LPC2458 NXP Semiconductors, LPC2458 Datasheet - Page 70

NXP Semiconductors designed the LPC2458 microcontroller around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded trace

LPC2458

Manufacturer Part Number
LPC2458
Description
NXP Semiconductors designed the LPC2458 microcontroller around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded trace
Manufacturer
NXP Semiconductors
Datasheet

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LPC2458
Product data sheet
In slave mode the input clock signal should be coupled by means of a capacitor of 100 pF
(Figure
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
Table 20
and the capacitances C
fundamental mode oscillation (the fundamental frequency is represented by L, C
R
not be larger than 7 pF. Parameters F
manufacturer.
Table 20.
Fundamental oscillation
frequency F
1 MHz to 5 MHz
5 MHz to 10 MHz
15 MHz to 20 MHz
10 MHz to 15 MHz
Fig 27. Oscillator modes and models: oscillation mode of operation and external crystal
S
). Capacitance C
26), with an amplitude between 200 mV (RMS) and 1000 mV (RMS). This
and
model used for C
Recommended values for C
components parameters): low frequency mode
OSC
Table
All information provided in this document is subject to legal disclaimers.
XTAL1
P
C X1
21. Since the feedback resistance is integrated on chip, only a crystal
LPC2xxx
in
Rev. 4 — 1 September 2011
Figure 27
X1
XTAL
X1
and C
Crystal load
capacitance C
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
10 pF
20 pF
10 pF
/C
X2
XTAL2
X2
evaluation
C X2
represents the parallel package capacitance and should
need to be connected externally in case of
OSC
X1
/C
L
, C
X2
in oscillation mode (crystal and external
L
Maximum crystal
series resistance R
< 300 
< 300 
< 300 
< 300 
< 200 
< 100 
< 160 
< 60 
< 80 
, R
S
and C
=
P
Single-chip 16-bit/32-bit micro
are supplied by the crystal
S
L
C L
R S
002aag469
External load
capacitors C
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
LPC2458
© NXP B.V. 2011. All rights reserved.
C P
Figure 27
L
X1
and
/C
and in
70 of 80
X2

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