L9779WD-SPI datasheet(33/141 Pages) STMICROELECTRONICS

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L9779WD-SPI

Functional description

140

6.4

Thermal shut down

There are 4 temperature sensors:



OT1 for VTRK1,2



OT2 for OUT1...10, OUT13…20, OUTA...D, IGN1…4.



OT3 for MRD



OT4 for V3V3

When OT1 is higher than

junction for tOT time VTRK1,2 are switched off if they are in current

limitation.

When OT1 is lower than

junction - HYSTERESISv for tOT time, the device should return to

normal operation automatically.

When OT2 is higher than

junction for tOT time all the OUTx and IGNx are switched off.

When OT2 is lower than junction -

HYSTERESISv for tOT time, the device should return to

normal operation automatically.

When OT3 is higher than

junction for tOT time the MRD is switched off.

When OT3 is lower than

junction - HYSTERESISv for tOT time, the device should return to

normal operation automatically.

When OT4 is higher than

junction for tOT time the V3V3 is switched off if it is in current

limitation.

When OT4 is lower than

junction - HYSTERESISv for tOT time, the device should return to

normal operation automatically.

Thermal warning information from OT1,OT2,OT3,OT4 is latched and communicated by SPI.

Thermal warning information is reset when it is read.

The latch behavior affects only flags bit, while drivers and supplies use the OTx just after the

filter to return to normal operation.

Table 11. Temperature information

Parameter

Value

Unit

junction

165 to 185

°C

HYSTERESIS

5-10

°C

tOT

µs

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