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SPEAR1340 数据表(PDF) 148 Page - STMicroelectronics |
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SPEAR1340 数据表(HTML) 148 Page - STMicroelectronics |
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148 / 200 page  Electrical characteristics SPEAr1340 148/200 Doc ID 023063 Rev 4 4.8 Power-up sequence It is recommended to power up the power supplies in the order shown in Figure 13. VDD 1V2 is brought up first, followed by VDD 1V5/1V8, and then VDD 3V3. The minimum time ( Δt) between each power up is >0 µs. Note: The 2V5 power supply is generated by internal voltage regulators, just after the 3V3. Make sure that different 2V5 input power rails are driven by SPEAr internal regulators. Figure 13. Power-up sequence 4.9 Power-down sequence All power supplies can be shut down at the same time. VDD 1V2 VDD VDD 3V3 Power-up sequence t t t 1V5/1V8 |
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