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L9680 Datasheet(PDF) 189 Page - STMicroelectronics

Part # L9680
Description  Automotive advanced airbag IC for mid/high end applications
PDF  277 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9680 Datasheet(HTML) 189 Page - STMicroelectronics

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L9680
Watchdog timers
276
10.2
Algorithmic watchdog (WD2)
The algorithmic watchdog (WD2) is intended to protect higher software layers, and as such
requires servicing at a much slower rate and allows for software jitter as compared with
WD1. Additionally, WD2 is not implemented as a window watchdog, but is a maximum-time
watchdog, where refresh is accepted at any time before the timer expires.
The overall WD2 functionality is described in the following state diagram:
Figure 47. Algorithmic watchdog timer flow diagram



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