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参数资料
| 型号： | MC34827A2EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 24/57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
OPERATION AFTER IDENTIFICATION
Accessory
attaching
Device Type
ATTACH
WAIT
Switching
ID time
Wait time
(A). WAIT = 1 when the ATTACH interrupt is generated. (VDDIO is high and INT_MASK = 1.)
Accessory
attaching
Device Type
ID time
ATTACH
WAIT
Switching
(B). WAIT = 0 when the ATTACH interrupt is generated. (VDDIO is high and INT_MASK = 1.)
Figure 19. Operating Waveforms of the WAIT Bit
AUTOMATIC SWITCHING OR MANUAL
SWITCHING (SWITCH_OPEN & MANUAL S/W BITS)
When a supported accessory is identified, the default
behavior of 34827 is to automatically turn on the
corresponding signal switches. The user can also choose to
turn on optional signal switches manually. How to turn on the
switches is controlled by the Manual S/W bit and the
Switch_Open bits in the Control register.
If the Switch_Open bit is ‘0’, all switches are off, including
the power MOSFET.
If Manual S/W = 1, which is its reset value, the switches to
be turned on and the outputs of ISET, JIG and BOOT pins are
determined automatically by the Device Mode register, that is
the identification result. If Manual S/W = 0, the switches to be
turned on and the outputs of ISET, JIG and BOOT pins are
determined by the values of the Manual S/W register. The
relationship between the values of the Manual S/W register
and the switches to be turned on can be found in Register
Map section.
The values of Switch_Open and Manual S/W bits will not
affect the identification flow and the timing of signal switching
action of the 34827. The difference between Manual S/W = 1
and Manual S/W = 0 is what switches are turned on and what
the ISET, JIG and BOOT pins output when an accessory is
attached. In both way, no switches are turned on in Standby
mode. If the Manual S/W bit is changed from ‘1’ to ‘0’ while an
accessory is attached, the already automatically turned on
switches will be turned off, the switches selected manually
will be turned on, and the status of the ISET, JIG and BOOT
pins will be determined by the corresponding bit value in the
Manual S/W 2 register. However, writing Manual S/W bit back
to ‘1’ in Active mode will not change the switches status and
the outputs.
RAW DATA (RAW DATA BIT)
The RAW DATA bit functions only when the accessory is
Audio Type 1, which supports the remote control key. The
RAW DATA bit determines whether to report the ID pin
resistance change to the baseband when any key is pressed.
When RAW DATA = 1, the ADC is enabled only when an ID
line event is detected, such as when a key is pressed. In this
case, the interrupt bits KP, LKP or LKR and the
corresponding button bits in Button 1 and Button 2 registers
will be set accordingly. Detailed behavior information when
DATA = 0, the ADC is enabled periodically to calculate the ID
line resistance. Any change of ADC Result will set the
ADC_Change interrupt bit to inform the baseband. Then the
baseband can read the ADC Result via I 2 C. The KP, LKP or
LKR and the button bits will not set when RAW DATA = 0.
MC34827
Analog Integrated Circuit Device Data
24
Freescale Semiconductor
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