Motorola MC9S12DJ128B, MC9S12DT128B, MC9S12DB128B manual Printed Circuit Board Layout Proposal

Models: MC9S12DT128B

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Section 22 Printed Circuit Board Layout Proposal

MC9S12DT128B Device User Guide — V01.07

Section 22 Printed Circuit Board Layout Proposal

Table 22-1 Suggested External Component Values

Component

Purpose

Type

Value

 

 

 

 

C1

VDD1 filter cap

ceramic X7R

100 … 220nF

 

 

 

 

C2

VDD2 filter cap

ceramic X7R

100 … 220nF

 

 

 

 

C3

VDDA filter cap

ceramic X7R

100nF

 

 

 

 

C4

VDDR filter cap

X7R/tantalum

>= 100nF

 

 

 

 

C5

VDDPLL filter cap

ceramic X7R

100nF

 

 

 

 

C6

VDDX filter cap

X7R/tantalum

>= 100nF

 

 

 

 

C7

OSC load cap

 

 

 

 

 

 

C8

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

 

 

 

 

 

 

 

 

Q1

Quartz

 

 

 

 

 

 

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.

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Page 78
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Motorola MC9S12DJ128B, MC9S12DT128B manual Printed Circuit Board Layout Proposal, 1 Suggested External Component Values