LPC1759FBD80 NXP Semiconductors, LPC1759FBD80 Datasheet - Page 64

The LPC1759 is a Cortex-M3 microcontroller for embedded applications featuring a high level of integration and low power consumption at frequencies of 120 MHz

LPC1759FBD80

Manufacturer Part Number
LPC1759FBD80
Description
The LPC1759 is a Cortex-M3 microcontroller for embedded applications featuring a high level of integration and low power consumption at frequencies of 120 MHz
Manufacturer
NXP Semiconductors
Datasheet

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NXP Semiconductors
LPC1759_58_56_54_52_51
Product data sheet
Fig 31. LPC1759/58/56/54/52/51 USB device port configuration
14.2 Crystal oscillator XTAL input and component selection
LPC17xx
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
C
capacitor to ground C
mode, a minimum of 200 mV(RMS) is needed.
In slave mode the input clock signal should be coupled by means of a capacitor of 100 pF
(Figure
corresponds to a square wave signal with a signal swing of between 280 mV and 1.4 V.
The XTALOUT pin in this configuration can be left unconnected.
External components and models used in oscillation mode are shown in
Table 21
and the capacitances C
fundamental mode oscillation (the fundamental frequency is represented by L, C
R
not be larger than 7 pF. Parameters F
manufacturer.
Fig 32. Slave mode operation of the on-chip oscillator
i
S
= 100 pF. To limit the input voltage to the specified range, choose an additional
). Capacitance C
USB_UP_LED
USB_CONNECT
USB_D+
USB_D−
V
BUS
32), with an amplitude between 200 mV(RMS) and 1000 mV(RMS). This
and
Table
All information provided in this document is subject to legal disclaimers.
33 Ω
33 Ω
P
22. Since the feedback resistance is integrated on chip, only a crystal
in
g
V
which attenuates the input voltage by a factor C
Rev. 7 — 29 March 2011
Figure 33
X1
DD
and C
V
DD
X2
represents the parallel package capacitance and should
need to be connected externally in case of
OSC
XTAL1
LPC1759/58/56/54/52/51
LPC1xxx
C i
100 pF
, C
L
, R
S
002aae835
32-bit ARM Cortex-M3 microcontroller
C g
and C
P
are supplied by the crystal
V
SS
V
BUS
D+
D−
USB-B
connector
002aad943
i
/(C
© NXP B.V. 2011. All rights reserved.
Figure 33
i
+ C
g
). In slave
L
and
and in
64 of 74

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