参数资料
型号: MCP3905L-I/SS
厂商: Microchip Technology
文件页数: 19/30页
文件大小: 0K
描述: IC POWER METERING-1 PHASE 24SSOP
产品培训模块: MCP3901 Analog Front End
标准包装: 59
输入阻抗: 390 千欧
测量误差: 0.1%
电压 - 高输入/输出: 2.4V
电压 - 低输入/输出: 0.85V
电流 - 电源: 2.7mA
电源电压: 4.5 V ~ 5.5 V
测量仪表类型: 单相
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 24-SSOP(0.209",5.30mm 宽)
供应商设备封装: 24-SSOP
包装: 管件
产品目录页面: 677 (CN2011-ZH PDF)
配用: MCP3905RD-PM1-ND - REFERENCE DESIGN FOR MCP3905
MCP3905EV-ND - BOARD DEMO FOR MCP3905
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
integration time (see Section 4.6 “Low-Pass Filter
and DTF Converter” ). The F OUT0/1 output frequency
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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