LPC11U35FBD48401 datasheet(56/76 Pages) NXP

Part #	LPC11U35FBD48401

Description	32-bit ARM Cortex-M0 microcontroller up to 128 kB flash up to 12 kB SRAM and 4 kB EEPROM USB device USART

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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LPC11U3X

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Product data sheet

Rev. 2 — 25 November 2013

56 of 76

NXP Semiconductors

LPC11U3x

32-bit ARM Cortex-M0 microcontroller

11.2 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.

In slave mode, couple the input clock signal with a capacitor of 100 pF (Figure 29), with an

amplitude between 200 mV (RMS) and 1000 mV (RMS). This signal 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 Figure 30 and in

Table 18 and Table 19. Since the feedback resistance is integrated on chip, only a crystal

and the capacitances CX1 and CX2 need to be connected externally in case of

fundamental mode oscillation (L, CL and RS represent the fundamental frequency).

Capacitance CP in Figure 30 represents the parallel package capacitance and must not be

larger than 7 pF. Parameters FOSC, CL, RS and CP are supplied by the crystal

manufacturer.

Fig 29. Slave mode operation of the on-chip oscillator

Fig 30. Oscillator modes and models: oscillation mode of operation and external crystal

model used for CX1/CX2 evaluation

LPC1xxx

XTALIN

Ci

100 pF

Cg

002aae788

002aaf424

LPC1xxx

XTALIN

XTALOUT

CX2

CX1

XTAL

=

CL

CP

RS

L

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LPC11U35FBD48401 Datasheet(PDF) 56 Page - NXP Semiconductors

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