参数资料
型号: MC68HC05V12CFNR2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68
封装: PLASTIC, LCC-68
文件页数: 64/135页
文件大小: 2080K
代理商: MC68HC05V12CFNR2
NON-DISCLOSURE
AGREEMENT
REQUIRED
General Description
Technical Data
MC68HC05V12 Rev. 2.0
28
General Description
MOTOROLA
1.6.1 VDD and VSSD
These pins provide power to all the microcontroller’s digital circuits. The
short rise and fall times of the MCU supply current transients place very
high short-duration current demands on the internal power supply. To
prevent noise problems, special care should be taken to provide good
power supply bypassing at the MCU by using bypass capacitors with
good high-frequency characteristics that are positioned as close to the
MCU supply pins as possible. Two sets of VDD and VSS pins are required
to maintain on-chip supply noise within acceptable limits. Each supply
pin pair will require its own decoupling capacitor. These are high-current
pins.
1.6.2 VSSA
VSSA is a separate ground pad which provides a ground return for the
analog-to-digital (A/D) subsystem and the digital-to-analog (D/A) gauge
subsystem. To prevent digital noise contamination, this pin should be
connected directly to a low-impedance ground reference point.
1.6.3 VCCA
VCCA is a separate supply pin providing power to the analog subsystems
of the A/D converter and gauge drivers. This pin must be connected to
the VDD pin externally. To prevent contamination from the digital supply,
this pin should be adequately decoupled to a low-impedance ground
reference.
1.6.4 VREFH and VREFL
VREFH is the positive (high) reference voltage for the A/D subsystem.
VREFL is the negative (low) reference voltage for the A/D subsystem.
VREFH and VREFL should be isolated from the digital supplies to prevent
any loss of accuracy from the A/D converter.
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