IMX28AEC datasheet(10/72 Pages) FREESCALE

10 / 72 page

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

Freescale Semiconductor

2.1

Special Signal Considerations

Special signal considerations are listed in Table 5. The package contact assignment is found in Section 4,

“Package Information and Contact Assignments.” Signal descriptions are provided in the reference

manual.

Table 5. Signal Considerations

Signal

Descriptions

PSWITCH

The pin is used for chip power on or recovery. VDDIO can be applied to PSWITCH through a

10 k

Ω resistor. This is necessary in order to enter the chip’s firmware recovery. The on-chip

circuitry prevents the actual voltage on the pin from exceeding acceptable levels.

VDDXTAL

This pin is an output of i.MX28. Should be coupled to ground with a 0.1 uF capacitor. User

should not supply external power to this pin.

BATTERY

This pin should be connected to the battery with minimal resistance. It provides charging current

to the battery.

See the “Power Supply” section of the reference manual for details.

DCDC_BATTERY

This pin is an input of i.MX28 that provides supply to the DCDC converter. It should be

connected to the battery with minimal resistance. See the “Power Supply” section of the

reference manual for details.

XTALI

XTALO

These analog pins are connected to an external 24 MHz crystal circuit. This crystal provides the

clock source for on-chip PLLs.

RTC_XTALO

RTC_XTALI

These analog pins are connected to an external 32.768/32.0 kHz crystal circuit. This crystal

provides clock source to the on-chip real-time counter circuits.

RESETN

This pin resets the chip if it is low. This pin is pulled up to VDDIO33 with an internal 10 kohm

resistor. No external pull up resistors are needed.

DEBUG

This pin is used for JTAG interface.

DEBUG=0: JTAG interface works for boundary scan.

DEBUG=1: JTAG interface works for ARM debugging.

TESTMODE

For Freescale factory use only. Must be externally connected to GND for normal operation.

IMX28AEC Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc

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