參數(shù)資料
型號: SCM20014
廠商: Motorola, Inc.
英文描述: VGA Digital Image Sensor(VGA數(shù)字圖像傳感器)
中文描述: VGA數(shù)碼圖像傳感器(顯卡數(shù)字圖像傳感器)
文件頁數(shù): 11/54頁
文件大?。?/td> 911K
代理商: SCM20014
SCM20014
MOTOROLA
11
Preliminary!! Last Update: 12/14/99
ing 10-bit data stream. The output is made available on
the upper 8 MSBs of the 10 bit output bus. The user can
select one of the 8 transformation curves shown in
Fig-
ure 13
via the
Post ADC Control Register, (Table 23),
on page 30
. The bottom curve is linear in which the input
is divided by four. For other choices, the I/O relationship
is kept 1:1 up to a certain breakpoint. There onwards a
straight line equation is used to transform the remaining
input values.
The default is the linear curve, breakpoints can be se-
lected via the slope and breakpoint control bits on the
Post ADC Control Register. This function can be by-
passed to output 10-bit linear data.
Figure 13. Available Companding Curves
2.4 Additional Operational Conditions
The SCM20014 includes initialization, standby modes,
and external reference voltage outputs to afford the
user additional applications flexibility.
2.4.1 Initialization
The INIT input pin (#28) controls reinitialization of the
SCM20014. This serves to assure controlled chip and
system startup. Control is asserted via a logic high in-
put. This state must be held a minimum of 1 ms and a 1
ms “wait period” should be allowed before chip process-
ing to ensure that the start-up routines within the
SCM20014 have run to completion, and to guarantee
that all holding and bypass capacitors, etc. have
achieved their required steady state values.
Tasks which are accomplished during startup include:
reset of the utility programming registers and initializa-
tion to their default values (please refer to previous sec-
tion for settings), reset of all internal counters and
latches, and setup of the analog signal processing
chain.
2.4.2 Standby Mode
The standby mode option is implemented to allow the
user to reduce system power consumption during peri-
ods which do not require operation of the SCM20014.
0
Data IN (10-bit)
D
511
255
127
63
191
0
255
127
63
31
15
47
79
95
111
1023
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