MCIMX253DVM4 Freescale, MCIMX253DVM4 Datasheet - Page 16
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MCIMX253DVM4
Manufacturer Part Number
MCIMX253DVM4
Description
Manufacturer
Freescale
Datasheet
1.MCIMX253DVM4.pdf
(154 pages)
Specifications of MCIMX253DVM4
Operating Temperature (min)
-20C
Operating Temperature (max)
70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MCIMX253DVM4
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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3.2
Any i.MX25 board design must comply with the power-up and power-down sequence guidelines given in
this section to ensure reliable operation of the device. Recommended power-up and power-down
sequences are given in the following subsections.
3.2.1
The following power-up sequence is recommended:
16
1. Assert power on reset (POR).
2. Turn on digital logic domain and I/O power supplies VDDn and NVCCx.
3. Turn on all other analog power supplies, including USBPHY1_VDDA_BIAS,
4. Negate the POR signal.
USBPHY1_UPLL_VDD, USBPHY1_VDDA, USBPHY2_VDD, OSC24M_VDD,
MPPLL_VDD, UPLL_VDD, NVCC_ADC, and FUSEVDD (FUSEVDD is tied to GND if fuses
are not being programmed). The minimum time between turning on each power supply is the time
it takes for the previous supply to be stable.
Supply Power-Up/Power-Down Requirements and Restrictions
Power-Up Sequence
Deviations from the guidelines in this section may result in the following
situations:
•
•
•
For security applications, the coin battery must be connected during both
power-up and power-down sequences to ensure that security keys are not
unintentionally erased.
•
•
•
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 7
Excessive current during power-up phase
Prevention of the device from booting
Irreversible damage to the i.MX25 (worst-case scenario)
The user is advised to connect FUSEVDD to GND except when fuses
are being programmed, in order to prevent unintentional blowing of
fuses.
Other power-up sequences may be possible; however, the above
sequence has been verified and is recommended.
There is a 1-ms minimum time between supplies coming up, and a 1-ms
minimum time between POR_B assert and deassert.
CAUTION
NOTE
NOTE
Freescale Semiconductor
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