參數(shù)資料
型號(hào)： LPC12D27FBD100/301
廠商： NXP Semiconductors
文件頁數(shù)： 32/46頁
文件大?。?/td> 0K
描述： MCU 32BIT ARM CORTEX-M0 100-LQFP
標(biāo)準(zhǔn)包裝： 90
系列： LPC1200
核心處理器： ARM? Cortex?-M0
芯體尺寸： 32-位
速度： 45MHz
連通性： I²C，IrDA，SPI，SSP，UART/USART
外圍設(shè)備： 欠壓檢測(cè)/復(fù)位，DMA，LCD，POR，PWM，WDT
輸入/輸出數(shù)： 40
程序存儲(chǔ)器容量： 128KB（128K x 8）
程序存儲(chǔ)器類型： 閃存
RAM 容量： 8K x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 100-LQFP
包裝： 托盤
其它名稱： 568-8372
LPC12D27
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 1 — 20 September 2011
38 of 46
NXP Semiconductors
LPC12D27
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 23. Slave mode operation of the on-chip oscillator
LPC1xxx
XTALIN
Ci
100 pF
Cg
002aae788
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