LPC2478 NXP Semiconductors, LPC2478 Datasheet - Page 82

• Manufacturer Part Number: LPC2478
• Description: NXP Semiconductors designed the LPC2478 microcontroller, powered by theARM7TDMI-S core, to be a highly integrated microcontroller for a wide range ofapplications that require advanced communications and high quality graphic displays
• Manufacturer: NXP Semiconductors

NXP Semiconductors
LPC2478
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 23
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 23.
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 28. Oscillator modes and models: oscillation mode of operation and external crystal
S
). Capacitance C
27), 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
24. Since the feedback resistance is integrated on chip, only a crystal
LPC2xxx
in
Rev. 3 — 12 September 2011
Figure 28
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
Single-chip 16-bit/32-bit microcontroller
S
and C
=
P
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
LPC2478
© NXP B.V. 2011. All rights reserved.
C P
Figure 28
L
X1
and
/C
and in
82 of 93
X2