LPC1313 datasheet(51/62 Pages) NXP

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LPC1311_13_42_43

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Product data sheet

Rev. 3 — 10 August 2010

51 of 62

NXP Semiconductors

LPC1311/13/42/43

32-bit ARM Cortex-M3 microcontroller

In slave mode the input clock signal should be coupled by means of a capacitor of 100 pF

(Figure 28), with an amplitude between 200 mV(RMS) and 1000 mV(RMS). This

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 29 and in

Table 19 and Table 20. 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 (the fundamental frequency is represented by L, CL and

RS). Capacitance CP in Figure 29 represents the parallel package capacitance and should

not be larger than 7 pF. Parameters FOSC, CL, RS and CP are supplied by the crystal

manufacturer.

Fig 28. Slave mode operation of the on-chip oscillator

Fig 29. Oscillator modes and models: oscillation mode of operation and external crystal

model used for CX1/CX2 evaluation

LPC1xxx

XTALIN

100 pF

002aae788

002aaf424

LPC1xxx

XTALIN

XTALOUT

CX2

CX1

XTAL

LPC1313 Datasheet(PDF) 51 Page - NXP Semiconductors