STPM098C datasheet(25/110 Pages) STMICROELECTRONICS

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<FLT_REF>_FAULT_RESPONSE1 <FLT_REF>_FAULT_RESPONSE

Description

Latched with active pull-down - enables active pull-

down first and disable all PWM outputs

subsequently; the device moves to SAFE_HIZ mode

(default)(3)

1. Fault danger for the application is considered low. The fault can be ignored with no corrective action applied neither internal

or external.

2. Fault danger for the application is considered high. The corrective action shall be taken as soon as it is detected by the

device by establishing SAFE_HIZ.

3. Fault danger for the application is considered high. The corrective action shall be taken as soon as it is detected by the

device by activating an active pull-down and successively establishing SAFE_HIZ.

3.4.1.2

Fault output redirection (FOR)

STPM098C implements a multiple source of fault signaling by means of pins FAULT, SM_ALERT, VRRDY1/2,

VR_HOT, POWERIN_ALERT and through a dedicated PMBus™ flag.

Fault output redirection pins are asserted LOW while the PMBus™ flag is set to ‘1’ each time an LTC fault is

detected according to the following table.

Note:

While the PMBus™ flag is always asserted in case of fault event, the pin signaling is strictly related to fault

reaction. Pin signaling of a fault is only active if the fault has a configurable or nonconfigurable LTC reaction.

Table 21. FOR summary

PMBus™ flag signaling

Source diagnosis

Fault output pin signaling

Fault description

INT_RST = 1

VREF1 monitor

FAULT = SM_ALERT = VRRDY1 =

VRRDY2 = 0

Undervoltage on VREF1

INT_RST = 1

VREF1 monitor

FAULT = SM_ALERT = VRRDY1 =

VRRDY2 = 0

Overvoltage on VREF1

INT_RST = 1

VREF1 monitor

FAULT = SM_ALERT = VRRDY1 =

VRRDY2 = 0

Overtemperature on VREF1

VREF2_UV = 1

VREF2 monitor

FAULT = SM_ALERT = VRRDY1 =

VRRDY2 = 0

Undervoltage on VREF2

VREF2_OV = 1

VREF2 monitor

FAULT = SM_ALERT = VRRDY1 =

VRRDY2 = 0

Overvoltage on VREF2

VREF2_UV = 1

VREF2 monitor

FAULT = SM_ALERT = VRRDY1 =

VRRDY2 = 0

Overtemperature on VREF2

VCC_UV = 1

VCC monitor

FAULT = SM_ALERT = VRRDY1 =

VRRDY2 = 0

Undervoltage on VCC

VCC_OV = 1

VCC monitor

FAULT = SM_ALERT = VRRDY1 =

VRRDY2 = 0

Overvoltage on VCC

INT_RST = 1

ICM

FAULT = SM_ALERT = VRRDY1 =

VRRDY2 = 0

Main clock stuck violation

CLK_MISMATCH = 1

CLK1_TIME_OUT = 1

CLK2_TIME_OUT = 1

ICM

FAULT = SM_ALERT = VRRDY1 =

VRRDY2 = 0

Oscillators mismatch or auxiliary

clock stuck violation

AGND_LOSS = 1

DGND_LOSS = 1

GLM

No pin signaling

Loss of power or signal grounds

OT_SD = 1

OTM

FAULT = SM_ALERT = VRRDY1 =

VRRDY2 = 0

Thermal shutdown

OTM_WR = 1

OTM

No pin signaling

Thermal warning

VIN_UV = 1

VIN monitor

FAULT = SM_ALERT = VRRDY1 =

VRRDY2 = 0

Input Overvoltage

IIN_OC = 1

IIN monitor

FAULT = SM_ALERT = VRRDY1 =

VRRDY2 = 0

Input over-current

STPM098C

Functional description

DS14440 - Rev 1

page 25/110

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