LPC2420_60

Manufacturer Part NumberLPC2420_60
DescriptionNXP Semiconductors designed the LPC2420/2460 microcontroller around a 16-bit/32-bitARM7TDMI-S CPU core with real-time debug interfaces that include both JTAG andembedded trace
ManufacturerNXP Semiconductors
LPC2420_60 datasheet
 


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NXP Semiconductors
14.5 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 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
order to keep the noise coupled in via the PCB as small as possible. Also parasitics
should stay as small as possible. Values of C
accordingly to the increase in parasitics of the PCB layout.
14.6 Standard I/O pin configuration
Figure 32
Digital output driver
Digital input: Pull-up enabled/disabled
Digital input: Pull-down enabled/disabled
Analog input (for ADC input channels)
The default configuration for standard I/O pins is input with pull-up enabled. The weak
MOS devices provide a drive capability equivalent to pull-up and pull-down resistors.
pin configured
as digital output
pin configured
as digital input
pin configured
as analog input
Fig 32. Standard I/O pin configuration with analog input
LPC2420_60
Product data sheet
shows the possible pin modes for standard I/O pins with analog input function:
output enable
output
driver
pull-down enable
data input
analog input
All information provided in this document is subject to legal disclaimers.
Rev. 6.1 — 22 September 2011
LPC2420/2460
Flashless 16-bit/32-bit microcontroller
, C
x1
x2
and C
should be chosen smaller
x1
x2
V
DD
weak
pull-up
pull-up enable
weak
pull-down
select analog input
, and C
in case of
x3
V
DD
ESD
PIN
ESD
V
SS
002aaf496
© NXP B.V. 2011. All rights reserved.
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