MCIMX253CJM4A Freescale, MCIMX253CJM4A Datasheet - Page 17
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MCIMX253CJM4A
Manufacturer Part Number
MCIMX253CJM4A
Description
Manufacturer
Freescale
Datasheet
1.MCIMX253CJM4A.pdf
(142 pages)
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Figure 2
powered up. After Core VDD and NVDDx are stable, the analog supplies can be powered up.
3.2.2
There are no special requirements for the power-down sequence. All power supplies can be shut down at
the same time.
3.2.3
In order to guarantee DryIce power-loss protection, which includes that SRTC time is kept during
power-down, users must follow the specific power-Up/Down sequence.
For users who want to utilize the DryIce power-loss protection feature, the following power-up sequence
is recommended:
Freescale Semiconductor
QVDD and NVDD
Analog Supplies
1. Assert Power on reset (POR).
2. Turn on NVCC_CRM.
3. At any time from step 2 and to step 4, turn on other digital I/O power suppliers NVCCx.
4. Turn on digital logic domain QVDD no less than 1 ms and no greater than 32 ms after
5. Turn on all other analog power supplies including USBPHY1_VDDA_BIAS,
NVCC_CRM reaches 90 % of 3.3 V. Step 2 and step 4 order are critical for proper power-loss
protection.
USBPHY1_UPLL_VDD, USBPHY1_VDDA, USBPHY2_VDD, NVCC_ADC,
OSC24M_VDD, MPPLL_VDD, UPLL_VDD and FUSEVDD no less than 1ms and no greater
than 32 ms after QVDD reaches 90% of 1.2V. FUSEVDD is tied to GND if fuses are not being
programmed.
shows the power-up sequence diagram. After POR_B is asserted, Core VDD and NVDDx can be
POR_B
Power-Down Sequence
SRTC DryIce Power-Up/Down Sequence
This is to guarantee that POR is stable already at NVCC_CRM/QVDD
power domain interface before QVDD is on, and POR instantly propagates
to QVDD domain after QVDD is on.
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 6
Figure 2. Power-Up Sequence Diagram
NOTE
17
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