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| 型号： | MCP3905L-E/SS |
| 厂商： | Microchip Technology |
| 文件页数： | 19/32页 |
| 文件大小： | 0K |
| 描述： | IC ENERGY METERING 24SSOP |
| 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 ~ 125°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 |
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MCP3905A/05L/06A
The high-frequency output HF OUT
has lower
4.7.1
MINIMAL OUTPUT FREQUENCY
HF OUT ( Hz ) = ----------------------------------------------------------------
( V REF )
integration times and, thus, higher frequencies. The
output frequency value can be calculated with the
following equation:
EQUATION 4-2: HF OUT FREQUENCY
OUTPUT EQUATION
8.06 × V 0 × V 1 × G × HF C
2
Where:
V 0 is the RMS differential voltage on channel 0
V 1 is the RMS differential voltage on channel 1
G is the PGA gain on channel 0 (current channel)
HF C is the frequency constant selected
V REF is the voltage reference
The constant HF C depends on the F OUT0 and F OUT1
digital settings with the Table 4-4 .
The detailed timings of the output pulses are described
in the Timing Characteristics table (see Section 1.0
“Electrical Characteristics” and Figure 1-1 ).
FOR
NO-LOAD THRESHOLD
The MCP3905A/05L/06A devices also include, on
each output frequency, a no-load threshold circuit that
will eliminate any creep effects in the meter. The
outputs will not show any pulse if the output frequency
falls below the no-load threshold. The minimum output
frequency on F OUT0/1 and HF OUT is equal to 0.0015%
of the maximum output frequency (respectively F C and
HF C ) for each of the F2, F1 and F0 selections (see
Table 4-3 and Table 4-4 ); except when F2, F1,
F0 = 011 . In this last configuration, the no-load
threshold feature is disabled. The selection of F C will
determine the start-up current load. In order to respect
the IEC standards requirements, the meter will have to
be designed to allow start-up currents compatible with
the standards by choosing the FC value matching
these requirements. For additional applications
information on no-load threshold, startup current and
other meter design points, refer to AN994, "IEC
Compliant Active Energy Meter Design Using The
MCP3905/6 ”, (DS00994).
TABLE 4-3:
MCP3905L OUTPUT FREQUENCY SETTINGS
F2
0
0
0
0
1
1
1
1
F1
0
0
1
1
0
0
1
1
F0
0
1
0
1
0
1
0
1
HF C
64X F C
32X F C
16X F C
2048X F C
8X F C
64X F C
32X F C
16X F C
HF C (Hz)
MCLK/2 15
MCLK/2 15
MCLK/2 15
MCLK/2 7
MCLK/2 16
MCLK/2 16
MCLK/2 16
MCLK/2 16
HF C (Hz),
MCLK=3.58 MHz
109.25
109.25
109.25
27968.75
54.62
54.62
54.62
54.62
HF OUT (Hz),
w/ full scale
AC inputs
23.71
23.71
23.71
6070.12
11.85
11.85
11.85
11.85
F C (Hz)
MCLK/2 21
MCLK/2 20
MCLK/2 19
MCLK/2 18
MCLK/2 19
MCLK/2 22
MCLK/2 21
MCLK/2 20
F C (Hz),
MCLK=3.58 MHz
1.71
3.41
6.83
13.66
6.83
0.85
1.71
3.41
TABLE 4-4:
MCP3905A/06A OUTPUT FREQUENCY SETTINGS
F2
0
0
0
0
1
1
F1
0
0
1
1
0
0
F0
0
1
0
1
0
1
HF C
64X F C
32X F C
16X F C
2048X F C
128X F C
64X F C
HF C (Hz)
MCLK/2 15
MCLK/2 15
MCLK/2 15
MCLK/2 7
MCLK/2 14
MCLK/2 14
HF C (Hz),
MCLK=3.58 MHz
109.25
109.25
109.25
27968.75
219.51
219.51
HF OUT (Hz),
w/ full scale
AC inputs
23.71
23.71
23.71
6070.12
47.42
47.42
F C (Hz)
MCLK/2 21
MCLK/2 20
MCLK/2 19
MCLK/2 18
MCLK/2 21
MCLK/2 20
F C (Hz),
MCLK=3.58 MHz
1.71
3.41
6.83
13.66
1.71
3.41
1
1
0
32X F C
MCLK/2
14
219.51
47.42
MCLK/2
19
6.83
1
1
1
16X F C
MCLK/2 14
219.51
47.42
MCLK/2 18
13.66
? 2006-2011 Microchip Technology Inc.
DS22011B-page 19
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