L9680 datasheet(52/286 Pages) STMICROELECTRONICS

52 / 286 page

Start-up and power control

L9680

52/286

DS11615 Rev 7

Figure 26. Internal voltage monitors

An active low pin output (RESET pin) is driven from the L9680 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 or VCORE 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.

During the RESET event the logic is under reset but the FLTSR is not reset. So the fault info

will be available as soon as the IC will be out of reset.

The reset generated by the MCUFLT_ERR can be masked by the MCU_FLT_TEST test

mode signal. This allows verification of MCUFLT pin operation and, in turn, microcontroller

fault conditions without asserting a reset. The MCURST bit is still set whether in test mode

or not.

GAPGPS02272

VINT3V3

VBGM

(Monitor)

OV_VINT3V3

UV_VINT3V3

VINT3V3

Monitor

OV_CVDD

UV_CVDD

VDD

Monitor

VDD

VREG_ERR

VCORE_OV

VCORE_ERR

VCORE_UV

VCORE

Monitor

VCORE pin

VCC_OV

VCC_ERR

VCC_UV

VCC

Monitor

VCC

10μs

Deglitch

Filter

1ms

One-shot

Pulse gen

MCUFAULTB pin

MCUFLT_ERR

GNDA

Monitor

GNDA

GNDD

GNDSUBx

GNDD

Monitor

GNDA_ERR

GNDD_ERR

GND_ERR

BSTGND

Monitor

BSTGND_loss

VBG_READY

VBGR

(Reference)

Reference for

Controlling all supplies

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