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參數(shù)資料
| 型號： | CS2516KD8 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | Pulse-Load Battery Monitor |
| 中文描述： | 脈沖負載電池監(jiān)視器 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 143K |
| 代理商： | CS2516KD8 |
4
Program and Standby Currents:
I
P
=
=
1μA Standby Current = 4I
P
= 4μA (typ.)
9V
9.1m
V
CC
R
P
Test Pulse Width:
T
p
= R
d
C
T
x ln(V
P
) 242C
T
242 x 4.7μF 1.14ms
where R
d
is the dynamic cycle timer discharge impedance (440 typ.)
and V
P
=
[1n(V
P
) = 0.55 typ.]
Pulse Stretcher: Delay Time:
T
D
=
=
=
1ms
where V
d
= Schmitt Trigger Upper Threshold (2.5V typ.)
and I
src
= Typical source current at the PW pin at the nominal low battery sense threshold of 6.7V.
Pulse Width: T
p
= C
PW
R
PW
ln(V
S
) 0.51 x 0.1μF x 10m 510ms.
and V
S
=
[ln(V
S
) = 0.51 typ.]
Schmitt Trigger Upper Threshold
Schmitt Trigger Hysteresis
2.5 x 0.1μF
250μA
2.5C
PW
250μA
V
d
C
PW
I
src
Upper Charge Threshold
Lower Discharge Threshold
V
CC
220
W
C
T
CS2516
R
p
4.7
m
F
9.1M
W
9V
PW
OUT
Load Switch
R
p
SENSE
C
T
COM
C
pw
R
pw
10M
W
0.1
m
F
+
+
510
W
V
CC
Applications Information
Typical Application Circuit
The value of R
p
affects standby current, operating current,
and the test cycle period. The recommended value is
(V+/1μA) where V+ is the fresh battery voltage. Higher
values of R
p
are not recommended. Minimum recom-
mended value is (V+/10μA) which will increase both the
standby and operating currents by 10X and reduce the test
cycle period by the same factor; the test pulse width will
be unaffected.
The value of C
t
affects both the test cycle period and the
test pulse width. Of critical importance is the selection of a
low leakage type capacitor; if leakage current exceeds the
cycle timer charge current, the timer will not operate.
The pulse stretcher components R
PW
and C
PW
should be
selected such that the delay timer to charge C
PW
is shorter
than the test pulse width programmed by C
t
to guarantee
operation of the Output. The output is an open-collector
transistor which may be used to drive an indicator device
directly or to interface to logic family devices.
The SENSE input typical 8.5k input impedance appears
only during the test pulse; otherwise the SENSE input is in
a high impedance state. The effective low battery thresh-
old voltage can be modified (increased only) by means of a
voltage divider placed across the load resistor. This tech-
nique can also be used to effectively reduce the threshold
tolerance band.
Applications Formulae and Typical Values
C
Cycle Timer Period:
T
t
=
=
=
33sec.,
where V
t
= Upper Charge Threshold - Lower Charge Threshold (7V typ.)
7 x 4.7μF
1μA
7C
T
1μA
V
T
C
T
I
P
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