MegaPlus ES 1020
User’s Manual
Redlake MASD, Inc.
Page
18
91000134-001 Rev. A
Trigger Double Exposure (TDE)
This
mode works exactly as the TPD mode with the following exception; an additional frame is read out
from the sensor.
Triggered Double Exposure
Internal Trigger timing
The trigger timing is based upon three user programmable registers.
(a) Transfer Pulse Delay (TPD):
This register sets the time delay from the detection of the trigger pulse
to the start of the transfer pulse sequence. The register is used to set the delay in increments of 2112ns.
Note that the transfer pulse sequence requires a front pedestal, then the transfer pulse and then a back
pedestal. Thus the TPD register cannot be used flash trigger sequences below the pedestal size (40us)
without external timing. The range that TPD can be set to is 6 to 65535 dec. (0001 to FFFF hex). This
results in a usable delay range from 30us to 138ms.
(b) Transfer Pulse Width (TPW):
This register sets the width of the photodiode to VCCD transfer pulse.
The register is used to set the width in increments of 33ns. This results in a pulse width of 33ns to 20us.
Note that the drive circuitry of the transfer pulse is limited to minimum pulse of about 800ns (A register
setting of 0010 hex).
The following diagram illustrates the trigger timing:
Trigger
FVAL
Data
Trigger
Transfer
SUB (Erase)
Pedestal = 31us
Strobe
Summary of Contents for MegaPlus ES 1020
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