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STPMC1 数据表(PDF) 15 Page - STMicroelectronics |
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STPMC1 数据表(HTML) 15 Page - STMicroelectronics |
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15 / 77 page  STPMC1 Terminology Doc ID 15728 Rev 6 15/77 7 Terminology 7.1 Measurement error The error associated with the energy measured by the STPMC1 is defined as: 7.2 Conventions The lowest analog and digital power supply voltage is called VSS which represents the system ground (GND). All voltage specifications for digital input/output pins are referred to GND. Positive currents flow into a pin. “Sinking current” is the current flowing into the pin, and so it is positive. “Sourcing current” is the current flowing out of the pin, and so it is negative. Signal timing specifications treated by a digital control part are relative to XTAL1. This signal is provided from the crystal oscillator or from an external source as specified in paragraph 9.4. Signal timing specifications of the SPI interface are relative to the SCLNLC. There is no direct relationship between the clock (SCLNLC) of the SPI interface and the clock of the DSP block (XTAL1). A positive logic convention is used in all equations. Energy True Energy True ) reading ( 1 SPMC Error Percentage − = |
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