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SI8621ET-IS 데이터시트(PDF) 5 Page - Silicon Laboratories |
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SI8621ET-IS 데이터시트(HTML) 5 Page - Silicon Laboratories |
5 / 38 page 3. Device Operation Device behavior during start-up, normal operation, and shutdown is shown in Figure 3.1 Device Behavior during Normal Operation on page 5, where UVLO+ and UVLO– are the respective positive-going and negative-going thresholds. Refer to the following table to determine outputs when power supply (VDD) is not present. Table 3.1. Si86xx Logic Operation VI Input1, 2 VDDI State1, 3, 4 VDDO State1, 3, 4 VO Output1, 2 Comments H P P H Normal operation. L P P L X5 UP P L6 H6 Upon transition of VDDI from unpowered to powered, VO re- turns to the same state as VI in less than 1 µs. X5 P UP Undetermined Upon transition of VDDO from unpowered to powered, VO re- turns to the same state as VI within 1 µs. Note: 1. VDDI and VDDO are the input and output power supplies. VI and VO are the respective input and output terminals. 2. X = not applicable; H = Logic High; L = Logic Low; Hi-Z = High Impedance. 3. “Powered” state (P) is defined as 2.5 V < VDD < 5.5 V. 4. “Unpowered” state (UP) is defined as VDD = 0 V. 5. Note that an I/O can power the die for a given side through an internal diode if its source has adequate current. 6. See Ordering Guide for details. This is the selectable fail-safe operating mode (ordering option). Some devices have default out- put state = H, and some have default output state = L, depending on the ordering part number (OPN). For default high devices, the data channels have pull-ups on inputs/outputs. For default low devices, the data channels have pull-downs on inputs/outputs. Si861x/2x Data Sheet Device Operation silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 4 |
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