L9779WD datasheet(38/170 Pages) STMICROELECTRONICS

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Functional description

L9779WD

38/170

DocID027452 Rev 5

6.5

Thermal shut down

There are 4 temperature sensors:



OT1 for VTRK1,2



OT2 for OUT1...10, OUT13…20, OUT21…28, IGN1…4.



OT3 for MRD



OT4 for V3V3

When OT1 is higher than θjunction for tOT time VTRK1,2 are switched off if they are in current

limitation.

When OT1 is lower than θjunction - θHYSTERESISv for tOT time, the device should return to

normal operation automatically.

When OT2 is higher than θjunction for tOT time all the OUTx and IGNx are switched off.

When OT2 is lower than junction - θHYSTERESISv for tOT time, the device should return to

normal operation automatically.

When OT3 is higher than θjunction for tOT time the MRD is switched off.

When OT3 is lower than θjunction - θHYSTERESISv for tOT time, the device should return to

normal operation automatically.

When OT4 is higher than θjunction for tOT time the V3V3 is switched off if it is in current

limitation.

When OT4 is lower than θjunction - θHYSTERESISv for tOT time, the device should return to

normal operation automatically.

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

MSC.

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 12. Temperature information

Parameter

Value

Unit

junction

165 to 185

°C

HYSTERESIS

5-10

°C

tOT

µs

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