I/O Timing Characteristics (ace, ace 2, boost)

This topic provides information about the camera's propagation delays ("response times") when operated via I/O lines.

The propagation delay is the length of time between the change of the analog I/O signal and the change of the camera's internal status – or vice versa.

Knowing the propagation delays is useful if you want to configure I/O control with a precision in the microsecond range.

All examples in this section assume that the Line Inverter feature is disabled.

In this topic Hide

Characteristics

Propagation Delays on Input Lines

Input Line Propagation Delays

Propagation Delays on Output Lines

Output Line Propagation Delays

Factors Influencing the Propagation Delays of I/O Lines

Factor

Opto-coupled Input Line

GPIO Input Line

Opto-coupled Output Line

GPIO Output Line

Operating temperature

Production spread of electronic componentsa

Aging

 

 

External I/O supply voltage

 

Load resistance

 

 

Load current

 

 

● = major influence, ○ = minor influence

 

a Production spread can result in different propagation delays even in cameras from the same batch that are operated under identical conditions.

Recommendations

Propagation Delays Measured on ace USB 3.0 Cameras

The propagation delays measured are based on 2000 ace USB 3.0 cameras from the same production batch.

The values should also apply to ace 2 cameras.

The values in the following tables are only valid under the following operating conditions: Don't base assumptions about propagation delays under different operating conditions on these values.

Input Lines

  Fast Edge

Slow Edge

Opto-coupled input line 4.5–7.5 μs (= rising edge)  19–28 μs (= falling edge)
GPIO input line <0.5 μs (= falling edge) <1 μs (= rising edge)

Output Lines

  Fast Edge

Slow Edge

Opto-coupled output line
(ace classic/U/L only)
3–6 μs (= falling edge)  27–38 μs (= rising edge)
GPIO output line <0.5 μs (= falling edge) <2.5 μs (= rising edge)