L9959S datasheet(25/43 Pages) STMICROELECTRONICS

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DocID023416 Rev 6

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L9959S, L9959T

Application information

Figure 15. Current limitation

4.2.3

Temperature dependent current reduction

If the device reaches the temperature TILR, the current will be reduced (see Figure 16:

Temperature dependent current reduction). If the temperature reaches the temperature

shutdown threshold, the outputs are switched off. The current limitation information is written

into the diagnosis register 2 (DIA_REG2).

Figure 16. Temperature dependent current reduction

4.2.4

Short to battery (SCB) and short to Ground (SCG)

While the power stages are on, the current through them is monitored. If the output current

reaches the current limit IL, the output is switched off after the blanking time tb. In case the

current reaches the limit IOC during this time, a short to battery (SCB) on low-sides or a short

to ground (SCG) on high-sides is diagnosed, the affected output driver is switched off

immediately, the not affected one after the time tDF_del. In order to confirm this error, the

outputs are turned on again. Only if the error is then again detected, it is entered into the

diagnosis register (DIA_REG1) and the device is disabled. Otherwise, the event is

disregarded.

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