LPC1759FBD80 NXP Semiconductors, LPC1759FBD80 Datasheet - Page 64
Manufacturer Part Number
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
Product data sheet
Fig 31. LPC1759/58/56/54/52/51 USB device port configuration
14.2 Crystal oscillator XTAL input and component selection
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
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
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
and the capacitances C
fundamental mode oscillation (the fundamental frequency is represented by L, C
not be larger than 7 pF. Parameters F
Fig 32. Slave mode operation of the on-chip oscillator
= 100 pF. To limit the input voltage to the specified range, choose an additional
). Capacitance C
32), with an amplitude between 200 mV(RMS) and 1000 mV(RMS). This
All information provided in this document is subject to legal disclaimers.
22. Since the feedback resistance is integrated on chip, only a crystal
which attenuates the input voltage by a factor C
Rev. 7 — 29 March 2011
represents the parallel package capacitance and should
need to be connected externally in case of
32-bit ARM Cortex-M3 microcontroller
are supplied by the crystal
© NXP B.V. 2011. All rights reserved.
). In slave
64 of 74