VV6444 datasheet(33/60 Pages) STMICROELECTRONICS

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STV0680A + VV6444/6410/6500

Digital Camera Chipset; Customer Datasheet, Rev 3.0, March 2000

PRELIMINARY

CDSTV0680F-C

Commercial in confidence

STV0680F_contents.fm

7.5.2

Using VV6410/6500 (sensor operates at @ 3.3V DC)

Notes:

1. See Table 11 on page page 26. However, STV0680A mean current consumption is to be determined by measurement of

sample quantity in due course.

2. From limited evaluation, typical self-refresh current figures of certain SDRAM chips are well below manufacturers’ maximum

specification, e.g. 100-250

µA. See Section 9. for recommendations.

3. Sensor suspend mode current <100

µA when SUSPEND pin asserted, see Table 18 and Table 19.

4. If the appropriate hardware to assert the sensor SUSPEND pin is not fitted, an addditional current consumption in this mode

of up to 200

µA can be expected.

Mode

Typical

Comments

’Snapshot’/Continuous/

Self timer mode (while

un-tethered)

60mA

Assuming appropriate hardware included, power is sourced from PC

while USB connected.

’Snapshot’/Continuous/

Self timer mode (while

tethered to PC)

60mA

Standby Mode (when

NOT connected to USB):

Sensor SUSPEND pin

asserted (see note 4)

Approx. 0.5mA +

SDRAM self-

refresh current (see

note 2)

Total current in this mode equals:

STV0680A Standby current consumption (see note 1)

+ SDRAM self-refresh current (see note 2)

+ peripheral circuitry (approx. 50

µA).

+ Sensor suspend mode current (See note 3)

PC Suspend mode

(when connected to

USB): Sensor SUSPEND

pin asserted (see note 4)

Approx. 0.7mA +

SDRAM self-

refresh current (see

note 2)

Total current in this mode equals:

STV0680A Standby current consumption (see note 1)

+SDRAM self-refresh current (see note 2)

+ peripheral circuitry (approx. 50

µA).

+ 200

µA , based on 1.5k pull-up in camera (see Section 9.) and 15k

pull-down in PC.

+ Sensor suspend mode current (See note 3)

Table 22 : Current consumption, complete STV0680A+VV6410/6500 camera

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