LPC81XM datasheet(60/78 Pages) NXP

60 / 78 page

LPC81XM

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Product data sheet

Rev. 4.6 — 4 April 2018

60 of 78

NXP Semiconductors

LPC81xM

32-bit ARM Cortex-M0+ microcontroller

RS). Capacitance CP in Figure 37 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 (see Table 26).

Fig 37. Oscillator modes and models: oscillation mode of operation and external crystal

model used for CX1/CX2 evaluation

Table 26.

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 27.

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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