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CS2516KN8 датащи(PDF) 4 Page - Cherry Semiconductor Corporation

номер детали CS2516KN8
подробное описание детали  Pulse-Load Battery Monitor
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производитель  CHERRY [Cherry Semiconductor Corporation]
домашняя страница  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS2516KN8 датащи(HTML) 4 Page - Cherry Semiconductor Corporation

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4
Program and Standby Currents:
IP =
=
Å 1µA Standby Current = 4IP = 4µA (typ.)
9V
9.1m½
VCC
RP
Test Pulse Width:
Tp = RdCT x ln(VP) Å 242CTÅ 242 x 4.7µF Å 1.14ms
where Rd is the dynamic cycle timer discharge impedance (440½ typ.)
and VP =
[1n(VP) = 0.55 typ.]
Pulse Stretcher: Delay Time:
TD =
=
=
Å 1ms
where Vd = Schmitt Trigger Upper Threshold (2.5V typ.)
and Isrc = Typical source current at the PW pin at the nominal low battery sense threshold of 6.7V.
Pulse Width: Tp = CPWRPW ln(VS) Å 0.51 x 0.1µF x 10m½ Å 510ms.
and VS =
[ln(VS) = 0.51 typ.]
Schmitt Trigger Upper Threshold
Schmitt Trigger Hysteresis
2.5 x 0.1µF
250µA
2.5CPW
250µA
VdCPW
Isrc
Upper Charge Threshold
Lower Discharge Threshold
VCC
220
W
CT
CS2516
Rp
4.7
mF
9.1M
W
9V
PW
OUT
Load Switch
Rp
SENSE
CT
COM
Cpw
Rpw
10M
W
0.1
mF
+
+
510
W
VCC
Applications Information
Typical Application Circuit
The value of Rp 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 Rp 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 Ct 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 RPW and CPW should be
selected such that the delay timer to charge CPW is shorter
than the test pulse width programmed by Ct 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 8.5k½ 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
Cycle Timer Period:
Tt ===
Å 33sec.,
where Vt = Upper Charge Threshold - Lower Charge Threshold (7V typ.)
7 x 4.7µF
1µA
7CT
1µA
VTCT
IP


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