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參數資料
| 型號： | OM13013,598 |
| 廠商： | NXP Semiconductors |
| 文件頁數： | 46/61頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DEMO IAR LPC1227 JLINKLITE |
| 標準包裝： | 1 |
| 類型： | MCU |
| 適用于相關產品： | LPC1227 |
| 所含物品： | 板 |
| 其它名稱： | 568-6885 |
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LPC122X
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2 — 26 August 2011
50 of 61
NXP Semiconductors
LPC122x
32-bit ARM Cortex-M0 microcontroller
12. Application information
12.1 XTAL input
The input voltage to the on-chip oscillators is limited to 1.8 V. If the oscillator is driven by a
clock in slave mode, it is recommended that the input be coupled through a capacitor with
Ci = 100 pF. To limit the input voltage to the specified range, choose an additional
capacitor to ground Cg which attenuates the input voltage by a factor Ci/(Ci + Cg). In slave
mode, a minimum of 200 mV(RMS) is needed.
12.2 XTAL Printed Circuit Board (PCB) layout guidelines
The crystal should be connected on the PCB as close as possible to the oscillator input
and output pins of the chip. Take care that the load capacitors Cx1,Cx2, and Cx3 in case of
third overtone crystal usage have a common ground plane. The external components
must also be connected to the ground plain. Loops must be made as small as possible in
order to keep the noise coupled in via the PCB as small as possible. Also parasitics
should stay as small as possible. Values of Cx1 and Cx2 should be chosen smaller
accordingly to the increase in parasitics of the PCB layout.
Fig 24. Slave mode operation of the on-chip oscillator
LPC1xxx
XTALIN
Ci
100 pF
Cg
002aae788
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相關代理商/技術參數 |
參數描述 |
|---|---|
| OM13014 | 制造商:NXP Semiconductors 功能描述:KIT DEV LPCXPRESSO LPC11U14 制造商:NXP Semiconductors 功能描述:LPC11U14, LPCXPRESSO, DEV KIT 制造商:NXP Semiconductors 功能描述:; Silicon Manufacturer:NXP; Core Architecture:ARM; Silicon Core Number:LPC11xxx ;RoHS Compliant: Yes |
| OM13014,598 | 功能描述:開發(fā)板和工具包 - ARM LPC11U14 Xpresso Board RoHS:否 制造商:Arduino 產品:Development Boards 工具用于評估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口類型:DAC, ICSP, JTAG, UART, USB 工作電源電壓:3.3 V |
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