OM13001,598 NXP Semiconductors, OM13001,598 Datasheet - Page 102
![EA LPC177X/8X EVAL BOARD](/photos/40/8/400885/om13001_598_sml.jpg)
OM13001,598
Manufacturer Part Number
OM13001,598
Description
EA LPC177X/8X EVAL BOARD
Manufacturer
NXP Semiconductors
Series
-r
Type
MCUr
Specifications of OM13001,598
Contents
Board, Cable, Headphones, Registration Card
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
LPC1788
Other names
568-6707
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NXP Semiconductors
LPC178X_7X
Objective data sheet
14.3 XTAL Printed-Circuit Board (PCB) layout guidelines
Table 32.
Table 33.
The crystal should be connected on the PCB as close as possible to the oscillator input
and output pins of the chip. Take care that the load capacitors C
third overtone crystal usage have a common ground plane. The external components
must also be connected to the ground plain. Loops must be made as small as possible in
Fundamental oscillation
frequency F
5 MHz - 10 MHz
10 MHz - 15 MHz
15 MHz - 20 MHz
Fundamental oscillation
frequency F
15 MHz - 20 MHz
20 MHz - 25 MHz
1 MHz - 5 MHz
Fig 39. Oscillator modes and models: oscillation mode of operation and external crystal
model used for C
Recommended values for C
components parameters): low frequency mode
Recommended values for C
components parameters): high frequency mode
OSC
OSC
All information provided in this document is subject to legal disclaimers.
XTALIN
C X1
LPC1xxx
Rev. 2 — 27 May 2011
XTAL
X1
Crystal load
capacitance C
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
10 pF
20 pF
10 pF
Crystal load
capacitance C
10 pF
20 pF
10 pF
20 pF
/C
X2
XTALOUT
evaluation
C X2
X1
X1
/C
/C
L
L
X2
X2
in oscillation mode (crystal and external
in oscillation mode (crystal and external
Maximum crystal
series resistance R
< 300
< 300
< 300
< 300
< 200
< 100
< 160
< 60
< 80
Maximum crystal
series resistance R
< 180
< 100
< 160
< 80
32-bit ARM Cortex-M3 microcontroller
=
x1
S
S
LPC178x/7x
, C
L
C L
R S
x2
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
External load
capacitors C
18 pF, 18 pF
39 pF, 39 pF
18 pF, 18 pF
39 pF, 39 pF
002aaf424
, and C
© NXP B.V. 2011. All rights reserved.
C P
x3
in case of
X1
X1
102 of 117
/C
,
CX2
X2
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