參數(shù)資料
型號(hào)： AD9992BBCZ
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： 12-Bit CCD Signal Processor with Precision Timing Generator
中文描述： SPECIALTY CONSUMER CIRCUIT, PBGA105
封裝： 8 X 8 MM, 0.65 MM PITCH, ROHS COMPLIANT, MO-225, CSPBGA-105
文件頁(yè)數(shù)： 50/92頁(yè)
文件大?。?/td> 718K
代理商： AD9992BBCZ
AD9992
FIELD COUNTERS
The AD9992 contains three field counters (primary, secondary,
and mode). When these counters are active, they increment
with each VD cycle. The mode counter is the field counter used
with the mode register to control the vertical timing signals,
which was discussed in the MODE Registers section. The
primary and secondary counters are more flexible and are
generally used for shuttering signal applications. Both the
primary and secondary counters have several modes of
operation that are dictated by Address 0x70, including
Rev. 0 | Page 50 of 92
Normal (single count)
RapidShot (repeating count)
ShotDelay (delayed count)
ShotDelay with RapidShot
Manual exposure
Manual readout
Force to idle
The primary counter regulates the expose and read actions by
regulating the SUBCK and VSG signals. In addition, if the
RapidShot feature is used with the primary counter, the SUBCK
and VSG masking automatically repeats as necessary for
multiple expose/read cycles. The secondary counter has no
effect on the SUBCK or VSG signal. Both counters can be used
to regulate the general-purpose signals described in the
General-Purpose Outputs (GPOS) section.
Table 21. Primary/Secondary Field Counter Registers (Address 0x70, Address 0x71, and Address 0x72)
Register
Length
Description
PRIMARY_ACTION
3b
0: idle, no counter action. GPO signals can still be controlled using polarity or GP_PROTOCOL = 1.
SECOND_ACTION
3b
1: activate counter. Single cycle of counter from 1 to counter maximum value, and then returns to idle
state.
2: RapidShot. After reaching maximum counter value, counter wraps and repeats until reset.
3: ShotTimer. Active single cycle of counter after added delay of N fields (use the corresponding DELAY
register).
4: ShotTimer with RapidShot. Same as 2, with added delay of N fields between each repetition.
5: manual exposure. Primary counter stays in exposure until manual readout or reset to idle.
This mode keeps the SUBCK and VSG pulses masked indefinitely.
6: manual readout. Primary counter switches to readout (VSG pulses becomes active).
7: force to idle.
PRIMARY_MAX
13b
Primary counter maximum value.
SECOND_MAX
12b
Secondary counter maximum value.
VDHD_MASK
3b
Mask VD/HD during counter operation.
PRIMARY_DELAY
13b
ShotTimer. Number of fields to delay before the next primary count (exposure) starts. If using ShotTimer
with RapidShot, delay value is used between each repeat.
PRIMARY_SKIP
1b
When using ShotTimer with RapidShot, use primary delay value only before first count (exposure).
SECOND_DELAY
13b
ShotTimer. Number of fields to delay before the next secondary count starts. If using ShotTimer with
RapidShot, delay value is used between each repeat.
SECOND_SKIP
1b
When using ShotTimer with RapidShot, use secondary delay value only before first count.
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