參數(shù)資料
型號： MC68HC705V8CFU
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, PQFP64
封裝： QFP-64
文件頁數(shù)： 143/172頁
文件大?。?/td> 890K
代理商： MC68HC705V8CFU
SECTION 7: POWER SUPPLY AND REGULATION
MOTOROLA
Page 61
MC68HC705V8 Specification Rev. 2.1
the VDD and VSSD pins, ensuring the HF capacitor is closest. The two VSSD pins should
be externally connected together.
The effect of not connecting the two VDD pins together is under evaluation and it is recom-
mended that they be connected at this time.
2) VDD to VSSD (pins 3 & 4): MCU internal digital power decoupling. These pins are
connected to the on-chip regulator output via a small resistance. Decouple with a 0.1uF
ceramic or polystyrene capacitator. If the self-resonance frequency of the decoupling cir-
cuit (assume 4nH per bond wire) is too low, add a 0.01uF or smaller capacitor in parallel to
increase the bandwidth of the decoupling network. Ensure the smaller capacitor is located
closest to the VDD and VSSD pins.
3) VCCA to VSSA1 and VSSA2: Analog subsystem power supply pins. These pins are
internally isolated from the digital VDD and VSS supplies. The VSSA1 pin provides a ground
return for the A/D subsystem. The VSSA2 pin provides a ground return for the DLC sub-
system. The analog supply pins should be appropriately ltered to prevent any external
noise effecting the analog subsystems. The VSSA1 and VSSA2 pins should be brought
together with the digital ground at a single point which has a low (HF) impedance to
ground to prevent common mode noise problems. If this is not practical, then the VSSA1
and VSSA2 printed circuit board (PCB) traces should be routed in such a manner that digi-
tal ground return current is impeded from passing through the analog input ground refer-
ence as shown in the single sided PCB example below.
V
SSD
V8
V
SSA
ANx
To System GND
AIN
V
SSD
V8
V
SSA
ANx
AGND
AIN
GND
Shielded cable,
GND
Shielded cable, Twisted pair, etc.
Poor Analog Grounding
Better Analog Grounding
Twisted pair, etc.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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