5-13
Application Notes
Power Modes
The SE4400 supports five power modes, defined in
, which offer trade-offs
between power consumption and image acquisition time.
indicates the current draw and recovery time (the time that elapses before the first
frame is acquired) for each mode. The power consumption is shown with the motor,
illumination, and aiming turned off. Select one of the states in
or switch among
them toward lower power consumption (longer startup time) as the time elapses since the
SE4400 was last used. These modes are displayed in
.
•
To enter Mode A, implement a power down sequence and disconnect power from
the SE4400:
1. Place the SE4400 in stand-by mode by programming the I
2
C settings found in
.
2. Force MCKI & CS* to the ground level.
3. In Mode 3, force EXSFT and EXHT to the ground level.
4. Disconnect power.
•
To enter Mode B, place the SE4400 in stand-by mode where the engine typically
draws 230 µA. To exit Mode B, program the I
2
C settings in
•
Power Mode C only applies to Mode 3. The recovery time is 66 ms for one
exposure frame and one data transfer frame.
Table 5-3. Power Mode Descriptions
Power
Mode
Description
Current Draw
(ma)
Mode 3
Recovery Time
Mode 1
Recovery Time
A
Completely powered off by a
hardware switch.
0
~156 ms
~566 ms
B
Host acquisition halted, SE4400
placed in standby via I
2
C settings.
0.2
~132 ms
~544 ms
C
Host acquisition halted, external
sync signals halted (EXSFT &
EXHT idle).
57
66 ms
N/A
D
Host acquisition halted, SE4400
running at full frame rate.
85
33 ms to 66 ms
33 ms to 66 ms
E
Acquiring images at full frame rate.
85
0 ms
0 ms
Содержание Symbol SE4400
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