参数资料
型号: MC34827A2EPR2
厂商: Freescale Semiconductor
文件页数: 20/57页
文件大小: 0K
描述: IC USB POWER MANAGER 20-QFN
标准包装: 1
应用: OR 控制器,UART/USB 数据,音频管理
电流 - 电源: 9µA
电源电压: 2.7 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 20-UFQFN 裸露焊盘
供应商设备封装: 20-QFN-EP(3x4)
包装: 标准包装
其它名称: MC34827A2EPR2DKR
FUNCTIONAL DEVICE OPERATION
ACCESSORY IDENTIFICATION
STUCK KEY IDENTIFICATION
When the ADC conversion is finished and the ADC Result
is found to be a value corresponding to a remote control key
of Audio Type 1 cable, a stuck key process flow will be
initiated to find out whether a remote control key is stuck and
to inform the baseband of the stuck key status.
Figure 15 shows the stuck key process flow. If the stuck
key is detected to be released within 1.5 s, the flow will return
to re-start the ID identification flow; Otherwise, a Stuck_Key
Interrupt will be set. When the key is released, a
Stuck_Key_RCV Interrupt will be generated and then the
identification flow will be re-started to find out the ID
resistance of the attached cable.
Start 1.5s timer
Yes
Key
released?
No
1.5s timer
expired?
Yes
Set Stuck_ Key
bit
Key
No
No
released?
Yes
Set Stuck_
Key_RCV bit
Figure 15. The Stuck Key Process Flow Diagram
Table 6. ADC Output vs. Resistor Values (Unit: k Ω )
ADC Result
00000
00001
00010
00011
00100
00101
00110
00111
R ID ( k Ω )
2.00
2.604
3.208
4.014
4.820
6.03
8.03
ADC Result
01000
01001
01010
01011
01100
01101
01110
01111
R ID ( k Ω )
10.03
12.03
14.46
17.26
20.5
24.07
28.7
34.0
ADC Result
10000
10001
10010
10011
10100
10101
10110
10111
R ID ( k Ω )
40.2
49.9
64.9
80.07
102
121
150
200
ADC Result
11000
11001
11010
11011
11100
11101
11110
11111
R ID ( k Ω )
255
301
365
442
523
619
1000
Notes:
15. If the ID resistance is below 1.9 k Ω , the ADC Result is set to 00000.
16. If the ID line is floating, the ADC Result is set to 11111
MC34827
Analog Integrated Circuit Device Data
20
Freescale Semiconductor
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