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L9679P bảng dữ liệu(PDF) 43 Page - STMicroelectronics

tên linh kiện L9679P
Giải thích chi tiết về linh kiện  Automotive advanced airbag IC for mid/high end applications
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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L9679P bảng dữ liệu(HTML) 43 Page - STMicroelectronics

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L9679P
Start-up and power control
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6.5.2
ER CAP ESR measurement
The IC contains the capability to perform a measurement of the equivalent series resistance
of energy reserve capacitor. In this case the discharge current is 10 times higher to create a
voltage difference proportional to the ER CAP ESR. The voltage measurement and
conversion is automatically executed once the user requires the ESR measurement through
the LPDIAGREQ register.
Figure 17. ER ESR measurement block diagram
Upon an ESR measurement is requested, the IC executes an internal automatic sequence
to take three voltage measurements at the ER node, toggling the ER discharge current
source on and off as shown in Figure 18. The test lasts for TESR_DIAG. After this time has
elapsed, the results can be retrieved by reading the DIAGCTRL_x registers. The three ER
voltage measurements are provided at the same time in DIAGCTRLA, DIAGCTRLB and
DIAGCTRLC registers. During the execution of the ESR measurement no other activity on
ADC is allowed. The user must ensure no other ADC requests are queued to be executed at
the same time of ESR measurement. The ESR diagnostic, once initiated, will continue
without interruption even if the device enters in ER State because of a battery loss event.



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