參數(shù)資料
型號(hào)： LPC2148FBD64
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 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)： 37/45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
37 of 45
NXP Semiconductors
LPC2141/42/44/46/48
Single-chip 16-bit/32-bit microcontrollers
In slave mode the input clock signal should be coupled by means of a capacitor of 100 pF
(
Figure 12
), 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 13
and in
Table 10
and
Table 11
. 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 13
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 10.
Fig 12. Slave mode operation of the on-chip oscillator
Fig 13. 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
Crystal load
Maximum crystal
series resistance R
S
< 300
< 300
< 300
External load
capacitors C
X1
/C
X2
18 pF, 18 pF
39 pF, 39 pF
57 pF, 57 pF
LPC2xxx
XTAL1
Ci
100 pF
Cg
002aae718
002aag469
LPC2xxx
XTAL1
XTAL2
CX2
CX1
XTAL
=
CL
CP
RS
L
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