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SI8030CA-B-IU Arkusz danych(PDF) 9 Page - Silicon Laboratories |
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SI8030CA-B-IU Arkusz danych(HTML) 9 Page - Silicon Laboratories |
9 / 23 page Si80xx Rev. 1.0 9 3. Device Operation Device behavior during start-up, normal operation, and shutdown is shown in Figure 5, where UVLO+ and UVLO- are the positive-going and negative-going thresholds respectively. Refer to Table 5 to determine outputs when power supply (VDD) is not present. Additionally, refer to Table 6 for logic conditions when enable pins are used. Table 5. Si80xx Logic Operation VI Input1,2 EN Input1,2,3,4 VDDI State1,5,6 VDDO State1,5,6 VO Output1,2 Comments H H or NC P P H Enabled, normal operation. LH or NC P P L X7 L P P Hi-Z8 Disabled. X7 H or NC UP P L9 H9 Upon transition of VDDI from unpowered to pow- ered, VO returns to the same state as VI after Start- up Time, tSU X7 L UP P Hi-Z8 Disabled. X7 X7 P UP Undetermined Upon transition of VDDO from unpowered to pow- ered, VO returns to the same state as VI after Start- up Time, tSU, if EN is in either the H or NC state. Upon transition of VDDO from unpowered to pow- ered, VO returns to Hi-Z after Start-up Time, tSU, if EN is L. Notes: 1. VDDI and VDDO are the input and output power supplies. VI and VO are the respective input and output terminals. EN is the enable control input located on the same output side. 2. X = not applicable; H = Logic High; L = Logic Low; Hi-Z = High Impedance. 3. It is recommended that the enable inputs be connected to an external logic high or low level when the Si80xx is operating in noisy environments. 4. No Connects are not internally connected and can be left floating, tied to VDD, or tied to GND. 5. “Powered” state (P) is defined as 3.15 V < VDD < 5.5 V. 6. “Unpowered” state (UP) is defined as VDD = 0 V. 7. Note that an I/O can power the die for a given side through an internal diode if its source has adequate current. 8. When using the enable pin (EN) function, the output pin state is driven into a high-impedance state when the EN pin is disabled (EN = 0). 9. See "9. Ordering Guide" on page 18 for details. This is the selectable fail-safe operating mode (ordering option). Some devices have default output 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. |
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