LPC83X datasheet(65/78 Pages) NXP

65 / 78 page

LPC83x

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Product data sheet

Rev. 1.2 — 4 April 2018

65 of 78

NXP Semiconductors

LPC83x

32-bit ARM Cortex-M0+ microcontroller

14.2 XTAL Printed-Circuit Board (PCB) layout guidelines

The crystal should be connected 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. The external components

must also be connected to the ground plain. Loops must be made as small as possible in

Fig 40. Oscillator modes and models: oscillation mode of operation and external crystal

model used for CX1/CX2 evaluation

Table 24.

Recommended values for CX1/CX2 in oscillation mode (crystal and external

components parameters) low frequency mode

Fundamental oscillation

frequency FOSC

Crystal load

capacitance CL

Maximum crystal

series resistance RS

External load

capacitors CX1, CX2

1 MHz to 5 MHz

10 pF

< 300



18 pF, 18 pF

20 pF

< 300



39 pF, 39 pF

30 pF

< 300



57 pF, 57 pF

5 MHz to 10 MHz

10 pF

< 300



18 pF, 18 pF

20 pF

< 200



39 pF, 39 pF

30 pF

< 100



57 pF, 57 pF

10 MHz to 15 MHz

10 pF

< 160



18 pF, 18 pF

20 pF

< 60



39 pF, 39 pF

15 MHz to 20 MHz

10 pF

< 80



18 pF, 18 pF

Table 25.

Recommended values for CX1/CX2 in oscillation mode (crystal and external

components parameters) high frequency mode

Fundamental oscillation

frequency FOSC

Crystal load

capacitance CL

Maximum crystal

series resistance RS

External load

capacitors CX1, CX2

15 MHz to 20 MHz

10 pF

< 180



18 pF, 18 pF

20 pF

< 100



39 pF, 39 pF

20 MHz to 25 MHz

10 pF

< 160



18 pF, 18 pF

20 pF

< 80



39 pF, 39 pF

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