參數(shù)資料
型號： LPC2468FBD208
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, ISP-IAP, USB 2.0 device-host-OTG, external memory interface
封裝： LPC2468FBD208<SOT459-1 (LQFP208)|<<http://www.nxp.com/packages/SOT459-1.html<1<Always Pb-free,;LPC2468FET208<SOT950-1 (TFBGA208)|<<http://www.nxp.com/packages/SOT950-1.ht
文件頁數(shù)： 74/85頁
文件大小： 682K
代理商： LPC2468FBD208
LPC2468
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 6.1 — 6 September 2011
74 of 85
NXP Semiconductors
LPC2468
Single-chip 16-bit/32-bit micro
In slave mode the input clock signal should be coupled by means of a capacitor of 100 pF
(
Figure 27
), with an amplitude between 200 mV (RMS) and 1000 mV (RMS). This
corresponds to a square wave signal with a signal swing of between 280 mV and 1.4 V.
The XTAL2 pin in this configuration can be left unconnected.
External components and models used in oscillation mode are shown in
Figure 28
and in
Table 20
and
Table 21
. Since the feedback resistance is integrated on chip, only a crystal
and the capacitances C
X1
and C
X2
need to be connected externally in case of
fundamental mode oscillation (the fundamental frequency is represented by L, C
L
and
R
S
). Capacitance C
P
in
Figure 28
represents the parallel package capacitance and should
not be larger than 7 pF. Parameters F
OSC
, C
L
, R
S
and C
P
are supplied by the crystal
manufacturer.
Table 20.
Fig 28. Oscillator modes and models: oscillation mode of operation and external crystal
model used for C
X1
/C
X2
evaluation
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
1 MHz to 5 MHz
10 pF
20 pF
30 pF
5 MHz to 10 MHz
10 pF
20 pF
30 pF
10 MHz to 15 MHz
10 pF
20 pF
15 MHz to 20 MHz
10 pF
Crystal load
Maximum crystal
series resistance R
S
< 300
< 300
< 300
< 300
< 200
< 100
< 160
< 60
< 80
External load
capacitors C
X1
/C
X2
18 pF, 18 pF
39 pF, 39 pF
57 pF, 57 pF
18 pF, 18 pF
39 pF, 39 pF
57 pF, 57 pF
18 pF, 18 pF
39 pF, 39 pF
18 pF, 18 pF
002aag469
LPC2xxx
XTAL1
XTAL2
CX2
CX1
XTAL
=
CL
CP
RS
L
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