L9396 datasheet(58/109 Pages) STMICROELECTRONICS

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Remote sensor interface

L9396

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DS12539 Rev 6

5.2

Tracking regulation

RSUH0 and RSUH1 output pins can be configured as independent tracking regulators; this

is the default configuration at start-up. Each regulator tracks the voltage reference given by

the VCC (default) or VCC5 rail, depending on the user selection via SPI command. The 2

channels can be activated or deactivated independently (default state is off). Over/under

voltage and over current monitoring are applied to RSU0/1 channels when in tracking

regulator configuration and result bits are available via SPI.

5.3

Remote sensor interface fault protection

Each output is short circuit protected by an independent current limit and a thermal

detection circuit. Current limit and overcurrent detection are present for both RSUHx and

RSULx and they are independent of RSUHx and RSULx. In case RSUHx overcurrent is

detected the output stage is disabled after filter time while in case of RSULx overcurrent it's

not disabled. In any case if the thermal protection (shared between RSUH and RSUL) is

triggered the output stage is disabled. In case the thermal warning level would not be

reached, the current limitation circuitry will prevent damages on the channel, while operating

the output. This fault condition does not interfere with the normal operation of the IC or with

the operation of the other channels.

All RSUHx(x=0,1,2,3) are independently protected against a short to battery condition. Short

to battery protection disconnects the channel from its supply rail to guarantee that no

adverse condition occurs within the IC. The channel in short to battery is not shutdown by

this condition. Other channels are not affected in case of short of one output pin.

The sensor interface of RSULx(x=0,1,2,3) also offers open condition (only in ON state) and

short to ground detection (only in OFF state). The channel in this condition is not shutdown.

If there is open circuit for RSUHx, it will be detected by open detection of corresponding

RSULx if the sensor is still connected to RSULx.

The short to ground detection is implemented with a pull-up current (IRSUL_PU) and a

voltage comparator (VSTGTH) on RSULx (x=0,1,2,3). Requirement is that external short to

Table 39. RSU_STATUS register

ADDR

NAME

TYPE

BITS = 8

0001010

RSU_STATUS

LS Over Current and Short to ground Status

Table 40. RSU_STATUS register bit description

Data Field

Description

Reset Value

TYPE

Bit 7:4

LS OVER CURRENT channels 3:0.

(Active if the wss LS are ON)

0 => NO FAULT

1 => FAULT

SSM_RESET

LBIST

Bit 3:0

LS Short To Ground channels 3:0.

(Active if the wss LS are OFF)

0 => NO FAULT

1 => FAULT

SSM_RESET

LBIST

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