參數(shù)資料
型號(hào)： UDA1326PS
廠商： NXP Semiconductors N.V.
元件分類(lèi)： 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)： 16/43頁(yè)
文件大小： 678K
代理商： UDA1326PS
Philips
Semiconductors, Inc.
USB-CODEC UDA1325PS
Technical Report
DML98022
16
2.1.4 Diode Selection
The schematic in fig. 2-8 gives the circuit for selecting a configuration via diodes in combination with two HID-
input switches. If you want to implement the Connect / Disconnect functionality into your application (which we
strongly recommend), you can use the schematic presented in the latest application board schematic or see the
respective datasheet (UDA1325.PDF) on page 44 to start with.
22k
22k
47k
47k
T2
T1
D2
D1
HID in 2
HID in 1
+VCC (3.3V)
GP3
GP4
GP5
47k
+VCC (3.3V)
Figure 2-8
Circuit for selecting a configuration map in combination with 2 HID inputs.
At initialization phase (GP5 low), both transistors are not conducting and it is not possible to read in a wrong
diode value by (accidently or by purpose) pressing one or two of the external function (HID) buttons. After
initialization the transistors are conducting. Including an optional additional diode requires another additional
transistor:
Configuration map
Number
Diode #
Comment
level during
initialization
GP3
GP4
0
--
No diodes or transistors needed
high
high
1
D1
Transistor T1 needed
low
high
2
D2
Transistor T2 needed
high
low
3
D1 and D2
Both transistors needed
low
low
Table 2-5
Diode Selections
Note:
If no HID is used in the specific option or a wrong selection doesn’t matter, the transistors are not needed.
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