參數(shù)資料
型號： TUSB3410VF
英文描述： BUS CONTROLLER
中文描述： 總線控制器
文件頁數(shù)： 89/92頁
文件大?。?/td> 317K
代理商： TUSB3410VF
13
–
1
13 Application Notes
13.1 Crystal Selection
The TUSB3410 requires a 12-MHz clock source to work properly. This clock source can be a crystal placed across
the X1 and X2 terminals. A parallel resonant crystal is recommended. Most parallel resonant crystals are specified
at a frequency with a load capacitance of 18 pF. This load can be realized by placing 33-pF capacitors from each end
of the crystal to ground. Together with the input capacitance of the TUSB3410 and stray board capacitance, this
provides close to two 36-pF capacitors in series to emulate the 18-pF load requirement. Note, that when using a
crystal, it takes about 2 ms after power up for a stable clock to be produced.
TUSB3410
X1
33 pF
12 MHz
X2
33 pF
Figure 13
–
1. Crystal Selection
13.2 External Circuit Required for Reliable Bus Powered Suspend Operation
TI has found a potential problem with the action of the SUSPEND output pin immediately after power on. In some
cases the SUSPEND pin can power up asserted high. When used in a bus powered application this can cause a
problem because the VREGEN# input is usually connected to the SUSPEND output. This in turn causes the internal
1.8-V voltage regulator to shut down, which means an external crystal may not have time to begin oscillating, thus
the device will not initialize itself correctly.
TI has determined an on-chip fix for this problem, but has not determined a schedule on when the fix will be
implemented. In the meantime, the components R2 and D1 (rated to 25 mA) in the circuit shown below can be used
as a workaround. Note that R1 and C1 are required components for proper reset operation, unless the reset signal
is provided by another means. R2 and D1 can be left in place or removed once the silicon is modified.
Note that use of an external oscillator (1.8-V output) versus a crystal would avoid this situation, but it is not expected
that many applications would use an oscillator. Also note that self-powered applications would probably not see this
problem because the VREGEN# input would likely be tied low, enabling the internal 1.8-V regulator at all times.
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