參數(shù)資料
型號： LPC2478FBD208
廠商： NXP Semiconductors N.V.
元件分類： 數(shù)學(xué)處理器
英文描述： Single-chip 16-bit-32-bit micro; 512 kB flash, Ethernet, CAN, LCD, USB 2.0 device-host-OTG, external memory interface
封裝： LPC2478FBD208<SOT459-1 (LQFP208)|<<http://www.nxp.com/packages/SOT459-1.html<1<Always Pb-free,;LPC2478FET208<SOT950-1 (TFBGA208)|<<http://www.nxp.com/packages/SOT950-1.ht
文件頁數(shù)： 83/93頁
文件大?。?/td> 751K
代理商： LPC2478FBD208
LPC2478
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 3 — 12 September 2011
83 of 93
NXP Semiconductors
LPC2478
Single-chip 16-bit/32-bit microcontroller
Table 24.
14.4 RTC 32 kHz oscillator component selection
The RTC external oscillator circuit is shown in
Figure 29
. Since the feedback resistance is
integrated on chip, only a crystal, the capacitances C
X1
and C
X2
need to be connected
externally to the microcontroller.
Table 25
gives the crystal parameters that should be used. C
L
is the typical load
capacitance of the crystal and is usually specified by the crystal manufacturer. The actual
C
L
influences oscillation frequency. When using a crystal that is manufactured for a
different load capacitance, the circuit will oscillate at a slightly different frequency
(depending on the quality of the crystal) compared to the specified one. Therefore for an
accurate time reference it is advised to use the load capacitors as specified in
Table 25
that belong to a specific C
L
. The value of external capacitances C
X1
and C
X2
specified in
this table are calculated from the internal parasitic capacitances and the C
L
. Parasitics
from PCB and package are not taken into account.
Table 25.
Crystal load capacitance
C
L
11 pF
13 pF
15 pF
Recommended values for C
X1
/C
X2
in oscillation mode (crystal and external
components parameters): high frequency mode
Fundamental oscillation
frequency F
OSC
capacitance C
L
15 MHz to 20 MHz
10 pF
20 pF
20 MHz to 25 MHz
10 pF
20 pF
Crystal load
Maximum crystal
series resistance R
S
< 180
< 100
< 160
< 80
External load
capacitors C
X1
, C
X2
18 pF, 18 pF
39 pF, 39 pF
18 pF, 18 pF
39 pF, 39 pF
Fig 29. RTC oscillator modes and models: oscillation mode of operation and external
crystal model used for C
X1
/C
X2
evaluation
Recommended values for the RTC external 32 kHz oscillator C
X1
/C
X2
components
Maximum crystal series
resistance R
S
< 100 k
< 100 k
< 100 k
External load capacitors C
X1
/C
X2
18 pF, 18 pF
22 pF, 22 pF
27 pF, 27 pF
002aaf495
LPC2xxx
RTCX1
RTCX2
CX2
CX1
32 kHz XTAL
=
CL
CP
RS
L
相關(guān)PDF資料
PDF描述
LPC2478FET208 Single-chip 16-bit-32-bit micro; 512 kB flash, Ethernet, CAN, LCD, USB 2.0 device-host-OTG, external memory interface
LPC2917FBD144 ARM9 microcontroller with CAN and LIN
LPC2919FBD144 ARM9 microcontroller with CAN and LIN
LPC2921FBD100 ARM9 microcontroller with CAN, LIN, and USB
LPC2923FBD100 ARM9 microcontroller with CAN, LIN, and USB
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LPC2478FBD208,551 功能描述:ARM微控制器 - MCU LCD CONT/ETHNET USB/512K FL RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風(fēng)格:SMD/SMT
LPC2478FBD208,551 制造商:NXP Semiconductors 功能描述:IC, 32BIT MCU, 72MHZ, LQFP-208
LPC2478FBD208551 制造商:NXP Semiconductors 功能描述:MCU ARM7 208LQFP
LPC2478FBD208551 制造商:NXP Semiconductors 功能描述:IC 32BIT MCU 72MHZ LQFP-208
LPC2478FET,208 制造商:NXP Semiconductors 功能描述:
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*