LPC81XM datasheet(48/78 Pages) NXP

48 / 78 page

LPC81XM

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Product data sheet

Rev. 4.6 — 4 April 2018

48 of 78

NXP Semiconductors

LPC81xM

32-bit ARM Cortex-M0+ microcontroller

12.4 Internal oscillators

[1]

Parameters are valid over operating temperature range unless otherwise specified.

[2]

Typical ratings are not guaranteed. The values listed are for room temperature (25

C), nominal supply

voltages.

[1]

Typical ratings are not guaranteed. The values listed are at nominal supply voltages.

[2]

The typical frequency spread over processing and temperature (Tamb = 40 C to +105 C) is 40 %.

[3]

See the LPC81xM user manual.

Table 14.

Dynamic characteristics: IRC

Tamb = 40 C to +105 C; 2.7 V  VDD  3.6 V[1].

Symbol

Parameter

Conditions

Min

Typ[2]

Max

Unit

fosc(RC)

internal RC oscillator

frequency

Tamb = 40 C to

+105

C

11.82

12.18

MHz

Conditions: Frequency values are typical values. 12 MHz

 1.5 % accuracy is guaranteed for

2.7 V

 V

DD  3.6 V and Tamb = 40 C to +105 C. Variations between parts may cause the IRC to

fall outside the 12 MHz

 1.5 % accuracy specification for voltages below 2.7 V.

Fig 30. Typical Internal RC oscillator frequency versus temperature

Table 15.

Dynamic characteristics: Watchdog oscillator

Symbol

Parameter

Conditions

Min

Typ[1] Max Unit

fosc(int)

internal oscillator

frequency

DIVSEL = 0x1F, FREQSEL = 0x1

in the WDTOSCCTRL register;

[2][3] -9.4

kHz

DIVSEL = 0x00, FREQSEL = 0xF

in the WDTOSCCTRL register

[2][3] -

2300

kHz

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