IMX28CEC datasheet(14/70 Pages) FREESCALE

14 / 70 page

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

Freescale Semiconductor

Table 10 provides the recommended analog operating conditions.

Table 11 shows the PSWITCH input characteristics. See the reference schematics for the recommended

PSWITCH button circuitry.

Table 12 shows the power consumption.

2 Maximum Ambient Operating Temperature may be limited due to on-chip power dissipation. T

A (MAX) ≤ TJ - (ΘJA x PD) where:

TJ = Maximum Junction Temperature

JA = Package Thermal Resistance. See Section 3.2, “Thermal Characteristics.”

PD = Total On-chip Power Dissipation =PVDD4P2 + PBatteryCharger + PDCDC + PLinearRegulators + PInternal. Depending

on the application, some of these power dissipation terms may not apply.

PVDD4P2 = VDD4P2 On-Chip Power Dissipation = (VDD5V - VDD4P2) x IDD4P2

PBatteryCharger = Battery Charger On-Chip Power Dissipation = (VDD5V - BATT) x ICHARGE

PDCDC = DC-DC Converter On-Chip Power Dissipation = (BATT x DCDC Input Current) x (1 - efficiency)

PLinearRegulators = Linear Regulator On-Chip Power Dissipation = (VDD5V - VDDIO) x (IDDIO + IDDA + IDDD + IDD1P5) +

(VDDIO - VDDA) x (IDDA + IDDD) + (VDDA - VDDD) x IDDD + (VDDA - VDD1P5) x IDD1P5

PInternal = Internal Digital On-Chip Power Dissipation = ~VDDD x IDDD

Table 10. Recommended Analog Operating Conditions

Parameter

Min

Typ

Max

Units

Low Resolution ADC Input Impedance (CH0 - CH5)

—

Table 11. PSWITCH Input Characteristics

Parameter

HW_PWR_STS_PSWITCH

Min

Max

Units

PSWITCH LOW LEVEL

0x00

0.00

0.30

PSWITCH MID LEVEL & STARTUP1

1 A MID LEVEL PSWITCH state can be generated by connecting the VDDXTAL output of the SOC to PSWITCH through a

switch.

0x01

0.65

1.50

PSWITCH HIGH LEVEL2

2 PSWITCH acts like a high impedance input (>300 k

Ω) when the voltage applied to it is less than 1.5V. However, above 1.5V

it becomes lower impedance. To simplify design, it is recommended that a 10 k

Ω resistor to VDDIO be applied to PSWITCH

to set the HIGH LEVEL state (the PSWITCH input can tolerate voltages greater than 2.45 V as long as there is a 10 k

Ω resistor

in series to limit the current).

0x11

(1.1 * VDDXTAL) +

0.58

2.45

Table 12. Power Consumption

Parameter

Min

Typ

Max

Units

Power Consumption: Conditions - TBD

—

TBD

—

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