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| 型号： | CRD5463PM-Z |
| 厂商： | Cirrus Logic Inc |
| 文件页数： | 19/46页 |
| 文件大小： | 0K |
| 描述： | REFERENCE DESIGN FOR POWER METER |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | CS5463 |
| 主要属性： | 单相功率表 |
| 次要属性： | 90 ~ 260 VAC |
| 已供物品： | 模块，适配器，线缆，电源线 |
| 其它名称： | 598-1943 |
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CS5463
Output p in 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
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
E1
E2
E3
Above PFMON Threshold
Below PFMON Threshold
must be specified in the Voltage Sag Level Register
(VSAG Level ), and a voltage sag duration must be spec-
ified in the Voltage Sag Duration Register (VSAG Dura-
tion ). To activate current fault detection, a current sag
FREQ P ? VREFIN
VIN ? VGAIN ? IIN ? IGAIN ? PF
100 ? 2.5
0.132 ? 10 ? 0.1125 ? 10
Figure 8. PFMON output to pin 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 P . (See Section 5.1 An-
alog Inputs on page 16.) To prevent over-driving the
channel inputs, the maximum rated rms input levels will
register 0.6 in V RMS and I RMS by design. Therefore the
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:
2
PulseRate = ---------------------------------------------------------------------------------------------
Therefore with PF = 1 and:
VIN = 220V ? ? ? 150mV ? ? ? 250V ? ? = 132mV
IIN = 15A ? ? ? 150mV ? ? ? 20A ? ? = 112.5mV
the pulse rate is:
2
PulseRate = ----------------------------------------------------------------- = 420.8754Hz
and the PulseRateE Register is set to:
level must be specified in the Current Fault Level Reg-
ister (ISAG Level ), and a current sag duration must be
specified in the Current Fault Duration Register (ISAG-
Duration ). The voltage and current sag levels are speci-
fied as the average of the absolute instantaneous
voltage and current, respectively. Voltage and current
sag duration is specified in terms of ADC cycles.
Level
Duration
Figure 9. Sag and Fault Detect
5.7 No Load Threshold
The No Load Threshold register (Load Min ) is used to
disable the active energy pulse output when the magni-
tude of the P Active register is less than the value in the
Load Min register.
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-
----------------------------------------
PulseRateE =
PulseRate
? MCLK ? K ? ? 2048
=
0.2104377
tinuous conversions and stored in the Temperature
Register . The Temperature Register (T) default is Cel-
with MCLK = 4.096 MHz and K = 1.
DS678F3
sius scale (°C). The Temperature Gain Register (T gain )
and Temperature Offset Register (T off ) are constant val-
ues allowing for temperature scale conversions.
19
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