LPC4350 datasheet(128/149 Pages) PHILIPS

128 / 149 page

LPC4350_30_20_10

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Objective data sheet

Rev. 3.1 — 5 January 2012

128 of 149

NXP Semiconductors

LPC4350/30/20/10

32-bit ARM Cortex-M4/M0 microcontroller

13.3 XTAL and RTCX Printed Circuit Board (PCB) layout guidelines

Connect the crystal 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. Also connect the external components to the

ground plain. To keep the noise coupled in via the PCB as small as possible, make loops

and parasitics as small as possible. Choose smaller values of Cx1 and Cx2 if parasitics

increase in the PCB layout.

13.4 Standard I/O pin configuration

Figure 39 shows the possible pin modes for standard I/O pins with analog input function:

• Digital output driver: Open-drain mode enabled/disabled

• Digital input: Pull-up enabled/disabled

• Digital input: Pull-down enabled/disabled

• Digital input: Repeater mode enabled/disabled

• Analog input

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.

Fig 39. Standard I/O pin configuration with analog input

VDD(IO)

ESD

VSS

ESD

strong

pull-up

strong

pull-down

VDD(IO)

weak

pull-up

weak

pull-down

open-drain enable

output enable

repeater mode

enable

pull-up enable

pull-down enable

data output

data input

analog input

select analog input

002aag701

pin configured

as digital output

driver

pin configured

as digital input

pin configured

as analog input

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