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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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MCP3910 Datenblatt(PDF) 59 Page - Microchip Technology |
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MCP3910 Datenblatt(HTML) 59 Page - Microchip Technology |
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59 / 90 page  2012-2020 Microchip Technology Inc. DS20005116D-page 59 MCP3910 8.0 BASIC APPLICATION CONFIGURATION 8.1 Typical Isolated Power Metering Applications One of the main applications for MCP3910 is energy/power measurements in systems where the ADC needs to be isolated from the rest of the design. Figure 8-1 can be used as a starting point for MCP3910 applications. This is typically the case in a polyphase shunt-based power/energy metering or monitoring appli- cation. In this case, each phase needs to be isolated from the rest of the design, and since the sensor is not providing this isolation, the isolation needs to be provided at the output of the analog front end. The MCP3910 device is built to work seamlessly with a large variety of 2-channel unidirectional digital isolators (optocouplers, capacitive or inductive integrated digital isolators with or without embedded power supplies). The isolator used between the MCU and ADC needs to be fast enough to support the high-speed clock between the MCU and ADC, and the data coming from the ADC to MCU. Data from the ADC to MCU have the same speed as the clock supplied by the MCU. Since the ADC is isolated from the MCU, it can be placed at any potential area and so shunts can be used as current sensors in three-phase meter designs, even if they do not provide any galvanic isolation. To power the isolated ADC, an isolated DC/DC Converter (that can be embedded with the isolated data communication channels, as in Figure 8-1) or other structures that provide isolated power supplies (e.g., flyback converter) can be used. For single-phase designs where isolation between the ADC and MCU is not required, the SPI connection is also available. This SPI interface could also be used with isolators, but this would require four isolators instead of two (for the Two-Wire mode), and therefore, this configuration is not preferred. FIGURE 8-1: MCP3910 Three-Phase Shunt Energy Meter – Typical Application Schematic for Each Phase. 3910A_SDO A_GNDD A_GNDA A_GNDA A_GNDA 10 R76 0.1uF C52 10 R100 0.1uF C43 10 R86 0.1uF C9 A_GNDA A_GNDA A_GNDA 0.1uF C46 A_3.3D A_3.3A 1k R25 A_GNDD DR / GAIN1 14 DGND 11 AGND 8 CH0- 5 DVDD 2 OSC1/CLKI 15 SCK / MCLK 18 MDAT1 12 MDAT0 13 CH1- 6 CH1+ 7 RFIN/OUT+ 9 RFIN- 10 RESET / OSR0 1 AVDD 3 CH0+ 4 CS / BOOST 17 OSC2 / MODE 16 SDO 19 SDI / OSR1 20 DR / GAIN1 DGND AGND CH0- DVDD OSC1/CLKI SCK / MCLK MDAT1 MDAT0 CH1- CH1+ RFIN/OUT+ RFIN- RESET / OSR0 AVDD CH0+ CS / BOOST OSC2 / MODE SDO SDI / OSR1 MCP3910 U3 MCP3910A1T/ISS 1 2 3 J24 1 2 3 J25 A_3.3D 1k R80 A_GNDD 1 2 3 J26 1 2 3 J27 1 2 3 J28 HIGH LOW HIGH LOW LOW LOW HIGH HIGH GAIN1 GAIN0 BOOST OSR1 OSR0 HIGH LOW 1k R79 3910A_CLKIN 10 R87 3910A_SDO A_GNDD A_3.3D 3910A_CLKIN 3910_CLKIN_MCU_A PHASE A A_3.3D A_3.3D A_3.3A A_GNDA VBT1-S5-S5 -Vin 1 +Vin 2 +Vout 5 -Vout 4 -Vin +Vin +Vout -Vout DC DC U7 4.7uF C63 MCP1754-3.3V VIN 3 VOUT 2 VIN VOUT U18 A_GNDD 0.1uF C57 4.7uF C22 5V L2 GND 3.3D GND 0.1uF 0603 C68 3.3D GND 0.1uF 0603 C60 A_3.3D A_GNDD NT3 3910A_SDO_MCU/RC3 VDD1 1 VOA 2 VIB 3 GND1 4 VDD2 8 VIA 7 VOB 6 GND2 5 VDD1 VOA VIB GND1 VDD2V V VIA VOB GND2G G FOD8012 U21 A_GNDA A_GNDA A_GNDA 330k R8 A_GNDA A_GNDA 0.1uF C5 1k R5 1k R4 330k R9 0.1uF C1 HIGH LINE_SHUNT1 LINE_SHUNT2 Via_1.6x1 CP1 Via_1.6x1 CP2 DNP R3 DNP R6 FB2 FB3 FB1 |
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