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参数资料
| 型号： | MC34827A2EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 19/57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 |
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FUNCTIONAL DEVICE OPERATION
ACCESSORY IDENTIFICATION
.
Power Down
No
Power
VBUS Power
VBUS_DET?
Yes
Startup
delay
No
ISET = high
No
V DD > V POR ?
No
impedance
Yes
Yes
V DD > V POR ?
Power FET on
Reset
VBUS_DET?
No
Yes
Active
Standby
Yes
ID_FLOAT?
No
R ID < 100 ?
No
Yes
Detection
Delay
ADC = 00000
No
ID_FLOAT?
No
ID_DET_EN
D?
Yes
Yes
DP
0.6V
DM > 0.8V
Yes
(Identification
Flow)
Start ADC to
measure R ID
R ID = Video
Yes
R ID = 75 ?
Yes
No
USB-OTG
Video cable?
Yes
A/V_CHG = 1
No
No
DM < 0.4V?
No
Yes
cable?
No
No
ID_FLOAT
Yes
DM
0.6V
ID_FLOAT?
Yes
USB host
UART jig
cable w/
boot option
UART jig
cable w/o
boot option
Phone
Powered
Device
Ye s R ID = UART
jig w/ boot?
No
Ye s R ID = UART
jig w/o boot?
No
Yes R ID =
102k ?
No
Audio
Type 1
TTY
Converter
UART
Cable
Yes
Yes
Yes
Video
cable
R ID = Audio
Type 1 ?
No
R ID = TTY
Converter?
No
R ID = UART
Cable?
No
ID_DET_EN
D?
Yes
R ID =
440k ?
No
R ID =
200k ?
No
No
Yes
Yes
Dedicated
Charger
5-Wire
Charger
No
DP < 0.4V?
Yes
USB
Charger
No
ID_DET_EN
D?
Yes
R ID = USB
jig w/ Boot?
No
R ID = USB
jig w/o Boot?
No
Yes
Yes
USB jig
cable w/
boot option
USB jig
cable w/o
boot option
Audio
Type2
Cable
Stuck Key
Process
Yes
Yes
R ID = Audio
Type2
Cable?
No
R ID = remote
key?
No
No
Unknown
Figure 14. Detailed Accessory Identification Flow Diagram
RID IDENTIFICATION
A comparator monitors the ID pin impedance to ground.
When a resistor less than 1.0 M Ω is connected between the
ID line and the ground, the ID_FLOAT bit in the FSL Status 1
register will be set to 0; when the resistor is removed,
ID_FLOAT bit will be set to 1. A falling-edge of this bit starts
the identification flow and a rising-edge of this bit starts the
detachment detection flow.
A signal, ID_DET_END, is used to indicate the end of the
identification.
ID ADC
After the ID_FLOAT bit is set to 0, the identification flow is
started, and an ADC_EN signal is set to enable an ADC
resistance. The ADC is also used to identify what button is
pressed in a cord remote control when the attached
accessory is Audio Type 1 cable. The ADC allows 32 levels
for the ID resistance measurement and can accurately
convert a 1% resistor value to a 5-bit result. The ADC outputs
When the conversion completes, an ADC_STATUS bit is
set and the ADC result value is sent to the ADC Result
register. The ADC_EN signal is cleared automatically after
the conversion finishes.
If the ID resistance is below 2.0 k Ω , the ADC Result is set
to 00000. If the ID line is floating, the ADC Result is set to
11111.
conversion. A 5-bit ID ADC is used to measure the ID
MC34827
Analog Integrated Circuit Device Data
Freescale Semiconductor
19
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