SC667201MMG3 datasheet(65/120 Pages) FREESCALE

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MPC5642A Microcontroller Data Sheet, Rev. 3.1

Freescale Semiconductor

Electrical characteristics

3.6.1

Regulator example

In designs where the MPC5642A microcontroller’s internal regulators are used, a ballast is required for generation of the 1.2 V

internal supply. No ballast is required when an external 1.2 V supply is used.

Figure 8. Core voltage regulator controller external components preferred configuration

8 The 3.3V POR specs are also valid for the V

DDEH POR

Table 16. MPC5642A External network specification

External Network

Parameter

Min

Typ

Max

Comment

—

NJD2873 or BCP68

only

1.1

F2.2F2.97F

X7R,-50%/+35%

3*2.35

F+5F3*4.7F+10F3*6.35F+13.5F

X7R, -50%/+35%

Equivalent ESR of

Ce capacitors

—

50m

—

4*50nF

4*100nF

4*135nF

X7R, -50%/+35%

+/-10%

MCU

The bypass transistor

MUST be operated out

of saturation region.

Mandatory decoupling

capacitor network

VDDREG

VRCCTL

VDD

VSS

VRCCTL capacitor and resistor is required

Creg

The resistor may or may not be

required. This depends on the

allowable power dissipation of

the npn bypass transistor

device. The resistor may be

used to limit the in-rush current

at power on.

Keep parasitic inductance

under 20nH



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