STV0680 datasheet(20/63 Pages) STMICROELECTRONICS

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STV0680B hardware interfaces

STV0680B + VV6444/6410/6500

20/63

Version 3.4

STV0680B hardware interfaces

4.1

STV0680B pinout

The STV0680B pinout has been carefully developed to minimise the physical size of the support

printed circuit board by facilitating placement of and electrical routing to peripheral support

components such as the SDRAM. The complete pinout and listing is shown in

Chapter 6

4.2

Sensor interface

STV0680B uses a standard ST digital interface from the sensor, and the sensor clock input is

provided by an output from STV0680B. Designing a camera using this chipset should design as

close as possible to the reference design (

Chapter 6), in which case the chipset can be regarded as

a functional ‘black box’, and no further details regarding the STV0680B-sensor interface are

required.

4.3

Memory interface

STV0680B is designed to interface to an external 16Mbit or 64Mbit SDRAM (see

Table 3). The

SDRAM device must have a 16 bit wide data bus and operate from a 3.3V supply. Two sizes of

SDRAM memory are supported by STV0680B, 16MBits (1M x 16 bits wide) or 64MBits (4M x 16

bits wide), the memory size is auto-detected by STV0680B. STV0680B clocks the SDRAM at

6MHz, typically this is well below the figures offered by most manufacturers’ devices. Devices which

are PC66 and/or PC100 compliant are preferred. For interface wiring, see

Chapter 6

4.3.1

SDRAM current consumption

For maximum system battery life while no pictures are being taken, and to assist in meeting

requirements for USB compliance, an SDRAM should be chosen with the lowest possible self

refresh current specification. For suggested SDRAM part numbers, see

Chapter 6

In addition, the USB suspend mode current specification requires that the camera will consume no

greater than 300

µA when un-tethered. Meeting this specification, which is included in the

requirements for USB compliance, assumes an SDRAM with up to approximately 250

µA self-

refresh current, based on a current consumption of approximately 50

µA for STV0680B+support

circuit.

4.3.2

SDRAM interface timing requirements

The following timing diagrams should be referred to when selecting SDRAM other than those

recommended in

Chapter 6

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