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LPC1763 Datasheet(PDF) 69 Page - NXP Semiconductors

Part # LPC1763
Description  32-bit ARM Cortex-M3 microcontroller; up to 512 kB flash and 64 kB SRAM with Ethernet
PDF  79 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

LPC1763 Datasheet(HTML) 69 Page - NXP Semiconductors

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LPC1769_68_67_66_65_64_63
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 7 — 5 April 2011
69 of 79
NXP Semiconductors
LPC1769/68/67/66/65/64/63
32-bit ARM Cortex-M3 microcontroller
14.3 XTAL and RTCX Printed Circuit Board (PCB) layout guidelines
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 Cx1, Cx2, and Cx3 in case of
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
Fig 34. Oscillator modes and models: oscillation mode of operation and external crystal
model used for CX1/CX2 evaluation
Table 22.
Recommended values for CX1/CX2 in oscillation mode (crystal and external
components parameters): low frequency mode
Fundamental oscillation
frequency FOSC
Crystal load
capacitance CL
Maximum crystal
series resistance RS
External load
capacitors CX1/CX2
1 MHz - 5 MHz
10 pF
< 300
Ω
18 pF, 18 pF
20 pF
< 300
Ω
39 pF, 39 pF
30 pF
< 300
Ω
57 pF, 57 pF
5 MHz - 10 MHz
10 pF
< 300
Ω
18 pF, 18 pF
20 pF
< 200
Ω
39 pF, 39 pF
30 pF
< 100
Ω
57 pF, 57 pF
10 MHz - 15 MHz
10 pF
< 160
Ω
18 pF, 18 pF
20 pF
< 60
Ω
39 pF, 39 pF
15 MHz - 20 MHz
10 pF
< 80
Ω
18 pF, 18 pF
Table 23.
Recommended values for CX1/CX2 in oscillation mode (crystal and external
components parameters): high frequency mode
Fundamental oscillation
frequency FOSC
Crystal load
capacitance CL
Maximum crystal
series resistance RS
External load
capacitors CX1, CX2
15 MHz - 20 MHz
10 pF
< 180
Ω
18 pF, 18 pF
20 pF
< 100
Ω
39 pF, 39 pF
20 MHz - 25 MHz
10 pF
< 160
Ω
18 pF, 18 pF
20 pF
< 80
Ω
39 pF, 39 pF
002aaf424
LPC1xxx
XTALIN
XTALOUT
CX2
CX1
XTAL
=
CL
CP
RS
L



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