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參數(shù)資料
| 型號： | W9968CF |
| 英文描述： | Digital Camera |
| 中文描述： | 數(shù)碼相機 |
| 文件頁數(shù)： | 35/78頁 |
| 文件大?。?/td> | 814K |
| 代理商： | W9968CF |
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W9968CF
Publication Release Date: May 1999
- 35 - Revision A2
7.6 Power Management
The W9968CF provides three output pins as described below for the video camera power management
to meet the USB specification requirements.
PWRDWN/PWRDWN#
: These pins, when active, are used to turn off the USB 5V power
supply to the video source circuits (CCD/CMOS sensor device, ADC, DSP, video decoder,
etc.).
SUSPND
: This pin, when active, is used to turn off the 3.3V power supply to the W9968CF
(excluding USBVDD pin, the power supply for the transceiver), DRAM, and E
2
PROM.
Bit 10 of the Miscellaneous Control register (CR00) determines whether the W9968CF-based device is
a high power device or a low power device as described below:
CR00_10 = 1
: High power, bus-powered devices. They must draw no more than 100 mA
upon power up and may draw up to 500 mA after being configured.
CR00_10 = 0
: Low power, bus-powered devices. May draw up to 100 mA from their upstream
connection to allow the interface to function when the remainder of the hub is powered down.
7.6.1 W9968CF Reset
The W9968CF has two reset sources: system reset from the input RSTIN# pin, and the USB reset
detected by seeing a single-ended zero (SE0) for more than 2.5 us. All reset sources are joined inside
the W9968CF into a single reset signal which initializes the W9968CF and is also output via the
RSTOUT pin to initialize other external circuits.
Reset can wake the W9968CF from the suspended mode (SUSPND is inactive low) and turn off the
USB 5V power supply to the video source circuits (PWRDWN is active high and PWRDWN# is active
low).
7.6.2 Before Configured
Before configured, the W9968CF should be reset and keep PWRDWN and PWRDWN# to be active
(CR00_4 = 0) such that the W9968CF-based devices will not draw more than 100 mA from the USB
bus power supply. It is required that an external power-on reset should be applied to the RSTIN# pin
before any USB transaction is sent to the W9968CF by the host.
7.6.3 After Configured
After configured, PWRDWN and PWRDWN# pins should be inactive by programming the Camera
Power-on Control register to one (CR00_4 = 1) to enable device functions. The W9968CF-based
devices must draw less than 100 mA (CR00_10 = 0) or 500 mA (CR00_10 = 1) from the bus during
normal operation. The SOF (Start of Frame) packet is guaranteed to occur once a frame to keep full
speed devices awake during normal bus operation.
7.6.4 Suspend
The W9968CF goes into the suspend mode from any powered state when it sees a constant idle state
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