5-4
SE4400 Integration Guide
the Vcc supply voltage cannot meet this rise time requirement, bring REG_RES* low by
external means for a minimum of 500 µs.
After a successful reset, the I
2
C registers contain default parameters that place the
SE4400 in stand-by mode. Initialize the SE4400 with the register values listed in
and
2
C programming can be performed as soon as the SE4400 is reset,
and typically takes about 31 ms.
The master clock input, MCKI, must begin any time before the EXSFT pulses. The
frequency of MCKI can be between 10MHz and 12.727MHz; 12MHz is recommended. If
the system must run at a slower frequency, adjust the I
2
C registers according to
LC99704B-
WK3 Sanyo DSP Specification
,
Version 1
. Minimize the jittering of MCKI as the SE4400 is
sensitive to this.
To minimize the time that the charge pump, which generates ±5 V so that the charge can
properly shift out of the CCD sensor, takes to arrive at regulation, implement a startup
sequence. EXSFT should be given 45 pulses, each with a period of 8 line times. Be sure
that the motor is not in toggle mode (see
on page 5-16) during this startup
period. The charge pump is fully charged approximately 55 ms after the pulses begin.
Delay the final I
2
C initialization parameters (Setting B) listed in
possible, but complete their programming at least 2 MCKI periods before the first frame.
EXHT must begin at least 490H before the first frame transfer begins for the internal analog
clamping circuit to function properly. The timing specifications of EXHT are described in the
on page 5-16) and tracking of the motor position
is desired, set the focus motor in a known initial state at least 20 ms before the first
exposure period to track the focus position as it is changed in each frame.
Summary of Contents for Symbol SE4400
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