CDB5463U Cirrus Logic Inc, CDB5463U Datasheet - Page 19

• Manufacturer Part Number: CDB5463U
• Description: BOARD EVAL & SOFTWARE CS5463 ADC
• Manufacturer: Cirrus Logic Inc
• Type: A/Dr

Specifications of CDB5463U

• Main Purpose: Power Management, Energy/Power Meter
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: CS5463
• Primary Attributes: 1-Phase, Energy-to-Frequency Output
• Secondary Attributes: GUI, USB, SPI Interfaces
• Product: Data Conversion Development Tools
• Maximum Clock Frequency: 4 MHz
• Interface Type: USB
• Supply Voltage (max): 5 V
• Supply Voltage (min): 3.3 V
• For Use With/related Products: CS5463
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1553

Output pin E3 is high when the line voltage is positive
and pin E3 is low when the line voltage is negative.
5.5.5 PFMON Output Mode
Setting bit E3MODE[1:0] = 1 (01b) in the Operational
Mode Register outputs the state of the PFMON compar-
ator on pin E3. Figure 8 illustrates the output format with
PFMON on E3
When PFMON is greater then the threshold, pin E3 is
high and when PFMON is less than the threshold pin E3
is low.
5.5.6 Design Example
EXAMPLE #1:
The maximum rated levels for a power line meter are
250 V rms and 20 A rms. The required number of puls-
es-per-second on E1 is 100 pulses per second
(100 Hz), when the levels on the power line are
220 V rms and 15 A rms.
With a 10x gain on the voltage and current channel the
maximum input signal is 250 mV
alog Inputs
channel inputs, the maximum rated rms input levels will
register 0.6 in V
voltage level at the channel inputs will be 150 mV rms
when the maximum rated levels on the power lines are
250 V rms and 20 A rms.
Solving for PulseRate using the transfer function:
Therefore with PF = 1 and:
the pulse rate is:
and the PulseRateE Register is set to:
with MCLK = 4.096 MHz and K = 1.
DS678F2
E1
E2
E3
PulseRate
PulseRateE
PulseRate
Figure 8. PFMON output to pin E3
Above PFMON Threshold
VIN
IIN
on page 16.) To prevent over-driving the
=
=
RMS
220V
15A
=
---------------------------------------------------------------- -
0.132
=
=
×
-------------------------------------------------------------------------------------------- -
VIN
--------------------------------------- -
(
×
and I
(
MCLK K
(
(
150mV
(
×
PulseRate
150mV
100
×
10
VGAIN
FREQ P
RMS
×
×
⁄
0.1125
2.5
)
)
)
⁄
(
⁄
⁄
20A
2
(
by design. Therefore the
2048
×
250V
×
IIN
P
×
VREFIN
)
. (See Section 5.1
)
10
Below PFMON Threshold
×
)
=
=
)
IGAIN
=
=
112.5mV
0.2104377
420.8754Hz
132mV
2
×
PF
An-
5.6 Sag and Fault Detect Feature
Status bit VSAG and IFAULT in the Status Register, in-
dicates a sag occurred in the power line voltage and
current, respectively. For a sag condition to be identi-
fied, the absolute value of the instantaneous voltage or
current must be less than the sag level for more than
half of the sag duration (see Figure 9).
To activate voltage sag detection, a voltage sag level
must be specified in the Voltage Sag Level Register
(VSAG
ified in the Voltage Sag Duration Register (VSAG
tion
level must be specified in the Current Fault Level Reg-
ister (ISAG
specified in the Current Fault Duration Register (ISAG-
Duration
fied as the average of the absolute instantaneous
voltage and current, respectively. Voltage and current
sag duration is specified in terms of ADC cycles.
5.7 No Load Threshold
The No Load Threshold register (Load
disable the active energy pulse output when the magni-
tude of the P
Load
5.8 On-chip Temperature Sensor
The on-chip temperature sensor is designed to assist in
characterizing the measurement element over a desired
temperature range. Once a temperature characteriza-
tion is performed, the temperature sensor can then be
utilized to assist in compensating for temperature drift.
Temperature measurements are performed during con-
tinuous conversions and stored in the Temperature
Register . The Temperature Register (T) default is Cel-
sius scale (°C). The Temperature Gain Register (T
and Temperature Offset Register (T
ues allowing for temperature scale conversions.
). To activate current fault detection, a current sag
Min
). The voltage and current sag levels are speci-
Level
register.
Figure 9. Sag and Fault Detect
), and a voltage sag duration must be spec-
Level
Active
), and a current sag duration must be
register is less than the value in the
Duration
off
) are constant val-
Min
Level
CS5463
) is used to
Dura-
gain
19
)