LPC2420_60 NXP Semiconductors, LPC2420_60 Datasheet - Page 74

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LPC2420_60

Manufacturer Part Number
LPC2420_60
Description
NXP Semiconductors designed the LPC2420/2460 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
NXP Semiconductors
LPC2420_60
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 19
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 19.
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 30. Oscillator modes and models: oscillation mode of operation and external crystal
S
). Capacitance C
29), 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
20. Since the feedback resistance is integrated on chip, only a crystal
LPC2xxx
Rev. 6.1 — 22 September 2011
in
Figure 30
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
Flashless 16-bit/32-bit microcontroller
and C
=
P
are supplied by the crystal
LPC2420/2460
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
© NXP B.V. 2011. All rights reserved.
C P
Figure 30
L
X1
and
/C
and in
74 of 86
X2

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