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參數(shù)資料
| 型號： | V61308P |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Accurate Power Surveillance and Software Monitoring |
| 中文描述： | 精確的功率監(jiān)測及軟件監(jiān)控 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 514K |
| 代理商： | V61308P |
V6130
4.
The ra io be ween T
WD
= 26 ms and the (TCL pe iod)
= 25.4 ms is 0.975.
Then the re a ion over the pro duc ion and the full tem
per a ure range is, TCL pe iod = 0.975 x T
WD
0.975 x R
or TCL pe iod = , as typ cal value.
1.125
a) While PRODUCTION value un known for the cus-
tomer when R
EXT
≠
118 k
.
b) While op er at ng TEMPERATURE range
-40 °C
≤
T
A
≤
+85 °C.
5. If you fixed a TCL pe iod = 26 ms
26 x 1.125
R
= 30 k
.
0.975
If dur ng your pro duc ion the T
time can be mea
sured at T
A
= +25 °C and the μC can ad ust the TCL
pe iod, then the TCL pe iod range will be much larger
for the full op er at ng tem per a ure.
Timer Clear ng and RES Ac ion
The watch dog cir cuit mon ors the ac iv ty of the pro ces
sor. If the user’s soft ware does not send a pulse to the
TCL in put within the pro grammed open win dow time out
pe iod, a short watch dog RES pulse is gen er ated which is
equal to T
/40 = 2.5 ms typ cally (see Fig. 6).
With the open win dow con straint, new se cu ity is added
to con ven ional watch dogs by mon or ng both soft ware
cy cle time and ex e cu ion. Should soft ware clear the
watch dog too quickly (in cor ect cy cle time) or too slowly
(in cor ect ex e cu ion), it will cause the sys em to be re set.
If the soft ware is stuck in a loop which in cludes the rou ine
to clear the watch dog, a con ven ional watch dog will not
re set the sys em even though the soft ware is mal unc ion
ing; the V6130 will gen er ate a sys em re set be cause the
watch dog is cleared too quickly.
If no TCL signal is ap plied be ore the closed and open
win dows ex pire, RES will start to gen er ate square waves
of pe iod (T
CW
+ T
OW
+ T
WDR
). The watch dog will re main in
this state un il the next TCL fall ng edge ap pears dur ng
an open win dow, or un il a fresh power-up se quence. The
sys em en able out put, EN, can be used to pre vent crit cal
con rol func ions be ng ac i vated in the event of the sys
tem go ng into this fail ure mode (see sec ion “En able - EN
Out put”).
The RES out put must be pulled up to V
even if the out
put is not used by the sys em (see Fig. 9)
Com bined Volt age and Timer Ac ion
The com bi na ion of volt age and timer ac ions is il us
trated by the se quence of events shown in Fig. 7. On
power-up, when the volt age at V
reaches V
, the
power-on-reset, POR, de ay is in ial zed and holds RES
ac ive for the time of the POR de ay. A TCL pulse will have
no ef ect un il this power-on-reset de ay is com pleted. Af
ter the POR de ay has elapsed, RES goes in ac ive and
the watch dog timer starts act ng. If no TCL pulse oc curs,
RES goes ac ive low for a short time T
af er each
closed and open win dow pe iod. A TCL pulse com ng
dur ng the open win dow clears the watch dog timer. When
the TCL pulse oc curs too early (dur ng the closed win
dow), RES goes ac ive and a new time out se quence
starts. A volt age drop be ow the V
REF
level for lon ger than
typ cally 5 μs, over ides the timer and im me di ately forces
RES ac ive and EN in ac ive. Any fur her TCL pulse has no
ef ect un il the next power-up se quence has com pleted.
En able - EN Out put
The sys em en able out put, EN, is in ac ive al ways when
RES is ac ive and re mains in ac ive af er a RES pulse un il
the watch dog is ser viced cor ectly 3 con sec u ive times
(ie. the TCL pulse must come in the open win dow). Af er
three con sec u ive ser vices of the watch dog with TCL dur
ing the open win dow, the EN goes ac ive low. A mal unc
tion ng sys em would be re peat edly re set by the
watch dog. In a con ven ional sys em crit cal mo or con
trols could be en er gized each time re set goes in ac ive
(time al owed for the sys em to re start) and in this way the
elec ri cal mo ors driven by the sys em could func ion out
of con rol. The V6130 pre vents the above fail ure mode by
us ng the EN out put to dis able the mo or con rols un il
soft ware has suc cess ully cleared the watch dog three
times (ie. the sys em has cor ectly re started af er a re set
con di ion).
6
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