STV0680 datasheet(24/63 Pages) STMICROELECTRONICS

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STV0680B hardware interfaces

STV0680B + VV6444/6410/6500

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Version 3.4

into Suspend mode (in the case of VV6410/6411/6500). This has a significant improvement on

battery life.

4.6.3

Battery type

This is hardware dependant. The schematics referred to in

Chapter 6 assume either three or four

1.5V cells.

4.7

Quartz crystal

Regardless of the sensor type or anti-flicker requirements, the sensor + STV0680B chipset

operates from a single 12MHz fundamental quartz crystal. For specification requirements, see

Table 13. STV0680B includes an on-chip low jitter PLL, for PLL characteristics, see Table 12.

4.8

Numeric LCD interface

STV0680B supports a 2-digit LCD panel only, for alpha-numeric display.

4.8.1

LCD types

STV0680B connects to a non multiplexed, direct drive LCD with 2 x 7 segments. Many LCD types

are compatible with this interface. The LCD refresh frequency is 34.7Hz.

4.8.2

LCD interface pinout

The convention for segment numbering is as follows: ’0’ connects to segment ’a’, ’1’ connects to

segment ’b’, and so on, where a to g are standard for all 7-segment displays, as well as an LCD

common output, giving fifteen signals in total.

4.9

Switches and LED’s

The GPIO lines on STV0680B have pre-defined functions as follows, see

Section 2.2 for user

interface functionality, and

Chapter 6 for precise hardware implementation

4.9.1

MODE push button and SHUTTER push button: GPIO0 and GPIO1

Both push button inputs have internal de-bounce circuits, reducing the amount of hardware required

externally. It is recommended that labelling is used on the camera casing to help the user

understand the functioning of the 2-button interface.

4.9.2

Input to select between 50 and 60Hz flicker frequency: GPIO3

This allows for factory setting of the anti-flicker frequency, dependant on the final country of

destination. See also

Section 2.6. The polarity of this selection is detailed in the reference design

(see

Chapter 6).

4.9.3

LED indicator output: GPIO5

The LED output has an 8mA current sinking capability.

4.9.4

Other pins: GPIO2, 4, 6, 7

With STV0680B-001, these pins are un-used and should be tied to GND.

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