Cirrus Logic CS5490 - Manual (Page 34)

CS5490
34 DS982F3
6.6.3 Configuration 2 (Config2) – Page 16, Address 0
Default = 0x10 0200
[23] Reserved.
POS Positive energy only. Suppress negative values in P
AVG
. If a negative value is calculated,
a zero result will be stored.
0 = Positive and negative energy (Default)
1 = Positive energy only
[21:15] Reserved.
APCM Selects the apparent power calculation method.
0 = V
RMS
x I
RMS
(Default)
1 = SQRT(P
AVG
2
+ Q
AVG
2
)
[13] Reserved.
ZX_LPF Enable LPF in zero-cross detect.
0 = LPF disabled (Default)
1 = LPF enabled
AVG_MODE Select averaging mode for low-rate calculations.
0 = Use SampleCount (Default)
1 = Use CycleCount
REG_CSUM_OFF Disable checksum on critical registers.
0 = Enable checksum on critical registers (Default)
1 = Disable checksum on critical registers
AFC Enables automatic line frequency measurement which sets Epsilon every time a new line
frequency measurement completes. Epsilon is used to control the gain of 90° phase shift
integrator used in quadrature power calculations.
0 = Disable automatic line frequency measurement
1 = Enable automatic line frequency measurement (Default)
[8:5] Reserved.
IFLT[1:0] Filter enable for current channel.
00 = No filter (Default)
01 = High-pass filter (HPF) on current channel
10 = Phase-matching filter (PMF) on current channel
11 = Rogowski coil integrator (INT) on current channel
VFLT[1:0] Filter enable for voltage channel.
00 = No filter (Default)
01 = High-pass filter (HPF) on voltage channel
10 = Phase-matching filter (PMF) on voltage channel
11 = Reserved
IIR_OFF[0] Bypass IIR filter.
0 = Do not bypass IIR filter (Default)
1 = Bypass IIR filter
23 22 21 20 19 18 17 16
- POS - 1 - 0 0 -
15 14 13 12 11 10 9 8
- APCM - ZX_LPF AVG_MODE REG_CSUM_OFF AFC 0
7 6 5 4 3 2 1 0
0 0 0 IFLT[1] IFLT[0] VFLT[1] VFLT[0] IIR_OFF