LPC11C12FBD48 NXP Semiconductors, LPC11C12FBD48 Datasheet - Page 51

• Manufacturer Part Number: LPC11C12FBD48
• Description: The LPC11C12FBD48 is an ARM Cortex-M0 microcontroller designed for 8/16-bit microcontroller applications, offering performance, low power, simple instruction set and memory addressing together with reduced code size compared to existing 8/16-bit arch
• Manufacturer: NXP Semiconductors

NXP Semiconductors
LPC11CX2_CX4
Product data sheet
11.3 XTAL Printed Circuit Board (PCB) layout guidelines
Table 19.
Table 20.
The crystal should be connected on the PCB as close as possible to the oscillator input
and output pins of the chip. Take care that the load capacitors C
third overtone crystal usage have a common ground plane. The external components
must also be connected to the ground plain. Loops must be made as small as possible in
Fundamental oscillation
frequency F
Fundamental oscillation
frequency F
15 MHz - 20 MHz
5 MHz - 10 MHz
10 MHz - 15 MHz
15 MHz - 20 MHz
20 MHz - 25 MHz
1 MHz - 5 MHz
Fig 24. Oscillator modes and models: oscillation mode of operation and external crystal
model used for C
Recommended values for C
components parameters) low frequency mode
Recommended values for C
components parameters) high frequency mode
OSC
OSC
All information provided in this document is subject to legal disclaimers.
XTALIN
C X1
LPC1xxx
Rev. 3 — 27 June 2011
XTAL
X1
Crystal load
capacitance C
10 pF
20 pF
30 pF
10 pF
20 pF
30 pF
10 pF
20 pF
10 pF
Crystal load
capacitance C
10 pF
20 pF
10 pF
20 pF
/C
X2
XTALOUT
evaluation
C X2
X1
X1
/C
/C
L
L
X2
X2
in oscillation mode (crystal and external
in oscillation mode (crystal and external
Maximum crystal
series resistance R
< 300 
< 300 
< 300 
< 300 
< 200 
< 100 
< 160 
< 60 
< 80 
Maximum crystal
series resistance R
< 180 
< 100 
< 160 
< 80 
32-bit ARM Cortex-M0 microcontroller
=
LPC11Cx2/Cx4
x1
S
S
, C
L
C L
R S
x2
External load
capacitors C
18 pF, 18 pF
39 pF, 39 pF
57 pF, 57 pF
18 pF, 18 pF
39 pF, 39 pF
57 pF, 57 pF
18 pF, 18 pF
39 pF, 39 pF
18 pF, 18 pF
External load
capacitors C
18 pF, 18 pF
39 pF, 39 pF
18 pF, 18 pF
39 pF, 39 pF
002aaf424
, and C
© NXP B.V. 2011. All rights reserved.
C P
x3
in case of
X1
X1
, C
, C
51 of 62
X2
X2