參數(shù)資料
型號： LPC2144FBD64
廠商： NXP Semiconductors N.V.
元件分類： 數(shù)學處理器
英文描述： Single-chip 16-bit-32-bit microcontrollers; up to 512 kB flash with ISP-IAP, USB 2.0 full-speed device, 10-bit ADC and DAC
封裝： LPC2141FBD64<SOT314-2 (LQFP64)|<<http://www.nxp.com/packages/SOT314-2.html<1<Always Pb-free,;LPC2142FBD64<SOT314-2 (LQFP64)|<<http://www.nxp.com/packages/SOT314-2.html<
文件頁數(shù)： 38/45頁
文件大?。?/td> 391K
代理商： LPC2144FBD64
LPC2141_42_44_46_48
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 5 — 12 August 2011
38 of 45
NXP Semiconductors
LPC2141/42/44/46/48
Single-chip 16-bit/32-bit microcontrollers
Table 11.
12.3 RTC 32 kHz oscillator component selection
The RTC external oscillator circuit is shown in
Figure 14
. 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 12
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 12
5 MHz to 10 MHz
10 pF
20 pF
30 pF
10 pF
20 pF
10 pF
< 300
< 200
< 100
< 160
< 60
< 80
18 pF, 18 pF
39 pF, 39 pF
57 pF, 57 pF
18 pF, 18 pF
39 pF, 39 pF
18 pF, 18 pF
10 MHz to 15 MHz
15 MHz to 20 MHz
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
Table 10.
Recommended values for C
X1
/C
X2
in oscillation mode (crystal and external
components parameters): low frequency mode
Fundamental oscillation
frequency F
OSC
capacitance C
L
Crystal load
Maximum crystal
series resistance R
S
External load
capacitors C
X1
/C
X2
Fig 14. RTC oscillator modes and models: oscillation mode of operation and external
crystal model used for C
X1
/C
X2
evaluation
002aaf495
LPC2xxx
RTCX1
RTCX2
CX2
CX1
32 kHz XTAL
=
CL
CP
RS
L
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LPC2144FBD64,151 功能描述:ARM微控制器 - MCU ARM7 128KF/16KR/USB 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 安裝風格:SMD/SMT
LPC2144FBD64/S500, 制造商:NXP Semiconductors 功能描述:PHALPC2144FBD64/S500,151 16-BIT/32-BIT M
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