STV-USB-VGA-R01 查看數據表（PDF） - STMicroelectronics

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STV-USB-VGA-R01

USB CIF/VGA Digital Camera Chipset

STMicroelectronics 

Customer Datasheet, Rev 3.1, 29 November 2000

STV0672-chipsetf-3-1.fm

2.7 Suspend Mode

Under the control of the SUSPEND pin VV6410/VV6500 can be forced into an ultra low power mode. The sensor will consume

less than 80µA of current while suspended and the STV0672 device will consume approximately 50µA. The total chipset

consumption therefore is approximately 150µA.

The sensor will enter suspend mode when the SUSPEND pin has been driven high. The SUSPEND mode is effectively identical

to a power-on-reset - all the video timing blocks within the sensor are reset as are the contents of the serial interface, therefore

the user will have to perform a compete reconfiguration of the device on exitting SUSPEND.

Mode

Suspend

Description

Approx. Module Current

Camera module in lowest power state. Suspend has

been asserted by host. The clock to sensor has been

removed and all blocks within STV0672 have been

powered down.

c.100µA

Table 2 : STV0672 chipset power consumption

2.8 Still Image Upload and Remote Wake-Up

The present STV0672 reference design includes 2 micro switches, identified as SW1 and SW2. Two special functions are

supported by these switches - image upload via a TWAIN driver and remote wake up of the host.

Presently both of these features will be invoked by depressing SW1. If the camera/host is in standby mode then pressing SW1

will force the system to wake up. Thereafter SW1 will control the uploading of still images to the host. It is important to note that

STV0672 must always be used in tethered mode, attached to a PC, and there is no local memory for image storage.

29 November 2000

Commercial in confidence

11/41

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