Datasheet

LPC11U1X All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 2.2 — 11 March 2014 46 of 72
NXP Semiconductors
LPC11U1x
32-bit ARM Cortex-M0 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 (T
amb
= 40 C to +85 C) is 40 %.
[3] See the LPC11U1x user manual.
Table 12. Dynamic characteristics: IRC
T
amb
=  40  C to +85  C; 2.7 V  V
DD
 3.6 V
[1]
.
Symbol Parameter Conditions Min Typ
[2]
Max Unit
f
osc(RC)
internal RC oscillator
frequency
- 11.88 12 12.12 MHz
Conditions: Frequency values are typical values. 12 MHz  1 % accuracy is guaranteed for
2.7 V  V
DD
 3.6 V and T
amb
= 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 versus temperature
Table 13. Dynamic characteristics: Watchdog oscillator
Symbol Parameter Conditions Min Typ
[1]
Max Unit
f
osc(int)
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
002aaf403
11.95
12.05
12.15
f
(MHz)
11.85
temperature (°C)
−40 853510 60−15
VDD = 3.6 V
3.3 V
3.0 V
2.7 V
2.4 V
2.0 V