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L9679P Datasheet(PDF) 50 Page - STMicroelectronics |
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L9679P Datasheet(HTML) 50 Page - STMicroelectronics |
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50 / 272 page  Start-up and power control L9679P 50/272 DocID029275 Rev 1 Figure 25. Internal voltage monitors An active low pin output (RESET pin) is driven from the L9679P to allow resetting of external devices such as the microcontroller, sensors, and other ICs within the ECU. Three internal reset signals are generated by the device: POR Power On Reset - This reset is asserted when a failure is detected in the internal supplies or bandgap circuits. When active, all other resets are asserted. WSM_RESET Watchdog State Machine Reset - This reset is generated when the POR is active or when a failure is detected in the VCC supply. SSM_RESET System State Machine Reset - This reset is asserted when the POR or the WSM_RESET are active, or when a failure is detected in either Watchdog state machine, or again when the MCUFAULTB pin is active. The RESET pin is the active-low signal driven on the output pin, and is an inverted form of SSM_RESET. The cause of the RESET activation is latched and reported into the Fault Status Register FLTSR and cleared upon SPI reading. The reset logic shall be controlled as shown in the diagram below: |
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