参数资料
型号: MC68HC05V7CB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP56
封装: SDIP-56
文件页数: 135/170页
文件大小: 980K
代理商: MC68HC05V7CB
SECTION 7: POWER SUPPLY AND REGULATION
MOTOROLA
Page 53
MC68HC05V7 Specification Rev. 1.0
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:
MC68HC05V7 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 bandwidth and effectiveness of the network.
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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