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SPEAR320-2 bảng dữ liệu(PDF) 49 Page - STMicroelectronics

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SPEAR320-2 bảng dữ liệu(HTML) 49 Page - STMicroelectronics

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SPEAr320
Electrical characteristics
Doc ID 16755 Rev 5
49/73
6.8
Removing power supplies for power saving
It is recommended to remove the the power supplies in the order shown in Figure 5. So VDD
3.3
supply is to be removed first, then the VDD 2.5 supply, followed by the VDD 1.8 supply and
last the VDD 1.2. The minimum time (Δt) between each power down is >0 µs.
Figure 5.
Power-down sequence
6.9
Power on reset (MRESET)
The MRESET must remain active for at least 10 ms after all the power supplies are in the
correct range and should become active in no more than 10 µs when one of the power
supplies goes out of the correct range.
Power-down sequence
VDD 1.2
VDD1.8
VDD 2.5
VDD 3.3
t
t
t



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