S12SPIV2D datasheet(79/126 Pages) FREESCALE

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MC9S12DJ64 Device User Guide — V01.17

Table 22-1 Suggested External Component Values

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.

•

Use low ohmic low inductance connections between VSS1, VSS2 and VSSR.

•

VSSPLL must be directly connected to VSSR.

•

Keep traces of VSSPLL, EXTAL and XTAL as short as possible and occupied board area for C7,

C8, C11 and Q1 as small as possible.

•

Do not place other signals or supplies underneath area occupied by C7, C8, C10 and Q1 and the

connection area to the MCU.

•

Central power input should be fed in at the VDDA/VSSA pins.

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

PLL loop ﬁlter res

See PLL speciﬁcation chapter

R2 / RB

PLL loop ﬁlter res

Pierce mode only

R3 / RS

PLL loop ﬁlter res

Quartz

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