参数资料
型号: MC56F8155VFGE
厂商: Freescale Semiconductor
文件页数: 74/172页
文件大小: 0K
描述: IC DSP 16BIT 40MHZ 128-LQFP
标准包装: 72
系列: 56F8xxx
核心处理器: 56800E
芯体尺寸: 16-位
速度: 40MHz
连通性: EBI/EMI,SCI,SPI
外围设备: POR,PWM,WDT
输入/输出数: 49
程序存储器容量: 256KB(128K x 16)
程序存储器类型: 闪存
RAM 容量: 8K x 16
电压 - 电源 (Vcc/Vdd): 2.25 V ~ 3.6 V
数据转换器: A/D 16x12b
振荡器型: 外部
工作温度: -40°C ~ 105°C
封装/外壳: 128-LQFP
包装: 托盘
Power Distribution and I/O Ring Implementation
56F8355 Technical Data, Rev. 17
Freescale Semiconductor
165
Preliminary
Bypass the VDD and VSS layers of the PCB with approximately 100μF, preferably with a high-grade
capacitor such as a tantalum capacitor
Because the device’s output signals have fast rise and fall times, PCB trace lengths should be minimal
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 56F8355/56F8155. This chip
contains two internal power regulators. One of them is powered from the VDDA_OSC_PLL pin and cannot
be turned off. This regulator controls power to the internal clock generation circuitry. The other regulator
is powered from the VDD_IO pins and provides power to all of the internal digital logic of the core, all
peripherals and the internal memories. This regulator can be turned off, if an external VDD_CORE voltage
is externally applied to the VCAP pins.
In summary, the entire chip can be supplied from a single 3.3 volt supply if the large core regulator is
enabled. If the regulator is not enabled, a dual supply 3.3V/2.5V configuration can also be used.
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 Power Management
REG
CORE
VCAP
I/O
ADC
VDD
VSS
REG
VDDA_OSC_PLL
OSC
VSSA_ADC
VDDA_ADC
VREFH
VREFP
VREFMID
VREFN
VREFLO
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