IAR-KSK-IMX25 Freescale Semiconductor, IAR-KSK-IMX25 Datasheet - Page 17

• Manufacturer Part Number: IAR-KSK-IMX25
• Description: KIT DEVELOPMENT I.MX257, ARM926
• Manufacturer: Freescale Semiconductor
• Series: i.MX25r
• Type: MCUr

Specifications of IAR-KSK-IMX25

• Contents: Board, Cables, CD, Debugger, Power Supply
• Processor To Be Evaluated: I.MX257
• Processor Series: i.MX25
• Data Bus Width: 16 bit
• Interface Type: UART, JTAG, USB, Ethernet, SD/MMC
• Core: ARM926EJ-S
• Silicon Manufacturer: Freescale
• Core Architecture: ARM
• Core Sub-architecture: ARM9
• Silicon Core Number: I.MX2
• Silicon Family Name: I.MX25
• Mcu Supported Families: I.MX25
• For Use With/related Products: i.MX25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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; in addition to having the proper capacitor placed on the NVCC_DRYICE output pin, 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
NVCC_CRM reaches 90 % of 3.3 V. Step 2 and step 4 order are critical for proper power-loss
protection.
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. 8
Figure 2. Power-Up Sequence Diagram
NOTE
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