參數(shù)資料
型號(hào)： ZR36504
廠商： Electronic Theatre Controls, Inc.
英文描述： Video & Audio Interface solution via USB
中文描述： 視頻
文件頁數(shù)： 25/74頁
文件大?。?/td> 298K
代理商： ZR36504
ZORAN Corporation
USBvision II Data Decoder
ZR36505 Data Sheet
November-99
Page 25 of 25
3.
Power Management
In order to meet the USB standard, the ZR36504 should be able to control USB power
supply for the whole device. Two pins of the ZR36504 were dedicated to this task:
PWR_DWN and SUSPND. Both pins are Open-Drain, and active when Hi-Z.
The USB standard requires that soon after a device is hot-connected to the computer, it
should consume no more than 100mA from USB port; After configuration, the device may
consume up to 500mA from the port. Also it is required that in the Suspend mode the
device must not consume more than 0.5mA from the USB port.
The ZR36504 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 get normal power supply in the Power-Down state are the
ZR36504, DRAM, and EEPROM (all these are 3.3v operated).
The SUSPND pin was designed to enable the designer to shut-down any additional
element in the ZR36504 application circuit, which may increase the total current
consumption to more than the USB standard allows (> 0.5mA).
Refer to the ZR36504 Application Notes for an example of how the PWR_DWN and
SUSPND pins should be used, and for the 3.3v supply in application design.
The ZR36504 software driver can control part of the power-management process through
the following registers of the ZR36504:
Parameter
Register
address
SSPND_EN
Reg.0/d1
SSPND_EN
condition as required by USB standard.
1: Suspend state is disabled
PWR_VID
Reg.0/d5
PWR_VID
1: Video/Audio Source is powered ON
RES2
Reg.0/d2
RES2
1: Enable ZR36504 Video Processor and Pipe
circuit (after video source is powered on).
After USB-Reset, the ZR36504 is in its Power Down state (PWR_DWN pin is Hi-Z).
After configuration, software sets PWR_VID bit to '1' to turn on camera circuit
Usage
Enable Suspend state:
0: Default (after Reset). Responds to USB Suspend
Apply USB 5v to Video/Audio Source
0: Default (after Reset). Video/Audio Source is OFF
Restart End-Point #2 (Vid. pipe) in the ZR36504:
0: Default (after Reset). Restart ZR36504 video path.
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