LPC18S50 datasheet(105/151 Pages) NXP

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LPC18S50_S30_S10

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Product data sheet

Rev. 1 — 23 February 2015

105 of 151

NXP Semiconductors

LPC18S50/S30/S10

32-bit ARM Cortex-M3 microcontroller

11.3 Crystal oscillator

[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.

[3]

Indicates RMS period jitter.

[4]

PLL-induced jitter is not included.

[5]

Select HF = 0 in the XTAL_OSC_CTRL register.

[6]

Select HF = 1 in the XTAL_OSC_CTRL register.

11.4 IRC oscillator

[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.

11.5 RTC oscillator

[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.

Table 15.

Dynamic characteristic: oscillator

Tamb = 40 C to +85 C; VDD(IO) over specified ranges; 2.2 V  VDD(REG)(3V3)  3.6 V.[1]

Symbol

Parameter

Conditions

Min

Typ[2]

Max

Unit

Low-frequency mode (1 MHz to 20 MHz)[5]

tjit(per)

period jitter time

5 MHz crystal

[3][4] -

13.2

10 MHz crystal

6.6

15 MHz crystal

4.8

High-frequency mode (20 MHz to 25 MHz)[6]

tjit(per)

period jitter time

20 MHz crystal

[3][4] -4.3

25 MHz crystal

3.7

Table 16.

Dynamic characteristic: IRC oscillator

Tamb = 40 C to +85 C; 2.2 V  VDD(REG)(3V3)  3.6 V.[1]

Symbol

Parameter

Conditions

Min

Typ[2]

Max

Unit

fosc(RC)

internal RC oscillator

frequency

11.82

12.0

12.18

MHz

Table 17.

Dynamic characteristic: RTC oscillator

Tamb = 40 C to +85 C; 2.2 V  VDD(REG)(3V3)  3.6 V or 2.2 V  VBAT  3.6 V[1]; typical CRTCX1/2 =

20 pF; also see Section 13.3

Symbol

Parameter

Conditions

Min

Typ[2]

Max

Unit

fi(RTC)

RTC input frequency

32.768

kHz

IDD(RTC)

RTC supply current

280

800

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