參數(shù)資料
型號: LPC2148FBD64
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): 39/45頁
文件大?。?/td> 391K
代理商: LPC2148FBD64
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
39 of 45
NXP Semiconductors
LPC2141/42/44/46/48
Single-chip 16-bit/32-bit microcontrollers
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 12.
Crystal load capacitance
C
L
11 pF
13 pF
15 pF
12.4 XTAL and RTCX 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 C
x1
, C
x2
, and C
x3
in case of
third overtone crystal usage have a common ground plane. The external components
must also be connected to the ground plane. 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 C
x1
and C
x2
should be chosen smaller
accordingly to the increase in parasitics of the PCB layout.
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
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