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WM8321 bảng dữ liệu(PDF) 48 Page - Wolfson Microelectronics plc

tên linh kiện WM8321
Giải thích chi tiết về linh kiện  Processor Power Management Subsystem
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WM8321 bảng dữ liệu(HTML) 48 Page - Wolfson Microelectronics plc

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WM8321
Production Data
w
PD, February 2012, Rev 4.0
48
13.3 CRYSTAL OSCILLATOR CONNECTIONS
The crystal oscillator generates a 32.768kHz reference clock, which is used to provide reference
clock for the Real Time Clock (RTC) in the WM8321. The oscillator requires an external crystal on the
XTI and XTO pins, as well as two capacitors, connected as shown in Figure 17.
XTO
WM8321
Crystal Oscillator
XTI
C1
C2
32kHz
Cp
Cxt
Lxt
Rxt
Crystal Model
XOSCGND
Figure 17 Crystal Oscillator
A suitable crystal oscillator should be selected in accordance with the following requirements:
PARAMETER
MIN
MAX
UNITS
Nominal frequency
32.768
kHz
Series resistance
50
70
k
Maximum driving level
0.5
W
Table 18 Selection of Crystal Oscillator Component
The load capacitors C1 and C2 should be selected according to the recommended load capacitance,
CL of the crystal, which is given by the following equation:
Assuming C1 = C2 and CSTRAY = 2.75pF (typical pad i/o capacitance), then:
C1 = C2 = 2 x (CL - 2.75pF).
For example, if the crystal has a load capacitance CL = 9pF, then C1 = C2 = 12.5pF.
If a suitable 32.768kHz clock is already present elsewhere in the system, it is possible for the
WM8321 to use that external clock instead. The external clock should be applied to pin XTI, and the
XTO pin left floating in this case.



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