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CS5467
6. SETTING UP THE CS5467
6.1 Clock Divider
The internal clock to the CS5467 needs to operate
around 4 MHz. However, by using the internal clock di-
vider, a higher crystal frequency can be used. This is im-
path within a channel, a phase matching filter (PMF) is
applied to the other path within that channel. The PMF
filter matches the amplitude and phase response of the
HPF in the band of interest, but passes DC.
portant when driving an external microcontroller
requiring a faster clock and using the CPUCLK output.
K is the divide ratio from the crystal input to the internal
clock and is selected with Configuration register ( Con-
fig ) bits K[3:0]. It has a range of 1 to 16. A value of zero
results in a setting of 16.
VHPF
0
0
1
1
IHPF
0
1
0
1
Filter Configuration
No filter on Voltage or Current
HPF on Current, PMF on Voltage
HPF on Voltage, PMF on Current
HPF on Current and Voltage
6.2 CPU Clock Inversion
By default, CPUCLK is inverted from XIN. Setting Con-
figuration register bit iCPU removes this inversion. This
can be useful when one phase adds more noise to the
system than the other.
6.3 Interrupt Pin Behavior
The behavior of the INT pin is controlled by the IMODE
and IINV bits in the Configuration register as shown.
Table 3. High-pass Filter Configuration
6.6 Cycle Count
Low-rate calculations, such as average power and RMS
voltage and current integrate over several ( N ) output
word rate (OWR) samples. The duration of this averag-
ing window is set by the Cycle Count ( N ) register. By de-
fault, Cycle Count is set to 4000 (1 second at output
word rate [OWR] of 4000 Hz). The minimum value for
Cycle Count is 10.
IMODE
0
0
1
IINV
0
1
0
INT Pin
Active-low Level
Active-high Level
Low Pulse
6.7 Energy Pulse Outputs
By default, E1 outputs total active energy, E3, total re-
active energy, and E2, the sign of both active and reac-
tive energy. (See Figure 2. Timing Diagram for E1, E2,
and E3 on page 13.)
Three pairs of bits in the Mode Control ( Modes ) register
control the operation of these outputs. These bits are
1
1
High Pulse
named E1MODE[1:0], E2MODE[1:0], and
E3MODE[1:0]. Some combinations of these bits over-
Table 1. Interrupt Configuration
If IMODE = 1, the duration of the INT pulse will be two
DCLK cycles, where DCLK = MCLK/K.
6.4 Current Input Gain Ranges
Control register bits I1gain (I2gain) select the input
ride others, so read the following paragraphs carefully.
The E2 pin can output energy sign, or total apparent en-
ergy. Table 4 lists the functions of E2 as controlled by
E2MODE[1:0] in the Modes register .
Note: E2MODE[1:0]=3 is a special mode.
range of the current inputs.
E2MODE1 E2MODE0
E2 output
I1gain, I2gain
0
1
Maximum Input
±250 mV
±50 mV
Gain
10x
50x
0
0
1
0
1
0
Energy Sign
Total Apparent Energy
Not Used
Table 2. Current Input Gain Ranges
1
1
Enable E1MODE
6.5 High-pass Filters
Mode Control ( Modes ) register bits VHPF and IHPF ac-
tivate the HPF in the voltage and current paths, respec-
tively. Each energy channel has separate VHPF and
IHPF bits. When a high-pass filter is enabled in only one
20
Table 4. E2 Pin Configuration
The E3 pin can output total reactive energy, power fail
monitor status, voltage1 sign, or total apparent energy.
Table 5 lists the functions of E3 as controlled by
DS714F3
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