MAC7200 datasheet(486/976 Pages) FREESCALE

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External Signal Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

408

Freescale Semiconductor

22.2.2

Detailed Signal Descriptions

Check device level specification for connectivity of the signals.

22.2.2.1

VDDR - Regulator Power Input

Signal VDDR is the power input of VREG_HIP7A. All currents sourced into the regulator loads flow

through this pin. A chip external decoupling capacitor (100nF...220nF, X7R ceramic) between VDDR and

VSS can smooth ripple on VDDR.

For entering Shutdown Mode pin VDDR should also be tied to ground on devices without VREGEN pin.

22.2.2.2

VDDA, VSSA - Regulator Reference Supply

Signals VDDA/VSSA which are supposed to be relatively quiet are used to supply the analog parts of the

regulator. Internal precision reference circuits are supplied from these signals. A chip external decoupling

capacitor (100nF...220nF, X7R ceramic) between VDDA and VSSA can further improve the quality of this

supply.

22.2.2.3

VDD15, VSS15 - Regulator Output1 (Core Logic)

Signals VDD15/VSS15 are the primary outputs of VREG_HIP7A that provide the power supply for the

core logic. These signals are connected to device pins to allow external decoupling capacitors

(100nF...220nF, X7R ceramic).

In Shutdown Mode an external supply driving VDD15/VSS15 can replace the voltage regulator.

Table 22-1. VREG_HIP7A - Signal Properties

Name

Function

Reset State

Pull up

VDDR

VREG_HIP7A power input (positive supply)

—

VDDA

VREG_HIP7A quiet input (positive supply)

—

VSSA

VREG_HIP7A quiet input (ground)

—

VDD15

VREG_HIP7A primary 1.5V output (positive supply)

—

VSS15

VREG_HIP7A primary 1.5V output (ground)

—

VDD33

VREG_HIP7A primary 3.3V output (positive supply)

—

VSS33

VREG_HIP7A primary 3.3V output (ground)

—

VDDPLL

VREG_HIP7A secondary 3.3V output (positive supply)

—

VSSPLL

VREG_HIP7A secondary 3.3V output (ground)

—

VREGEN

(optional)

VREG_HIP7A (Optional) Regulator Enable

—

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