xiQ - Technical Manual Version 1.0
63
Description:
DownS = Current camera DownSampling (XI_PRM_DOWNSAMPLING)
t
eio
= Trigger (Digital Input) to Strobe (Digital Output) (on some models is listed: Off->On change / On->Off change)
t
exp
= Strobe (Sensor) to Digital Output (on some models is listed: Off->On change / On->Off change)
t
expo
= Start of exposition to Exposure Active Digital Output
LC
= Current Line Count (XI_PRM_ HEIGHT)
BWF = Bandwidth Factor see table below
t
exps
= Current Exposure Time set (XI_PRM_EXPOSURE)
Conditions: XI_PRM_DEBOUNCE_EN=0 (off).
Bandwidth factor
Bandwidth factor is a number reflecting the ratio between the maximum sensor frequency and the current sensor frequency,
calculated from the Bandwidth Limit.
BWF = F
max
/ F
limit
Where F
max
is maximum possible clock for used sensor in MHz and F
limit
is used clock depending on Bandwidth Limit parameter
set in API (XI_PRM_LIMIT_BANDWIDTH). F
limit
is set in 1MHz steps and cannot go lower than F
min
.
MQ003xG-CM
F
max
= 24MHz
F
min
= 10MHz
limit
325 * BWL
6 LC
F
*
[
]
10368 * BPP
LC
MHz
t
fot
= 40.625*BWF [µs]
BPP
number of bytes per pixel
BWL bandwith limit in Mbit/s
MQ042xG-CM and MQ022xG-CM
F
max
= 48MHz
F
min
= 5Mhz
limit
129 * BW
12 LC
F
*
[
]
8192 * BPP
LC
MHz
t
fot
= 64.5 * BWF [µs]
BPP
number of bytes per pixel
BW
bandwidth in Mbit/s
Minimum trigger period (t
trig_min
)
Minimum trigger period can be calculated using the following formula:
t
trig_min
= t
exp
+ t
exps
(When exposure time is longer than readout time)
t
trig_min
= t
rd
(When exposure time is significantly shorter then readout time)
t
trig_min
= t
exps
+ t
fot
(When exposure is smaller than readout time but the difference is less than t
fot
)
Example for MQ022MG-CM, Exposure time = 500µs, image = 2048 pixels width x 1088 pixels height with maximum bandwidth
and 1 byte per pixel:
t
trig_min
= 10µs + (37.625 + 5.375 * 1088 lines) * 1 = 5895µs
