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參數(shù)資料
| 型號： | STV9118 |
| 廠商： | 意法半導體 |
| 英文描述： | LOW-COST I2C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITOR |
| 中文描述： | 低費用的I2C可控撓度多同步顯示器處理器 |
| 文件頁數(shù)： | 36/46頁 |
| 文件大?。?/td> | 577K |
| 代理商： | STV9118 |
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STV9118
36/46
10.8 - MISCELLANEOUS
10.8.1 - Safety functions
The safety functions comprise supply voltage
monitoring with appropriate actions, soft start and
soft stop features on H-drive and B-drive signals
on
HOut
and
BOut
outputs and X-ray protection.
For supply voltage supervision, refer to paragraph
Power supply and voltage references
on
page 25
and
Figure 1
. A schematic diagram putting togeth-
er all safety functions and composite PLL1 lock
and V-blanking indication is in
Figure 15
.
10.8.2 - Soft start and soft stop functions
For soft start and soft stop features for H-drive and
B-drive signal, refer to paragraph
Soft-start and
soft-stop on H-drive
on
page 29
and sub chapter-
DC/DC CONTROLLER SECTION
on
page 34
, re-
spectively. See also the
Figure 10
. Regardless
why the H-drive or B-drive signal are switched on
or off (I
2
C bus command, power up or down, X-ray
protection), the signals always phase-in and
phase-out in the way drawn in the figure, the first
to phase-in and last to phase-out being the H-drive
signal, which is to better protect the power stages
at abrupt changes like switch-on and off. The tim-
ing of phase-in and phase-out only depends on
the capacitance connected to
HPosF
pin which is
virtually unlimited for this function. Yet it has a dual
function (see paragraph
PLL1
on
page 26
), so a
compromise thereof is to be found.
10.8.3 - X-ray protection
The X-ray protection is activated if the voltage lev-
el on
XRay
input exceeds
V
ThrXRay
threshold. As a
consequence, the H-drive and B-drive signals on
HOut
and
BOut
outputs are inhibited (switched off)
after a 2-horizontal deflection line delay provided
to avoid erratic excessive X-ray condition detec-
tion at short parasitic spikes. The
XRayAlarm
I
2
C
bus flag is set to 1 to inform the MCU.
This protection is latched; it may be reset either by
V
CC
drop or by I
2
C bus bit
XRayReset
(see chap-
ter
I
2
C BUS CONTROL REGISTER MAP
on
page 21
).
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