參數(shù)資料
型號： OMAP5910(RISC)
英文描述： Dual-Core Processor
中文描述： 雙核處理器
文件頁數(shù)： 120/160頁
文件大?。?/td> 1997K
代理商： OMAP5910(RISC)
Electrical Specifications
108
August 2002 Revised August 2003
SPRS197B
5.6
Clock Specifications
This section provides the timing requirements and switching characteristics for the OMAP5910 system clock
signals.
5.6.1 32-kHz Oscillator and Input Clock
The 32.768-kHz clock signal (often abbreviated to 32-kHz) may be supplied by either the on-chip 32-kHz
oscillator (requiring an external crystal) or an external CMOS signal. The state of the CLK32K_CTRL pin
determines which is used.
The on-chip oscillator requires an external 32.768-kHz crystal connected across the OSC32K_IN and
OSC32K_OUT pins. The connection of the required circuit, consisting of the crystal and two load capacitors,
is shown in Figure 52. The load capacitors, C
1
and C
2
, should be chosen such that the equation below is
satisfied (recommended values are C
1
= C
2
= 10 pF). C
L
in the equation is the load specified for the crystal.
All discrete components used to implement the oscillator circuit should be placed as close as possible to the
associated oscillator pins (OSC32K_IN and OSC32K_OUT) and to the V
SS
pin closest to the oscillator pins
(GZG ball V12 or GDY ball F6).
NOTE:
The 32.768-kHz oscillator is powered by the CV
DD
supply. If an external clock source is used instead
of using the on-chip oscillator, care must be taken that the voltage level driven onto the OSC32K_IN and
OSC32K_OUT pins is no greater than the CV
DD
voltage level.
C
L
C
1
C
2
(
C
1
C
2
)
OSC32K_IN
OSC32K_OUT
C1
C2
Crystal
32.768 kHz
VSS
Figure 52. 32-kHz Oscillator External Crystal
Table 52 shows the switching characteristics of the 32-kHz oscillator and Table 53 shows the input
requirements of the 32-kHz clock input.
Table 52. 32-kHz Oscillator Switching Characteristics
PARAMETER
MIN
TYP
MAX
UNIT
Start-up time (from power up until oscillating at stable frequency of 32.768 kHz)
200
800
ms
μ
A
kHz
IDDA, active current consumption
Oscillation frequency
4
32.768
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