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L9680 Folha de dados(PDF) 43 Page - STMicroelectronics

Nome de Peças L9680
Descrição Electrónicos  Automotive advanced airbag for mid/high end applications and cut-off battery IC
PDF  286 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9680 Folha de dados(HTML) 43 Page - STMicroelectronics

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DS11615 Rev 7
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L9680
Start-up and power control
285
The user can decide the charge and discharge time based on the ER CAP used in
application, in order to maximize the differential voltage and then improve the accuracy.
Anyway, a timeout on ER Discharge current has been implemented to prevent thermal
issue, so the discharge time cannot be longer than 350 ms.
Figure 17. ER CAP measurement timing diagram
The following formulas can be used to retrieve the ER CAP value from the voltage and
timing measurements.
T1 = discharge time
T2 = charge time, same as discharge time
T1 = T2 = T
V1 = Vstart - Vstop
V2 = Vend - Vstop
I1 = discharge current
I2 = charge current, same as discharge current
I1 = I2 = I
ILEAK = leakage current
V1 V2
+
I1 ILEAK
+
C
---------------------------T1
I2 ILEAK
–
C
--------------------------T2
+
=
C
2 I T
 
Vstart Vend 2 Vstop
–
+
----------------------------------------------------------------
=
ESR > 0
VER (t)
ER_DISCHARGE
ER_CHARGE
ESR = 0
Vstart
Vstop
Vend
T1
T2
GAPGPS02262



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