SC101161DT datasheet(89/142 Pages) FREESCALE

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Device User Guide — 9S12DT128DGV2/D V02.15

Freescale Semiconductor

Section 21 Port Integration Module (PIM) Block Description

Consult the PIM_9DTB128 Block User Guide for information about the Port Integration Module.

Section 22 Voltage Regulator (VREG) Block Description

Consult the VREG Block User Guide for information about the dual output linear voltage regulator.

Section 23 Printed Circuit Board Layout Proposal

The PCB must be carefully laid out to ensure proper operation of the voltage regulator as well as of the

MCU itself. The following rules must be observed:

•

Every supply pair must be decoupled by a ceramic capacitor connected as near as possible to the

corresponding pins (C1 – C6).

•

Central point of the ground star should be the VSSR pin.

Table 23-1 Suggested External Component Values

Component

Purpose

Type

Value

VDD1 ﬁlter cap

ceramic X7R

100 … 220nF

VDD2 ﬁlter cap

ceramic X7R

100 … 220nF

VDDA ﬁlter cap

ceramic X7R

100nF

VDDR ﬁlter cap

X7R/tantalum

>= 100nF

VDDPLL ﬁlter cap

ceramic X7R

100nF

VDDX ﬁlter cap

X7R/tantalum

>= 100nF

OSC load cap

C9 / CS

PLL loop ﬁlter cap

See PLL speciﬁcation chapter

C10 / CP

PLL loop ﬁlter cap

C11 / CDC

DC cutoff cap

Colpitts mode only, if recommended by

quartz manufacturer

R1 / R

PLL loop ﬁlter res

See PLL Speciﬁcation chapter

R2 / RB

Pierce mode only

R3 / RS

Quartz

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