參數(shù)資料
型號(hào)： MC68HC705V8FN
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC68
封裝： PLASTIC, LCC-68
文件頁數(shù)： 141/172頁
文件大小： 890K
代理商： MC68HC705V8FN
SECTION 7: POWER SUPPLY AND REGULATION
MOTOROLA
Page 59
MC68HC705V8 Specification Rev. 2.1
7.5
POWER SUPPLY CONFIGURATION
The recommended decoupling and interconnection of the various power supply pins is shown in
Figure 7-6. Note that this diagram does not reflect actual pin location or order.
Figure 7-6:
MC68HC705V8 On-chip Power Supply Configuration
7.5.1
DECOUPLING RECOMMENDATIONS
To provide effective decoupling and to reduce radiated RF emissions, the small decoupling
capacitors must be located as close to the supply pins as possible. The self-inductance of these
capacitors and the parasitic inductance and capacitance of the interconnecting traces determines
the self-resonant frequency of the decoupling network. Too low a frequency will reduce
decoupling effectiveness and could increase radiated RF emissions from the system. A low value
capacitor (470 pF to 0.01 uF) placed in parallel with the other capacitors will improve the
Primary
Internal (digital)
VBATT
VDD
VSS
VDD
0.1uF
10 uF
VSSA1
VSSA2
VCCA
A/D Converter
MDLC Analog
0.1uF
Single Point
Ground
>= Min VBATT
VIGN
5v regulator
VIGN
Logic
ENABLE
Secondary
Regulator
VIGN Supply
EPROM
VDD and VCC
Required for
Regulator
stability
Note: The 10 uF capacitor should be placed on the VDD pin closest to the VIGN pin.
Ignition
VBATT
C*
R*
* RC values should be chosen to provide a VIGN voltage of <= 0.4*VBATT once VBATT
reaches minimum level.
VSS
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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