Specifications

Camera interfaces

Bonito Technical Manual V2.2.1

This is an open collector optocoupler output. The transistor is conductive dur-

ing the active exposure time of the image sensor.

The power dissipation through the optocoupler’s transistor must not exceed

150 mW.

A typical value for the external pull-up resistor is R = 4700 . This ensures risk-

free operation to the upper Vcc limit

The start of exposure edge (falling edge at V

out

) is delayed for about 3 s typi-

cally, the end of exposure edge for about 20 – 50 s. Latter is mainly caused by

the storage time of the photo transistor and is strongly depending on the exter-

nal pull-up resistor value R. To let safely toggle the output between high and

low state please use exposure times above 10 s and also observe a gap of 50 s

or more between two exposures. Faster rates may also work, but should be

tested individually. Consequently, in the default continuous mode (M=0) the

output does not toggle because the inter-exposure gap is too short.

Active exposure is also displayed by the L3 indicator at the camera’s back side.

Reserve I/O (pin 5, 9 and 14-15)

Note



The optocoupler adds an intrinsic delay to the signal.

Note



This output is not recommended for new system designs.

Use the synchronization output feature instead: see Chapter

Synchronization output (pin 6) on page 24.

Note



The pins 5, 9, 14 and 15 are reserved for future use. Do not con-

nect. Currently they have no function, but this may change.