STV0680 datasheet(33/63 Pages) STMICROELECTRONICS

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STV0680B + VV6444/6410/6500

Detailed chipset specifications

6.5

Typical current consumption of complete camera

The following data assumes that the camera has been built according to reference design referred

to in

Chapter 6 Figures are approximate and depend on actual components sources - see notes.

6.5.1

Using VV6444 (sensor operates at @ 5V DC)

Note: 1 See Table 10 fin Section 6.2

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 4 for recommendations.

3 This is assuming a low quiescent current 3v3 VReg is used, and assuming that the sensor is

switched off using external circuitry.

Mode

Typical Current Cons.

Comments

’Snapshot’/Continuous/Self

timer mode (while un-teth-

ered)

80mA

’Snapshot’/Continuous/Self

timer mode (while tethered

to PC)

80mA

Assuming appropriate hardware included, power is sourced

from PC while USB connected.

Camera stand-by mode

(when NOT connected to

USB)

Approx. 220µA + SDRAM

self-refresh current (see

Note 2)

Total current in this mode equals:

STV0680/680A Standby current consumption (see

Note 1)

+ SDRAM self-refresh current (see

Note 2)

+ peripheral circuitry (approx. 50

µA, see Note 3).

Suspend mode

(when connected to USB)

Approx. 80µA + SDRAM

self-refresh current (see

Note 2)

Total current in this mode equals:

STV0680/680A Standby current consumption (see

Note 1)

+ SDRAM self-refresh current (see

Note 2)

+ peripheral circuitry (approx. 50

µA, see Note 3).

+ 200

µA, based on 1.5k pull-up in camera (see Section 4)

and 15k pull-down in PC.

Table 17 : Current consumption, complete STV0680B+VV6444 camera

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