參數(shù)資料
型號(hào): MC56F8355MFG60
廠商: MOTOROLA INC
元件分類: 數(shù)字信號(hào)處理
英文描述: 4-BIT, 120 MHz, OTHER DSP, PQFP128
封裝: LQFP-128
文件頁(yè)數(shù): 54/152頁(yè)
文件大小: 2224K
代理商: MC56F8355MFG60
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Power Distribution and I/O Ring Implementation
56F8355 Technical Data
147
Preliminary
Consider all device loads as well as parasitic capacitance due to PCB traces when calculating
capacitance. This is especially critical in systems with higher capacitive loads that could create
higher transient currents in the VDD and VSS circuits.
Take special care to minimize noise levels on the VREF, VDDA and VSSA pins
Designs that utilize the TRST pin for JTAG port or EOnCE module functionality (such as
development or debugging systems) should allow a means to assert TRST whenever RESET is
asserted, as well as a means to assert TRST independently of RESET. Designs that do not require
debugging functionality, such as consumer products, should tie these pins together.
Because the Flash memory is programmed through the JTAG/EOnCE port, the designer should
provide an interface to this port to allow in-circuit Flash programming
12.3 Power Distribution and I/O Ring Implementation
Figure 12-1 illustrates the general power control incorporated in the 56F8355. This chip contains
an internal regulator which cannot be disabled. The regulator takes regulated 3.3V power from the
VDD_IO pins and provides 2.5V to the internal logic of the chip. This means the entire part is
powered from the 3.3V supply.
Notes:
Flash, RAM and internal logic are powered from the core regulator output
VPP1 and VPP2 are not connected in the customer system
All circuitry, analog and digital, shares a common VSS bus
Figure 12-1 56F8355 Power Management
REG
CORE
VCAP
I/O
ADC
VDD
VSS
OCS
REG
VDDA_OSC_PLL
ROSC
VSSA_ADC
VDDA_ADC
VREFH
VREFP
VREFMID
VREFN
VREFLO
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