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ADE7912 データシート(PDF) 24 Page - Analog Devices |
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ADE7912 データシート(HTML) 24 Page - Analog Devices |
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24 / 41 page  ADE7912/ADE7913 Data Sheet Rev. C | Page 24 of 41 CS_A CS_B CS_C SCLK MOSI MISO CLK I/O MICROCONTROLLER ISOLATION BARRIER PHASE A ADE7912/ADE7913 PHASE B ADE7912/ADE7913 PHASE C ADE7912/ADE7913 IP IM V1P VM V2P GNDMCU GNDISO_A XTAL2 XTAL1 SCLK MOSI MISO CS IP IM V1P VM V2P GNDMCU GNDISO_B XTAL2 XTAL1 SCLK MOSI MISO CS IP IM V1P VM V2P GNDMCU GNDISO_C XTAL2 XTAL1 SCLK MOSI MISO CS LOAD CLKOUT/ DREADY CLKOUT/ DREADY CLKOUT/ DREADY Figure 35. Microcontroller Generating Clock to Three ADE7912/ADE7913 Devices In Figure 35, the CLKOUT/DREADY pin of the ADE7912/ ADE7913 that senses the Phase C current and voltage is connected to the I/O pin of the microcontroller. CLKOUT/ DREADY provides an active low pulse for 64 CLKIN cycles (15.625 µs at CLKIN = 4.096 MHz) when the ADC conversion data is available. It signals when the ADC outputs of all ADE7912/ ADE7913 devices become available and when the microcontroller starts to read them. See the Synchronizing Multiple ADE7912/ADE7913 Devices section for more information about synchronizing multiple ADE7912/ADE7913 devices. At power-up, or after a hardware or software reset, follow the procedure described in the Power-Up Procedure for Systems with Multiple Devices That Use a Single Crystal section or the Power-Up Procedure for Systems with Multiple Devices That Use Clock Generated from Microcontroller section to ensure that the ADE7912/ADE7913 devices function appropriately. The configuration of an energy meter using four ADE7912/ ADE7913 devices is similar, shown in Figure 36. The micro- controller uses an additional I/O pin, CS_N, to generate the SPI CS signal to the ADE7912/ADE7913 device that is monitoring the neutral current. CS_A CS_B CS_C CS_N SCLK MOSI MISO I/O MICROCONTROLLER ISOLATION BARRIER PHASE A ADE7912/ADE7913 PHASE B ADE7912/ADE7913 PHASE N ADE7912/ADE7913 IP IM V1P VM V2P GNDMCU GNDISO_A XTAL2 XTAL1 SCLK MOSI MISO CS IP IM V1P VM V2P GNDMCU GNDISO_B XTAL2 XTAL1 SCLK MOSI MISO CS IP IM V1P VM V2P GNDMCU GNDISO_N XTAL2 XTAL1 SCLK MOSI MISO CS LOAD EARTH PHASE C ADE7912/ADE7913 IP IM V1P VM V2P GNDMCU GNDISO_C XTAL2 XTAL1 SCLK MOSI MISO CS 4.096MHz CRYSTAL CLKOUT/ DREADY CLKOUT/ DREADY CLKOUT/ DREADY CLKOUT/ DREADY Figure 36. 3-Phase Energy Meter Using Four ADE7912/ADE7913 Devices |
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