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| 型号： | MC34827A1EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 17/57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
POWER-UP
Power Save mode to minimize the operating current when
Audio Type 1 or TTY accessory is attached but not used. For
example, when the Audio Type 1 accessory is attached and
the cell phone is not in audio playing mode, the baseband can
move the 34827 to the Power Save mode via the I 2 C
programming. The 34827 can also automatically switch to
Power Save mode when no activity is detected on the SPK_R
or SPK_L pins for a period which can be programmed by the
Activity Idle Detection Time bits in Timing Set 1 register. The
power consumption in Power Save mode approximates that
in Standby mode.
The 34827 can quit the Power Save mode to Active mode
by I 2 C programming or automatically when detecting signal
activity. The configuration of the 34827 before switching to
the Power Save mode is resumed. The mode can also be
VDD, or a hardware reset of VDDIO input, or a hardware
reset of I 2 C inputs occurs, and it will be cleared when it is read
by I 2 C. The ACTIVE bit and the PSAVE bit together indicate
the device mode according to the relationship shown in
are not powered up.
The ACTIVE bit and PSAVE bit are of R/W type. The
baseband can move the device mode to Standby mode
manually by writing 0x00 to the Device Mode register via I 2 C.
If an accessory is still attached during the operation, the
accessory identification flow shown in Figure 14 can be re-
started.
Table 5. The Device Modes vs. the Register Bits
changed from Power Save mode directly to Standby mode
due to the accessory detachment.
DEVICE MODE REGISTER
The PSAVE bit, ACTIVE bit and RST bit in Device Mode
register hold the information of the device operational mode.
The RST bit, which is of R/C type, indicates whether a reset
PSAVE
0
0
1
1
ACTIVE
0
1
1
0
MODE
Standby
Active
Power Save
Undefined
has occurred. The RST is set when a Power-on Reset of
POWER-UP
The 34827 has four possible power-up scenarios
depending on which of the VDD and the VBUS is powered
first. The four scenarios correspond to the following four
mode transitions (refer to Figure 14 ):
1. From Power Down to VBUS Power: VBUS is
powered up when V VDD < V VDDPOR (VDD POR
threshold)
2. From VBUS Power to Standby: VBUS is already
powered when the VDD rises above its POR threshold
3. From Power Down to Standby: VDD is powered up
when V VBUS < V VBUSPOR (VBUS POR threshold)
4. From Standby to Active: VDD is already powered
when VBUS rises above its POR threshold
SCENARIO 1: VDD = 0 V AND VBUS IS POWERED
UP (POWER DOWN MODE TO VBUS POWER
MODE TRANSITION)
If VDD is not powered but the VBUS is powered up to a
voltage range between the POR threshold and the OVP
threshold, the internal charge pump for the power MOSFET
gate driver starts to operate, softly turning on the power
MOSFET. The IC is in the VBUS Power mode.
In this case, the ISET outputs high-impedance, all
registers are in reset states.
SCENARIO 2: VBUS = HIGH AND VDD IS
POWERED UP (VBUS POWER MODE TO STANDBY
MODE TRANSITION)
If the VBUS is already powered up, when VDD is powered,
the device moves from the VBUS Power mode to the Standby
mode and then quickly move to the VBUS detection flow of
the Active mode to identify the accessory, as shown in
After VDD is powered up, the 34827 starts up the internal
supplies. The POR resets all register bits. The power
MOSFET remains on during the reset process.
SCENARIO 3: VBUS = 0 V AND VDD IS POWERED
UP (POWER DOWN MODE TO STANDBY MODE
TRANSITION)
If no accessory is plugged, when VDD is powered, the
34827 moves from the Power Down mode to the Standby
mode. The internal supplies are started up first, and then the
whole chip is reset and is ready to accept accessories. When
an accessory is attached, the 34827 enters the Active mode.
The power MOSFET is off in this case since VBUS = 0 V.
SCENARIO 4: VDD = HIGH AND VBUS IS
POWERED UP (STANDBY TO ACTIVE MODE
TRANSITION)
This is a normal VBUS detection case.
MC34827
Analog Integrated Circuit Device Data
Freescale Semiconductor
17
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