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參數(shù)資料
| 型號： | UPD720130GC-9EU-SIN |
| 廠商： | NEC Corp. |
| 英文描述： | USB2.0 to IDE Bridge |
| 中文描述： | USB2.0轉(zhuǎn)IDE橋 |
| 文件頁數(shù)： | 14/44頁 |
| 文件大?。?/td> | 316K |
| 代理商： | UPD720130GC-9EU-SIN |
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Data Sheet S16302EJ3V0DS
14
μ
PD720130
To realize bus-powered USB2.0 to IDE Bridge system, the power consumption for IDE device should be
controlled by the power state of the
μ
PD720130. The
μ
PD720130 has DPC pin to control IDE device
’
s power
circuit. DPC pin
’
s output level relates to USB device states. DPC should be pull up to 3.3 V because DPC
output becomes high impedance state until the
μ
PD720130 is initialized.
Figure 2-4. DPC Pin to Control IDE Device
’
s Power Circuit
DPC
Power ON
Hardware Reset
Bus Reset
Set
Configuration
Un-configured
Default
Configured
Suspend
Occured
Resume
Occured
Suspend
Configured
Normal
Operation
Normal
Operation
High impedance state
Following reference circuit can cut off power supply to IDE device during the
μ
PD720130 is under default
and un-configured state. Also, the power supply to IDE device is disabled during suspend state, too.
Power consumption of total system under default, un-configured, and suspend state can be reduced by
DPC pin.
Figure 2-5. Power Control Circuit Example
P-Channel Switch
ON
Pull
Up
3.3 V
IN
OUT
Regulator
Power supply rail
IDE Device
Power
DPC
PD720130
μ
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