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Power Modes
The SE4400 supports five power modes, defined in
between power consumption and image acquisition time.
Power
Mode
A
Completely powered off by a
hardware switch.
B
Host acquisition halted, SE4400
placed in standby via I
C
Host acquisition halted, external
sync signals halted (EXSFT &
EXHT idle).
D
Host acquisition halted, SE4400
running at full frame rate.
E
Acquiring images at full frame rate.
Table 5-3
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
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
Table A-4 on page
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
•
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
Description
2
C settings.
A-8.
Table
5-3, which offer trade-offs
Current Draw
Mode 3
(ma)
Recovery Time
0
~156 ms
0.2
~132 ms
57
85
33 ms to 66 ms
85
Table 5-3
Figure
5-6.
2
C settings in
Application Notes
Mode 1
Recovery Time
~566 ms
~544 ms
66 ms
N/A
33 ms to 66 ms
0 ms
0 ms
or switch among
2
C settings found in
Table A-5 on page
A-8.
5-13
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