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參數資料
| 型號： | ZR36506 |
| 英文描述： | Fast Recovery Rectifier Diodes |
| 中文描述： | 外圍芯片 |
| 文件頁數： | 41/99頁 |
| 文件大?。?/td> | 452K |
| 代理商： | ZR36506 |
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Zoran ZR 36506 USBV ision – Datasheet
Zoran Proprietary and Confidential
Pow er Manag ement
7 -1
7
P
OW ER
M
ANAGEMENT
To meet USB standard requirements, the ZR36506 must be able to control USB power supply
for the entire device implemented around it. Two pins of the ZR36506 were dedicated to this
task: PWR_DWN and SUSPND. Both pins are Open-Drain, and active when High-z.
The USB standard requires that once a device is hot-connected, it must consume no more than
100 mA from the USB port. After configuration, the device may consume up to 500 mA.
Additionally, the device must not consume more than 0.5 mA in Suspend mode.
The ZR36506 uses its power management pins as follows:
§
The PWR_DWN pin was designed to switch the USB 5v source to the video/audio source
circuit (CCD, DSP, ADC,
μ
-Controller, Video-Decoder, audio CODEC, etc.). The only ICs
that continue to receive normal power supply in the Power-Down state are the ZR36506,
SDRAM, and EEPROM (all ICs operate on 3.3 V).
§
The SUSPND pin was designed to enable the designer to shut down any additional element
in the ZR36506 application circuit, which may increase the total current consumption to
more than the USB standard allows (> 0.5 mA).
Refer to the ZR36506 Application Notes for an example of how the PWR_DWN and SUSPND
pins should be used, and for the 3.3 V supply in application design.
The ZR36506 software driver can control part of the power-management process through the
following registers on the ZR36506:
Parameter
Register
Address
Usage
SSPND_EN
Reg.0/d1
SSPND_EN
Enable Suspend state:
0:
Default (after Reset). Responds to
USB Suspend condition as required
by USB standard.
1:
Suspend state is disabled.
PWR_VID
Reg.0/d5
PWR_VID
Apply USB 5 V to Video/Audio Source
0:
Default (after Reset). Video/Audio
Source is OFF.
1:
Video/Audio Source is powered ON.
RES2
Reg.0/d2
RES2
Restart End-Point #2 (Video pipe) in the
ZR36506:
0:
Default (after Reset). Restart
ZR36506 video path.
1:
Enable ZR36506 Video Processor
and Pipe circuit (after video source is
powered on).
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