LPC1788FBD144 NXP Semiconductors, LPC1788FBD144 Datasheet - Page 104

• Manufacturer Part Number: LPC1788FBD144
• Description: The LPC1788 is a Cortex-M3 microcontroller for embedded applications featuring a high level of integration and low power consumption at frequencies of 120 MHz
• Manufacturer: NXP Semiconductors

NXP Semiconductors
LPC178X_7X
Objective 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 XTALOUT pin in this configuration can be left unconnected.
External components and models used in oscillation mode are shown in
Table 34
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 34.
Fundamental oscillation
frequency F
1 MHz - 5 MHz
Fig 37. Slave mode operation of the on-chip oscillator
Fig 38. Oscillator modes and models: oscillation mode of operation and external crystal
S
). Capacitance C
37), 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.
XTALIN
P
C X1
35. Since the feedback resistance is integrated on chip, only a crystal
LPC1xxx
in
Rev. 3 — 27 December 2011
Figure 38
X1
XTAL
X1
and C
Crystal load
capacitance C
10 pF
20 pF
30 pF
/C
X2
XTALOUT
X2
evaluation
C X2
represents the parallel package capacitance and should
need to be connected externally in case of
OSC
X1
XTAL1
LPC1xxx
C i
100 pF
/C
L
, C
X2
in oscillation mode (crystal and external
L
Maximum crystal
series resistance R
< 300 
< 300 
< 300 
, R
S
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32-bit ARM Cortex-M3 microcontroller
C g
and C
=
P
are supplied by the crystal
S
LPC178x/7x
L
C L
R S
External load
capacitors C
18 pF, 18 pF
39 pF, 39 pF
57 pF, 57 pF
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© NXP B.V. 2011. All rights reserved.
C P
Figure 38
L
X1
104 of 120
and
/C
and in
X2