LH7A400_N NXP Semiconductors, LH7A400_N Datasheet - Page 56

• Manufacturer Part Number: LH7A400_N
• Description: The LH7A400, powered by an ARM922T, is a completeSystem-on-Chip with a high level of integration tosatisfy a wide range of requirements and expectations
• Manufacturer: NXP Semiconductors

LH7A400
56
NOTES:
1. Y1 is a parallel-resonant type crystal. (See table)
2. The nominal values for C1 and C2 shown are for
3. The values for C1 and C2 are dependent upon
4. R1 must be in the circuit.
5. Ground connections should be short and return
6. Tolerance for R1, C1, C2 is ≤ 5%.
a crystal specified at 12.5 pF load capacitance (CL).
the cystal's specified load capacitance and PCB
stray capacitance.
to the ground plane which is connected to the
processor's core ground pins.
Figure 45. 32.768 kHz External Oscillator Components and Schematic
INTERNAL TO
THE LH7A400
EXTERNAL TO
THE LH7A400
Rev. 01 — 16 July 2007
NXP Semiconductors
ENABLE
XTALIN
RECOMMENDED CRYSTAL SPECIFICATIONS
PARAMETER
32.768 kHz Crystal
Tolerance
Aging
Load Capacitance
ESR (MAX.)
Drive Level
Recommended Part
C1
15 pF
GND
32.768 kHz
18 MΩ
R1
Y1
XTALOUT
DESCRIPTION
Parallel Mode
±30 ppm
±3 ppm
12.5 pF
50 kΩ
1.0 µW (MAX.)
MTRON SX1555 or equivalent
C2
18 pF
GND
32-Bit System-on-Chip
Preliminary data sheet
LH7A400-187