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| 型号： | MCP3905RD-PM1 |
| 厂商： | Microchip Technology |
| 文件页数： | 19/30页 |
| 文件大小： | 0K |
| 描述： | REFERENCE DESIGN FOR MCP3905 |
| 产品培训模块： | MCP3901 Analog Front End |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电度表/功率表 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MCP3905/6 |
| 主要属性： | 1 相 220 VAC 壳体封装，带机械计数器 |
| 次要属性： | 板载无变压器 AC/DC 5V 电源 |
| 已供物品： | 参考设计，文档 |
| 产品目录页面： | 677 (CN2011-ZH PDF) |
| 相关产品： | MCP3905L-I/SS-ND - IC POWER METERING-1 PHASE 24SSOP MCP3905LT-I/SSTR-ND - IC POWER METERING-1 PHASE 24SSOP MCP3906AT-I/SS-ND - IC POWER METERING-1 PHASE 24SSOP MCP3905AT-I/SS-ND - IC POWER METERING-1 PHASE 24SSOP MCP3906A-I/SS-ND - IC POWER METERING-1 PHASE 24SSOP MCP3905A-I/SS-ND - IC POWER METERING-1 PHASE 24SSOP |
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MCP3905/06
4.7
F OUT0/1 and HF OUT Output
Frequencies
For a given DC input V, the DC and RMS values are
equivalent. For a given AC input signal with peak-to-
peak amplitude of V, the equivalent RMS value is V/
The thresholds for the accumulated energy are
different for F OUT0/1 and HF OUT (i.e., they have differ-
ent transfer functions). The F OUT0/1 allowed output
frequencies are quite low in order to allow superior
can be calculated with the following equation:
sqrt(2), assuming purely sinusoidal signals. Note that
since the active (real) power is the product of two RMS
inputs, the output frequencies of an AC signal is half
that of the DC equivalent signal, again assuming purely
sinusoidal AC signals. The constant F C depends on the
F OUT0 and F OUT1 digital settings. Table 4-3 shows
F OUT0/1 output frequencies for the different logic
settings.
EQUATION 4-1:
F OUT FREQUENCY
8.06 × V 0 × V 1 × G × F
OUTPUT EQUATION
2 C
F OUT ( Hz ) = -----------------------------------------------------------
( V REF )
Where:
V 0 = the RMS differential voltage on Channel 0
V 1 = the RMS differential voltage on Channel 1
G = the PGA gain on Channel 0
(current channel)
F C = the frequency constant selected
V REF = the voltage reference
TABLE 4-3:
OUTPUT FREQUENCY CONSTANT FC FOR FOUT0/1 (V REF = 2.4V)
MCLK/2
MCLK/2
F1
0
0
1
1
F0
0
1
0
1
F C (Hz)
MCLK/2 21
MCLK/2 20
19
18
F C (Hz)
(MCLK = 3.58 MHz)
1.71
3.41
6.83
13.66
F OUT Frequency (Hz)
with Full-Scale
DC Inputs
0.74
1.48
2.96
5.93
F OUT Frequency (Hz)
with Full-Scale
AC Inputs
0.37
0.74
1.48
2.96
? 2009 Microchip Technology Inc.
DS21948E-page 19
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