參數(shù)資料
型號(hào)： UDA1326PS
廠商： NXP Semiconductors N.V.
元件分類： Codec
英文描述： USB AUDIO-CODEC(通用串行總線音頻編解碼器)
中文描述： USB音頻編解碼器（通用串行總線音頻編解碼器）
文件頁(yè)數(shù)： 17/43頁(yè)
文件大小： 678K
代理商： UDA1326PS
Philips
Semiconductors, Inc.
USB-CODEC UDA1325PS
Technical Report
DML98022
In the general USB concept the ‘USB-Host’ needs to be notified of all activity in it’s USB topology. This includes
the use of the GPIO pins. For this purpose the USB HID specifications were defined. The HID Entities describe
to the ‘Host’ the type of inputs/outputs that can be controlled.
17
There are two HID concepts /phases defined in the HID entity description. Phase one defines that ‘a(chǎn)ll’ control
parameter changes need to be sent as requests to the Host first. Upon reception it will take action (phase two)
and send a control change request command when e.g. a button was pushed.
Accordingly the action flow after pressing a button
is:
1.
the Device
μ
Controller reports to the Host that a push button has been pressed and what function it
represents,
2.
the Host will initiate the correct request via the correct Class (Audio Device Class or HID), according to the
pressed push button.
The Device
μ
Controller will translate this request into a physical action by e.g. controlling the Volume level.
If you have decided not to use the HID inputs, then the schematic can be reduced as illustrated in fig. 2-9.
22k
22k
D2
D1
+VCC (3.3V)
GP3
GP4
GP5
Figure 2-9
Diode Selections for selecting configuration with NO HID inputs switches.
In such case you will also have to remove all HID related data of your configuration map. This can be realized
with just a few clicks of your mouse. Go to address 0Fh of the editor and select the respective button(s) :
Figure 2-10
Neseccary adjustments for “NO-HID option” within the configuration map.
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