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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)： | 5/12頁 |
| 文件大?。?/td> | 514K |
| 代理商： | V61308P |
Pin Description
Pin
Name
Function
1
2
EN
RES
Push-pull active low enable output
Open drain active low reset output.
RES must be pulled up to V
DD
even
if unused
Watchdog timer clear input signal
GND terminal
No connection
Voltage supply
R
input for RC oscillator tuning
Voltage comparator input
3
4
5
6
7
8
TCL
V
SS
NC
V
DD
R
V
IN
Ta ble 5
Functional Description
V
Monitoring
The power-on re set and the power-down re set are gen er
ated as a re sponse to the ex er nal volt age level on the V
IN
in put. The ex er nal volt age level is typ cally ob ained from
a volt age di vider as shown in Fig. 9. The user de ines an
ex er nal volt age di vider to set the de sired thresh old level
for power-on re set and power-down re set in his sys em.
The in er nal com para or ref er ence volt age is typ cally
1.17 V.
At power-up the re set out put (RES) is held low (see Fig.
5). When V
IN
be comes greater than V
REF
, the RES out put is
held low for an ad di ional power-on re set (POR) de ay
which is equal to the watch dog time T
(typ cally 100 ms
with an ex er nal re sis or of 118 k
con nected at R pin).
The POR de ay pre vents re peated tog gling of RES even if
V
and the INPUT volt age drops out and re cov ers. The
POR de ay al ows the mi cro pro ces sor’s crys al os cil a or
time to start and sta bi ize and en sures cor ect rec og ni ion
of the re set sig nal to the mi cro pro ces sor.
The RES out put goes ac ive low gen er at ng the
power-down re set when ever V
IN
falls be ow V
REF
. The sen
si iv ty or re ac ion time of the in er nal com para or to the
volt age level on V
IN
is typ cally 5 μs.
Timer Programming
The on-chip os cil a or needs an ex er nal re sis or R
con
nected be ween the R pin and V
(see Fig. 9). It al ows
the user to ad ust the power-on re set (POR) de ay, watch
dog time T
and with this also the closed and open time
win dows as well as the watch dog re set pulse width
(T
WD
/40).
With R
= 118 k
, the typ cal de ays are:
- Power-on re set de ay: T
POR
- Watch dog time:
T
WD
- Closed win dow:
T
CW
- Open win dow:
T
OW
- Watch dog re set:
T
WDR
Note: The cur ent con sump ion in creases as the fre
quency in creases.
is 100 ms
is 100 ms
is 80 ms
is 40 ms
is 2.5 ms
Watchdog Timeout Period Description
The watch dog time out pe iod is di vided into two parts, a
“closed" win dow and an “open" win dow (see Fig.4) and is
de ined by two pa am e ers, T
WD
and the Open Win dow
Per cent age (OWP).
The closed win dow starts just af er the watch dog timer re
sets and is de ined by T
CW
= T
WD
- OWP(T
WD
).
The open win dow starts af er the closed time win dow fin
ishes and lasts till T
WD
+ OWP(T
WD
). The open win dow
time is de ined by T
OW
= 2 x OWP(T
WD
).
For ex am ple if T
= 100 ms (ac ual value) and OWP =
±20% this means the closed win dow lasts dur ng first the
80 ms (T
CW
= 80 ms = 100 ms - 0.2 (100 ms)) and the
open win dow the next 40 ms (T
= 2 x 0.2 (100 ms) = 40
ms). The watch dog can be ser viced be ween 80 ms and
120 ms af er the timer re set. How ever as the time base is
±10% ac cu ate, soft ware must use the fol ow ng cal cu a
tion for ser vic ng sig nal TCL dur ng the open win dow:
Re ated to curves (Fig. 10 to Fig. 20), es pe cially Fig. 19
and Fig. 20, the re a ion be ween T
and R
could
easily be de ined. Let us take an ex am ple de scrib ng the
vari a ions due to pro duc ion and tem per a ure:
1. Choice, T
= 26 ms.
2. Re ated to Fig. 20, the co ef i cient (T
WD
to R
EXT
) is 1.125
where R
EXT
is in k
and T
WD
in ms.
3. R
EXT
(typ.) = 26 x 1.125 = 29.3 k
.
5
V6130
Block Diagram
Fig. 8
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