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NXP Semiconductors
10.3 Internal oscillators
Table 10. Dynamic characteristic: internal oscillators
T amb = ? 40 ° C to +85 ° C; 2.7 V ≤ V DD ≤ 3.6 V. [1]
LPC11C12/C14
Symbol
Parameter
Conditions
Min
Typ [2]
Max
Unit
f osc(RC)
internal RC oscillator frequency -
11.88
12
12.12
MHz
[1]
[2]
Parameters are valid over operating temperature range unless otherwise specified.
Typical ratings are not guaranteed. The values listed are at room temperature (25 ° C), nominal supply
voltages.
12.15
f
(MHz)
12.05
VDD = 3.6 V
3.3 V
3.0 V
2.7 V
002aaf403
2.4 V
2.0 V
11.95
11.85
? 40
? 15
10
35
60 85
temperature ( ° C)
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 18. Internal RC oscillator frequency vs. temperature
Table 11.
Dynamic characteristics: Watchdog oscillator
Symbol Parameter
Conditions
Min
Typ [1]
Max
Unit
f osc
internal oscillator DIVSEL = 0x1F, FREQSEL = 0x1
[2][3]
-
7.8
-
kHz
frequency
in the WDTOSCCTRL register;
DIVSEL = 0x00, FREQSEL = 0xF
[2][3]
-
1700
-
kHz
in the WDTOSCCTRL register
[1]
[2]
[3]
Typical ratings are not guaranteed. The values listed are at room temperature (25 ° C), nominal supply
voltages.
The typical frequency spread over processing and temperature (T amb = ? 40 ° C to +85 ° C) is ± 40 %.
See the LPC11Cx user manual.
LPC11C12_C14_0
Preliminary data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 00.05 — 23 April 2010
? NXP B.V. 2010. All rights reserved.
35 of 49
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