IMX28AEC datasheet(18/72 Pages) FREESCALE

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i.MX28 Applications Processors Data Sheet for Automotive Products, Rev. 1

Freescale Semiconductor

3.1.6

Supply Power-Up/Power-Down Requirements

There is no special power-up sequence. After applying 5 V or battery in any order, the rest of the power

supplies are internally generated and automatically come up in a safe way.

There is no special power-down sequence. 5 V or the battery can be removed at any time.

3.1.7

Reset Timing

Because the i.MX28 is a PMU and an SoC, power-on reset is generated internally and there is no timing

requirement on external pins.

The i.MX28 can be reset by asserting the external pin RESETN for at least 100 mS and later deasserting

RESETN.

If the reset occurs while the device is only powered by the battery, then the reset kills all of the power

supplies and the system reboots on the assertion of PSWITCH. If auto-restart is set up ahead of time, the

system reboots immediately.

If the chip is powered by 5 V, then the reset serves to reset the digital sections of the chip. If the DCDC is

operating at the time of the reset, then power switches back to the default linear regulators powered by 5 V.

Figure 2. RESETN Timing

3.2

Thermal Characteristics

The thermal resistance characteristics for the device are given in Table 22. These values are measured

under the following conditions:

•

Two layer Substrate

•

Substrate solder mask thickness: 0.025 mm

•

Substrate metal thicknesses: 0.016 mm

•

Substrate core thickness: 0.160 mm

OSC32K

DCDC

Off

RTC

Other Modules

Off

On/Off

Table 21. Power Mode Settings (continued)

Core/Clock/Module

Deep-Sleep

Standby

Run

RESETN

At least 100ms

IMX28AEC Datasheet(PDF) 18 Page - Freescale Semiconductor, Inc

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