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参数资料
| 型号： | MC34827A1EPR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 29/57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
OPERATION AFTER IDENTIFICATION
When AutoPSAVE = 1, if no activity is detected in an
Activity Idle Detection Time window, which is programmed by
the Activity Idle Detection Time bits in the Time Delay
register, the 34827 enters the Power Save mode
automatically to minimize the quiescent current. In the Power
Save mode, the key pressing is monitored as well. The
current to monitor the ID line status is sampled at 5ms period.
Upon detecting the activity in signal switches, the 34827
returns to the Active mode.
When AutoPSAVE = 0, the baseband can control the
mode of 34827 manually by setting the values of Device
Mode register via I 2 C.
The ID detection circuit continues to be on for detaching
detection in the Active mode and samples the ID line every
interval programmed by the Device Wake Up bits in the
Timing Set 1 register in the Power Save mode. When the
ID_FLOAT rising edge is detected, the Detach bit in the
Interrupt 1 register is set to inform the host that the accessory
is detached. Then the 34827 enters the Standby mode.
JIG CABLE
The JIG cable is for test and development purpose. It has
an ID resistance to differentiate it from a regular USB cable,
as shown in Figure 24 . The Jig cable has four ID resistance
values to identify either the Boot-On option is selected and if
the cable is a USB or UART type. The detection result sets
the JIG and the BOOT outputs, where JIG is an open-drain
output and BOOT is a push-pull output
If Manual S/W is set to ‘1’, the relationship between JIG
cable Type and the JIG and BOOT outputs is shown in
If Manual S/W is set to ‘0’, the switches to be turned on are
determined by the value of Manual S/W registers. The
BOOT_SW and JIG_ON bits in Manual S/W 2 register can be
configured to control the JIG and BOOT outputs manually
under this condition. Detailed information can be found in
Table 8. JIG Cable Type and Indications
Device type bit
JIG Output
BOOT Output
JIG_USB_ON
Low-impedance
High Logic
JIG_USB_OFF
Low-impedance
Low Logic
JIG_UART_ON
Low-impedance
High Logic
JIG_UART_OFF
Low-impedance
Low Logic
USB JIG CABLE
With the normal operation setting of the control bits, when
the identified accessory is a USB jig cable, both the D+ to DP
and the D- to DM switches are switched on (see Figure 25 ),
the JIG pin outputs a logic low signal, the power MOSFET is
on, the ISET output is high-impedance. The BOOT output is
dependent on whether or not the BOOT on option. When the
JIG_USB_ON bit in the device type register is set, the BOOT
pin outputs logic high.
When INT_MASK = 0, the switching action of D+ to DP
and the D- to DM switches are controlled by the WAIT bit. If
WAIT = 1, the signal switches will be turned on after a WAIT
time since the INTB outputs low voltage as for other type
accessory. If WAIT = 0, the signal switches won’t be turned
on until the WAIT bit is set to ‘1’ by I 2 C. When INT_MASK =
1, no matter the WAIT is set to ‘0’ or ‘1’, the signal switches
are turned on once the USB jig cable is identified.
Both the ID detector and the VBUS detector monitor the
detachment of the USB jig cable. The ID detection circuit
continues to be on for detachment detection in the Active
mode. When the ID_FLOAT is set, the Detach bit in the
Interrupt 1 register is set to inform the host. When the
VBUS_DET is set to ‘0’, which means either the VBUS power
is removed or the cable is detached, the Detach bit is also set
to inform the host. Then the 34827 moves to the Standby
mode. If the Detach bit is set due to the removing of only
VBUS or only ID resistance and the cable is not detached
completely, the identification flow will be triggered again since
the ID_FLOAT bit or VBUS_DET bit still indicates that an
accessory is connected when the 34827 moves to the
Standby mode. All the signal switches are turned off.
UART JIG CABLE
With the normal operation setting of the control bits, when
the identified accessory is a UART jig cable, both the RxD to
DP and the TxD to DM switches are switched on (see
The BOOT output is dependent on whether or not the BOOT
on option. When the JIG_UART_ON bit in the device type
register is set, the BOOT pin outputs logic high.
When INT_MASK = 0, the switching action of RxD to DP
and the TxD to DM switches are controlled by the WAIT bit. If
WAIT = 1, the signal switches will be turned on after a WAIT
time since the INTB outputs low voltage as for other type
accessory. If WAIT = 0, the signal switches won’t be turned
on until the WAIT bit is set to ‘1’ by I 2 C. When INT_MASK =
1, no matter the WAIT is set to ‘0’ or ‘1’, the signal switches
are turned on once the UART jig cable is identified.
The ID detection comparator continues to be on for
detachment detection in the Active mode. When the
ID_FLOAT is set, the Detach bit in the Interrupt 1 register is
set to inform the host that the accessory is detached. Then
the 34827 enters the Standby mode.
MC34827
Analog Integrated Circuit Device Data
Freescale Semiconductor
29
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