L9959 datasheet(25/49 Pages) STMICROELECTRONICS

25 / 49 page

DocID027540 Rev 3

25/49

L9959

Application information

Figure 13. DIR-change current flow phase 2

Figure 14. DIR-change output voltage

4.2

Protection and monitoring

A set of failure as Short-circuit to Ground (SCG), Short-circuit to battery (SCB) and Short-

circuit to load (SCL) errors (SBC, SCG, SCL) are confirmed after their occurrence by

accessing the error condition after time tdelay_retest a second time. Only after the error is

confirmed, it is entered into the diagnosis register 1 (DIA_REG1), and the device is disabled

and no further diagnosis is run.

The device can be enabled again by the following actions: Power-on reset, disabling and

enabling the device using the pins /ABE or DIS (e.g. disabling - enabling sequence). The

diagnosis registers can be cleared by sending a reset command by SPI (STATCON_REG)

to either diagnosis register 1 (DIA_REG1) or 2 (DIA_REG2). The bit1 (Reset) of the

CONFIG_REG if forced to zero resets both the device registers configuration and diagnosis

registers to default but is not able to restart the device. In order to restart IC it is necessary

L9959 Fiches technique(PDF) 25 Page - STMicroelectronics