MCIMX31 Motorola Semiconductor Products, MCIMX31 Datasheet - Page 18

• Manufacturer Part Number: MCIMX31
• Manufacturer: Motorola Semiconductor Products

Electrical Characteristics
4.2
Any i.MX31 board design must comply with the power-up and power-down sequence guidelines as
described in this section to guarantee reliable operation of the device. Any deviation from these sequences
may result in any or all of the following situations:
4.2.1
The Power On Reset (POR) pin must be kept asserted (low) throughout the power up sequence. Power up
logic must guarantee that all power sources reach their target values prior to the release (de-assertion) of
POR.
power-up sequence for silicon Revision 2.0.
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Figure 2
Cause excessive current during power up phase
Prevent the device from booting
Cause irreversible damage to the i.MX31 (worst-case scenario)
Supply Power-Up/Power-Down Requirements and Restrictions
Powering Up
shows the power-up sequence for silicon Revisions 1.2 and previous.
MCIMX31/MCIMX31L Advance Information, Rev. 3.2
Preliminary—Subject to Change Without Notice
Freescale Semiconductor
Figure 3
shows the