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X80142Q20I Datasheet(PDF) 10 Page - Intersil Corporation |
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X80142Q20I Datasheet(HTML) 10 Page - Intersil Corporation |
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10 / 18 page  10 FN8153.0 January 20, 2005 4. Power Up of Supplies Via Relay Sequencing Using Voltage Monitors (see Figure 10 and Figure 9). 5. Several power supplies and their respective power up start times can be controlled using the X80140 such that each of the power supplies will start in a relay sequencing fashion. In the following example, the 1st supply is allowed to power up when the input regulated supply reaches an acceptable threshold. Subsequent supplies power up after the prior supply has reached its operating voltage. This configuration ensures that each subsequent power supply turns on after the preceding supplies voltage output is valid. Again, the X80140 offers programmable delays for each voltage monitor and this delay is selectable via the SMBus during calibration of the system. V3GDO V3MON V2GDO V2MON V1GDO V1MON X80140/41/42/43/44 RESET µC VCC1 FPGA VCC1 ASIC VCC1 V4GDO V4MON RESET VCC2 VCC2 VCC2 MR 1.2V 2.5V 3.3V 5V Power Supplies IRQ On/Off On/Off On/Off FIGURE 7. EXAMPLE APPLICATION OF PARALLEL POWER CONTROL V1MON tDELAY1 V1GDO Programmable Delay Timing not to scale 100ms 500ms 1 sec 5 secs V4MON tDELAY4 V4GDO Programmable Delay tSPOR Programmable Delay RESET Can Choose Different Delays for each Voltage Monitor FIGURE 8. PARALLEL POWER CONTROL - TIMING X80140, X80141, X80142, X80143, X80144 |
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