SPSB081 datasheet(39/135 Pages) STMICROELECTRONICS

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3.21

Thermal clusters

To provide an advanced on-chip temperature control, the power outputs are grouped in four clusters with

dedicated thermal sensors. The sensors are suitably located on the device. In case the temperature of a cluster

reaches the thermal shutdown threshold, the outputs assigned to this cluster are shut down (all other outputs

remain active). Each output cluster has a dedicated temperature warning and shutdown flag (SR7 & SR8). Hence,

the thermal cluster concept identifies a group of outputs in which one or more channels are in overload condition.

If thermal shutdown has occurred within an output cluster, or if temperature is rising within a cluster, it may be

desired to identify which of the output(s) is (are) determining the temperature increase.

Thermal clusters can be configured using bit TSD_CLUSTER_EN (CR20):

•

Standard mode (default): as soon as any cluster reaches thermal threshold the device is switched off. V1

regulator remains on and is switched off reaching TSD2.

All the thermal sensors are put in “OR”.

In fact, if one of these sensors reaches TSD1:

•

All outputs drivers and V2 are turned OFF.V1 remains on until TSD2.LIN and CAN transmitter are turned

OFF (but they are forced in "receive only" mode).

•

Cluster mode: only the cluster, which reached shutdown temperature is switched off.

In case cluster Th_CL1 reaches TSD1:

•

V1 remains ON until TSD2

In case cluster Th_CL4 reaches TSD1.

•

All outputs drivers and V2 are turned OFF.V1 remains on until TSD2.

•

LIN and CAN transmitter are turned OFF (but they are forced in "receive only" mode).

Figure 25. Thermal clusters identification

Table 11. Thermal cluster definition

Th_CL1

Th_CL2

Th_CL3

Th_CL4

OUT1, OUT2, OUT3, OUT4

Global

TW & TSD1 TSD2

TW & TSD1

TW,

TSD1

SPSB081

Thermal clusters

DS14048 - Rev 1

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