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PCF8575CDB 数据表(PDF) 21 Page - Texas Instruments |
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PCF8575CDB 数据表(HTML) 21 Page - Texas Instruments |
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21 / 38 page  V CC V POR V PORF Time POR Time V CC Time V CC_GH V CC_GW PCF8575C www.ti.com SCPS123F – MARCH 2005 – REVISED JANUARY 2015 Glitches in the power supply can also affect the power-on reset performance of this device. The glitch width (VCC_GW) and height (VCC_GH) are dependent on each other. The bypass capacitance, source impedance, and device impedance are factors that affect power-on reset performance. Figure 22 and Table 1 provide more information on how to measure these specifications. Figure 22. Glitch Width and Glitch Height VPOR is critical to the power-on reset. VPOR is the voltage level at which the reset condition is released and all the registers and the I2C/SMBus state machine are initialized to their default states. The value of VPOR differs based on the VCC being lowered to or from 0. Figure 23 and Table 1 provide more details on this specification. Figure 23. VPOR Copyright © 2005–2015, Texas Instruments Incorporated Submit Documentation Feedback 21 Product Folder Links: PCF8575C |
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