MAC7200 datasheet(944/976 Pages) FREESCALE

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Power Supply

MAC7200 Microcontroller Family Reference Manual, Rev. 2

866

Freescale Semiconductor

A.6

Power Supply

The MAC7200 family utilizes several pins to supply power to the oscillator, PLL, digital core, I/O ports

and ATD. In the context of this section, the following conventions apply:

•VDD5 is used for VDDA, VDDR or VDDX; VSS5 is used for VSSA, VSSR or VSSX unless otherwise

noted. IDD5 denotes the sum of the currents flowing into the VDDA, VDDX, and VDDR.

•VDD33 is used for VDD3.3, and VDDPLL, VSS3 is used for VSS3.3 and VSSPLL. IDD33 is used for

the sum of the currents flowing into VDD3.3 and VDDPLL.

•VDD is used for VDD1.5, VSS is used for VSS1.5. IDD is used for the current flowing into VDD1.5.

A.6.1

Current Injection

The power supply must maintain regulation within the VDD5, VDD33 or VDD operating range during

instantaneous and operating maximum current conditions. If positive injection current (Vin > VDD5) is

greater than IDD5, the injection current may flow out of VDD5 and could result in the external power supply

going out of regulation. It is important to ensure that the external VDD5 load will shunt current greater than

the maximum injection current. The greatest risk will be when the MCU is consuming very little power

(for example, if no system clock is present, or if the clock rate is very low).

A.6.2

Power Supply Pins

The device has the following power supply pins.

•

The VDDR – VSSR pair supplies the internal voltage regulator.

•

The VDDA – VSSA pair supplies the ATD converter and the reference circuit of the internal voltage

regulator.

•

The VDDX – VSSX pairs supply the I/O pins. The following VDDX and VSSX pins are internally

connected by metal

—VDDX3, VDDX5, VDDX8, VDDX9

—VDDX1, VDDX2, VDDX4, VDDX6, VDDX7, VDDX10, VDDX11

—VSSX3, VSSX5, VSSX8, VSSX9

—VSSX1, VSSX2, VSSX4, VSSX6, VSSX7, VSSX10, VSSX11

•

The VDDPLL – VSSPLL pair supplies the oscillator and PLL.

•

The VDD3.3 – VSS3.3 pair supplies the pre-drivers for the I/O pins and the on-chip Flash.

•

The VDD1.5 – VSS1.5 pairs supply the core logic. All VDD1.5 pins are internally connected by

metal. All VSS1.5 pins are internally connected by metal.

VDDA, VDDX and VDDR as well as VSSA, VSSX and VSSR are connected by ESD protection diodes.

Table A-10. Power Dissipation 1/8 Simulation Model Packaging Parameters

Component

Conductivity

Mold Compound

0.96 W/m K

Die Attach

1.5 W/m K

MAC7200 Datasheet(PDF) 944 Page - Freescale Semiconductor, Inc

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