STV0680 datasheet(34/63 Pages) STMICROELECTRONICS

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Detailed chipset specifications

STV0680B + VV6444/6410/6500

34/63

Version 3.4

6.5.2

Using VV6410/6411/6500 (sensor operates at @ 3.3V 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 Sensor suspend mode current <100

µA (needs SUSPEND pin asserted with VV6500), see Table 15

and Table 16.

4 If the appropriate hardware to assert the sensor SUSPEND pin is not fitted, an additional current

consumption in Standby/PC Suspend mode of Approx. 50

µA can be expected with VV6500.

5 Option included in reference design to save current consumption, which can increase battery life

and increase chances of meeting USB suspend mode compliance requirements.

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

While playing back audio

sounds through speaker

90mA

Assuming 8

Ω speaker as explained in application note

AN1310

Standby Mode (when NOT

connected to USB):

Sensor SUSPEND pin

asserted (see

Note 4)

Approx. 220µA + SDRAM

self-refresh current

(see

Note 2) + sensor

suspend mode current

(see

Note 3)

Total current in this mode equals:

STV0680B 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. 50µA + SDRAM

self-refresh current

(see

Note 2) + sensor

suspend mode current

(see

Note 3)

Total current in this mode equals:

STV0680B 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 Chapter 6)

and 15k pull-down in PC.

+ Sensor suspend mode current (See

Note 3)

Standby Mode (when NOT

connected to USB): sensor

powered off using FET

(see

Note 5)

Approx. 220µA + SDRAM

self-refresh current

(see

Note 2)

Total current in this mode equals:

STV0680B Standby current consumption (see

Note 1)

+ SDRAM self-refresh current (see

Note 2)

+ peripheral circuitry (approx. 50

µA).

PC Suspend mode (when

connected to USB): sensor

powered off using FET

(see

Note 5)

Approx. 100µA + SDRAM

self-refresh current

(see

Note 2)

Total current in this mode equals:

STV0680B Standby current consumption (see

Note 1)

+SDRAM self-refresh current (see

Note 2)

+ peripheral circuitry (approx. 50

µA).

Table 18 : Current consumption, complete STV0680B+VV6410/6411/6500 camera

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