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LPC1227FBD64301 Datasheet(PDF) 51 Page - NXP Semiconductors

Part No. LPC1227FBD64301
Description  32-bit ARM Cortex-M0 microcontroller; up to 128 kB flash and 8 kB SRAM
Download  60 Pages
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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LPC1227FBD64301 Datasheet(HTML) 51 Page - NXP Semiconductors

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LPC122X
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Objective data sheet
Rev. 1.1 — 21 February 2011
51 of 60
NXP Semiconductors
LPC122x
32-bit ARM Cortex-M0 microcontroller
12. Application information
12.1 XTAL input
The input voltage to the on-chip oscillators is limited to 1.8 V. If the oscillator is driven by a
clock in slave mode, it is recommended that the input be coupled through a capacitor with
Ci = 100 pF. To limit the input voltage to the specified range, choose an additional
capacitor to ground Cg which attenuates the input voltage by a factor Ci/(Ci + Cg). In slave
mode, a minimum of 200 mV(RMS) is needed.
12.2 XTAL 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
order to keep the noise coupled in via the PCB as small as possible. Also parasitics
should stay as small as possible. Values of Cx1 and Cx2 should be chosen smaller
accordingly to the increase in parasitics of the PCB layout.
Fig 23. Slave mode operation of the on-chip oscillator
LPC1xxx
XTALIN
Ci
100 pF
Cg
002aae788


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