
2
11
.....
2
1
2
0
2
-1
2
-2
2
-3
2
-4
2
-5
MSB
LSB
-(2
0
)
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
.....
2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
MSB
LSB
-(2
0
)
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
.....
2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
MSB
LSB
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
2
-8
.....
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23
2
-24
MSB
LSB
-(2
0
)
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
.....
2
-17
2
-18
2
-19
2
-20
2
-21
2
-22
2
-23