參數(shù)資料
型號(hào)： LPC2470FBD208
廠商： NXP Semiconductors N.V.
元件分類： 數(shù)學(xué)處理器
英文描述： Flashless 16-bit-32-bit microcontroller; Ethernet, CAN, LCD, USB 2.0 device-host-OTG, external memory interface
封裝： LPC2470FBD208<SOT459-1 (LQFP208)|<<http://www.nxp.com/packages/SOT459-1.html<1<Always Pb-free,;LPC2470FET208<SOT950-1 (TFBGA208)|<<http://www.nxp.com/packages/SOT950-1.ht
文件頁數(shù)： 80/91頁
文件大小： 747K
代理商： LPC2470FBD208
LPC2470
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 4 — 8 September 2011
80 of 91
NXP Semiconductors
LPC2470
Flashless 16-bit/32-bit microcontroller
Table 23.
14.5 RTC 32 kHz oscillator component selection
The RTC external oscillator circuit is shown in
Figure 31
. 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 24
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 24
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 24.
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 31. 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
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