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SI8440 Datasheet(PDF) 16 Page - Silicon Laboratories |
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SI8440 Datasheet(HTML) 16 Page - Silicon Laboratories |
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16 / 24 page  Si8440/1/2 16 Rev. 0.3 4. Layout Recommendations Dielectric isolation is a set of specifications produced by the safety regulatory agencies from around the world that describes the physical construction of electrical equipment that derives power from a high-voltage power system such as 100–240 VAC systems or industrial power systems. The dielectric test (or HIPOT test) given in the safety specifications places a very high voltage between the input power pins of a product and the user circuits and the user touchable surfaces of the product. For the IEC relating to products deriving their power from the 220–240 V power grids, the test voltage is 2500 VAC (or 3750 VDC—the peak equivalent voltage). There are two terms described in the safety specifications: Creepage—the distance along the insulating surface an arc may travel. Clearance—the distance through the shortest path through air that an arc may travel. Figure 14 illustrates the accepted method of providing the proper creepage distance along the surface. For a 220–240 V application, this distance is 8 mm and the wide body SOIC package must be used. There must be no copper traces within this 8 mm exclusion area, and the surface should have a conformal coating such as solder resist. The digital isolator chip must straddle this exclusion area. Figure 14. Creepage Distance 4.1. Supply Bypass The Si8440 requires a 0.1 µF bypass capacitor between VDD1 and GND1 and VDD2 and GND2. The capacitor should be placed as close as possible to the package. 4.2. Input and Output Characteristics The Si8440 inputs and outputs are standard CMOS drivers/receivers. 4.3. Enable Inputs The receiver output drivers are enabled when the Enable input is high and the drivers remain in a high- impedance state when Enable is low. The Enable input can be used for multiplexing or as a clock sync input. Supply currents remain at their nominal values when Enable is low. The Enable inputs must be tied to a logic level. |
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