MAC7100 datasheet(8/48 Pages) MOTOROLA

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MAC7100 Microcontroller Family Hardware Specifications

MOTOROLA

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

Electrical Characteristics

3.6

Power Supply

The MAC7100 Family utilizes several pins to supply power to the oscillator, PLL, digital core, I/O ports

and ATD. In the context of this section, 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. VDD is used for VDD2.5, and VDDPLL, VSS is used for VSS2.5 and VSSPLL. IDD is used for the

sum of the currents flowing into VDD2.5 and VDDPLL.

3.6.1

Current Injection

The power supply must maintain regulation within the VDD5 or VDD2.5 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).

3.6.2

Power Supply Pins

The VDDR – VSSR pair supplies the internal voltage regulator. The VDDA – VSSA pair supplies the A/D

converter and the reference circuit of the internal voltage regulator. The VDDX – VSSX pair supplies the I/O

pins. VDDPLL – VSSPLL pair supplies the oscillator and PLL.

All VDDX pins are internally connected by metal. All VSSX pins are internally connected by metal. All

VSS2.5 pins are internally connected by metal. VDDA, VDDX and VDDR as well as VSSA, VSSX and VSSR

are connected by anti-parallel diodes for ESD protection.

3.6.3

Supply Currents

All current measurements are without output loads. Unless otherwise noted the currents are measured in

single chip mode, internal voltage regulator enabled and at 40MHz bus frequency using a 4MHz oscillator

in low power mode. Production testing is performed using a square wave signal at the EXTAL input.

In expanded modes, the currents flowing in the system are highly dependent on the load at the address, data

and control signals as well as on the duty cycle of those signals. No generally applicable numbers can be

given. A good estimate is to take the single chip currents and add the currents due to the external loads.

Table 11. Power Dissipation 1/8 Simulation Model Packaging Parameters

Component

Conductivity

Mold Compound

0.9 W/m K

Leadframe (Copper)

263 W/m K

Die Attach

1.7 W/m K

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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