參數資料
型號: LPC2103FBD48,118
廠商: NXP Semiconductors
文件頁數: 28/37頁
文件大小: 0K
描述: IC ARM7 MCU FLASH 32K 48-LQFP
標準包裝: 2,000
系列: LPC2100
核心處理器: ARM7
芯體尺寸: 16/32-位
速度: 70MHz
連通性: I²C,Microwire,SPI,SSI,SSP,UART/USART
外圍設備: POR,PWM,WDT
輸入/輸出數: 32
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
RAM 容量: 8K x 8
電壓 - 電源 (Vcc/Vdd): 1.65 V ~ 3.6 V
數據轉換器: A/D 8x10b
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 48-LQFP
包裝: 帶卷 (TR)
配用: 568-4302-ND - BOARD EVAL LPC210X KS2103 JLINK
568-4301-ND - BOARD EVAL LPC210X KS2103
568-4300-ND - BOARD EVAL LPC210X MCB2103
568-4297-ND - BOARD EVAL LPC21XX MCB2100
MCB2103UME-ND - BOARD EVAL MCB2103 + ULINK-ME
MCB2103U-ND - BOARD EVAL MCB2103 + ULINK2
622-1013-ND - BOARD FOR LPC2103 48-LQFP
622-1008-ND - BOARD FOR LPC9103 10-HVSON
其它名稱: 935280966118
LPC2103FBD48-T
LPC2103FBD48-T-ND
PIC18F85J90 FAMILY
DS39770C-page 34
2010 Microchip Technology Inc.
2.6
External Oscillator Pins
Many microcontrollers have options for at least two
oscillators: a high-frequency primary oscillator and a
low-frequency
secondary
oscillator
(refer
to
The oscillator circuit should be placed on the same
side of the board as the device. Place the oscillator
circuit close to the respective oscillator pins with no
more than 0.5 inch (12 mm) between the circuit
components and the pins. The load capacitors should
be placed next to the oscillator itself, on the same side
of the board.
Use a grounded copper pour around the oscillator cir-
cuit to isolate it from surrounding circuits. The
grounded copper pour should be routed directly to the
MCU ground. Do not run any signal traces or power
traces inside the ground pour. Also, if using a two-sided
board, avoid any traces on the other side of the board
where the crystal is placed.
Layout suggestions are shown in Figure 2-4. In-line
packages may be handled with a single-sided layout
that completely encompasses the oscillator pins. With
fine-pitch packages, it is not always possible to com-
pletely surround the pins and components. A suitable
solution is to tie the broken guard sections to a mirrored
ground layer. In all cases, the guard trace(s) must be
returned to ground.
In planning the application’s routing and I/O assign-
ments, ensure that adjacent port pins and other signals
in close proximity to the oscillator are benign (i.e., free
of high frequencies, short rise and fall times, and other
similar noise).
For additional information and design guidance on
oscillator circuits, please refer to these Microchip
Application Notes, available at the corporate web site
(www.microchip.com):
AN826, “Crystal Oscillator Basics and Crystal
Selection for rfPIC and PICmicro Devices”
AN849, “Basic PICmicro Oscillator Design”
AN943, “Practical PICmicro Oscillator Analysis
and Design”
AN949, “Making Your Oscillator Work”
2.7
Unused I/Os
Unused I/O pins should be configured as outputs and
driven to a logic low state. Alternatively, connect a 1 k
to 10 k resistor to VSS on unused pins and drive the
output to logic low.
FIGURE 2-4:
SUGGESTED PLACEMENT
OF THE OSCILLATOR
CIRCUIT
GND
`
OSC1
OSC2
T1OSO
T1OS I
Copper Pour
Primary Oscillator
Crystal
Timer1 Oscillator
Crystal
DEVICE PINS
Primary
Oscillator
C1
C2
T1 Oscillator: C1
T1 Oscillator: C2
(tied to ground)
Single-Sided and In-Line Layouts:
Fine-Pitch (Dual-Sided) Layouts:
GND
OSCO
OSCI
Bottom Layer
Copper Pour
Oscillator
Crystal
Top Layer Copper Pour
C2
C1
DEVICE PINS
(tied to ground)
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