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| 型号： | MC34827A1EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 21/57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 裸露焊盘（3x3） |
| 包装： | 标准包装 |
| 其它名称： | MC34827A1EPR2DKR |
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FUNCTIONAL DEVICE OPERATION
ACCESSORY IDENTIFICATION
POWER SUPPLY TYPE IDENTIFICATION
The PSTI (Power Supply Type Identification) circuit is used
in Active mode to identify the type of the connected power
supply. The supported power supply should be compliant with
the USB Battery Charging Specification Revision 1.1. The
PSTI circuit first detects whether the DP and DM pins are
short. If the DP and DM pins are found to be short, the PSTI
circuit will continue to find out whether DP and DM are
forward short or reverse short. The detection result together
with the ID detection result is used to determine what
powered accessory is connected.
The PSTI circuit is shown in Figure 16 . Its operation is
described as follows.
When the 34827 detects that the VBUS_DET bit is set, the
PSTI identification flow starts.
1. Wait for a Detection Delay td (programmable in the
Time Delay register).
2. During t D , check to see whether ID_FLOAT = 0. If yes,
then wait for the ID_DET_END to be set and check
whether the attached is an A/V cable.
3. If the result is an A/V cable, set the A/V_CHG and
ATTACH interrupt bits as well as the A/V bit in Device
Type register to inform the baseband and finish the
identification flow. If not, go to step 4.
4. Enable the PSTI (PSTI_EN set to ‘1’) at t 1 . When
PSTI_EN rises, the switch SW1 is turned on to drive
the data source voltage, V DAT_SRC , to DP line. In the
meantime, switch SW2 is turned on so the current
source, I DAT_SINK , sinks a current from the DM line. At
t 2 , the PSTI starts to compare the DM line voltage with
VBUS
references V DAT_REF and V CR_REF . If the DM line
voltage stays above V DAT_REF but below V CR_REF for
20 ms continuously before t 4 , which means that the DP
and DM pins are short, the DP/DM_short signal is set
to ‘1’ at t 3 , and go to step 5. If the DP and DM are not
short, the VBUS detection completes at t 4 and the
VBUS_DET_END is set to ‘1’. Then the state machine
will go to step 6 to find out the type of accessory based
on the DM voltage.
5. The state machine checks if the ID pin is floating. If the
ID pin is not floating at t 3 , the PSTI circuit turns off SW1
and SW2 and the VBUS detection completes. The
VBUS_DET_END is set to ‘1’ and the state machine
goes to step 6. If the ID pin is floating at t 3 , the PSTI
circuit turns off SW1 and SW2 and then turns on SW3
and SW4 to force V DAT_SRC to the DM pin. If the DP
pin is between the two thresholds V DAT_REF and
V CR_REF for 20 ms continuously before t 6 , it means that
the DP and DM pins are reverse short, then the DP/
DM_reverse_short is set to ‘1’ at t 5 , and the SW3 and
SW4 are turned off, VBUS_DET_END is set to ‘1’, and
the state machine goes to step 6. If the DP and DM are
not reverse short, the VBUS detection completes at t 6 ,
SW3 and SW4 are turned off, the VBUS_DET_END is
set to ‘1’, and the state machine goes to step 6.
6. The state machine will make a decision of the attached
accessory based on the ID identification and the VBUS
identification results.
VB
REG
OSC
PSTI_EN
V DAT_SRC
DP
SW1
SW3
To SW1 & 2
IDE
DM
SW2
SW4
To SW3 & 4
Logic
I DAT_SINK
GND
V DAT_REF
CMP1
ISET
CHG_DET
V CR_REF
CMP2
Figure 16. Power Supply Type Identification Circuit Block Diagram
MC34827
Analog Integrated Circuit Device Data
Freescale Semiconductor
21
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相关代理商/技术参数 |
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|---|---|
| MC34827A2EPR2 | 功能描述:USB 接口集成电路 MINI USB IC RoHS:否 制造商:Cypress Semiconductor 产品:USB 2.0 数据速率: 接口类型:SPI 工作电源电压:3.15 V to 3.45 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:WLCSP-20 |
| MC34829 | 制造商:SPC Multicomp 功能描述:CONNECTOR FPC SMD 0.5MM 20WAY |
| MC3482BL | 制造商:Motorola Inc 功能描述: |
| MC34831 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL SMT 7WAY 制造商:SPC Multicomp 功能描述:HEADER, VERTICAL, SMT, 7WAY 制造商:SPC Multicomp 功能描述:WIRE-BOARD CONNECTOR HEADER 7POS, 1.25MM; Connector Type:Wire to Board; Series:1251S; Contact Termination:Surface Mount Vertical; Gender:Header; No. of Contacts:7; No. of Rows:1; Pitch Spacing:1.25mm; Contact Plating:Tin ;RoHS Compliant: Yes |
| MC34833 | 制造商:SPC Multicomp 功能描述:HEADER VERTICAL SMT 11WAY |
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