LPC1313 datasheet(43/62 Pages) NXP

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LPC1311_13_42_43

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Product data sheet

Rev. 3 — 10 August 2010

43 of 62

NXP Semiconductors

LPC1311/13/42/43

32-bit ARM Cortex-M3 microcontroller

10.3 Internal oscillators

[1]

Parameters are valid over operating temperature range unless otherwise specified.

[2]

Typical ratings are not guaranteed. The values listed are at 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 +85 °C) is ±40 %.

[3]

See the LPC13xx user manual.

Table 13.

Dynamic characteristics: IRC

Tamb =

−40 °C to +85 °C; 2.7 V ≤ VDD ≤ 3.6 V[1].

Symbol

Parameter

Conditions

Min

Typ[2]

Max

Unit

fosc(RC)

internal RC oscillator frequency

11.88

12.12

MHz

Conditions: Frequency values are typical values. 12 MHz

± 1 % accuracy is guaranteed for

2.7 V

≤ VDD ≤ 3.6 V and Tamb = −40 °C to +85 °C. Variations between parts may cause the IRC to

fall outside the 12 MHz

± 1 % accuracy specification for voltages below 2.7 V.

Fig 21. Internal RC oscillator frequency f versus temperature

temperature (

°C)

−40

−15

002aae987

11.95

12.05

12.15

(MHz)

11.85

VDD = 3.6 V

3.3 V

3.0 V

2.7 V

2.4 V

2.0 V

Table 14.

Dynamic characteristics: Watchdog oscillator

Symbol Parameter

Conditions

Min

Typ[1]

Max

Unit

fosc

internal oscillator frequency

DIVSEL = 0x1F, FREQSEL = 0x1 in the

WDTOSCCTRL register;

[2][3] -7.8

kHz

DIVSEL = 0x00, FREQSEL = 0xF in the

WDTOSCCTRL register

[2][3] -

1700

kHz

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