參數(shù)資料
型號: MC9S12UF32PU
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 60 MHz, MICROCONTROLLER, PQFP100
封裝: LQFP-100
文件頁數(shù): 125/128頁
文件大?。?/td> 1785K
代理商: MC9S12UF32PU
System on a Chip Guide — 9S12UF32DGV1/D V01.05
96
Freescale Semiconductor
22.2 PCB Design Recommendation
The PCB must be carefully laid out to ensure proper operations of the voltage regulator as well as 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.
Central point of the ground star should be the VSSR pin.
Use low ohmic, low inductance connections between VSSR, VSSX, VSS3X, VSSA and VSSA1.
Keep traces of VSSA, EXTAL and XTAL as short as possible and occupied board area for C7, C8
and X1 as small as possible.
Do not place other signals or supplies underneath area occupied by C7, C8 and X1, and the
connection area to the MCU.
Central power input should be fed in at the VDDR/VSSR pins.
Table 22-1 Recommended decoupling capacitor choice
Component
Purpose
Type
Value
C1
decoupling cap
X7R/tantalum
>=100nF
C2
decoupling cap
X7R/tantalum
>=100nF
C3
decoupling cap
ceramic X7R
100nF
C4
decoupling cap
ceramic X7R
100nF
C5
decoupling cap
ceramic X7R
100nF
C6
decoupling cap
choice of C6 cap depends on the
type of NMOS transistor
Q1
NMOS transistor
R1
DMF resistor
impedance matching resistors
depend on board design
R2
DPF resistor
R21
DMH resistor
R22
DMF resistor
R3
RREF resistor
See Voltage Regulator Appendix
R4
RPU resistor
C7
OSC load cap
See crystal manufacturer’s
recommendations
C8
OSC load cap
R5
OSC resistor
X1
Quartz
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