SPSB081 datasheet(37/137 Pages) STMICROELECTRONICS

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3.15

Power outputs OUT1..4

The component provides a total of four standalone high side outputs OUT1, OUT2, OUT3, and OUT4 to drive, for

example, LED’s or to supply contacts. OUT1, OUT2, OUT3, and OUT4 are supplied by VS. OUT1, OUT2, OUT 3

and OUT4 are intended to be used as contact supply and can be activated in standby modes.

All high side outputs switch off in case of:

•

VS overvoltage and undervoltage (depending on configuration, see Section 3.13 Power supply fail)

•

Overcurrent (only the impacted high-side)

•

Overtemperature (TSD1)

•

Fail-safe event

•

Loss of ground at SGND pin

In the case of overcurrent or overtemperature (TSD1 (SR1)) condition, the drivers will switch off. The related

status bit is latched and can be read and optionally cleared by SPI. The drivers remain off until the status is

cleared.

In case of overvoltage and undervoltage conditions, the drivers are switched off. The relative status bit is latched

and can be read and optionally cleared by SPI. If the VS_LOCK_EN bit is set to ‘1’, the drivers remain off

until the status is cleared. If the VS_LOCK_EN bit is set to ‘0’, the drivers switch on automatically if the error

condition disappears. Under-voltage and over-voltage shutdown can be disabled by setting < VS_UV_SD_EN >

respectively < VS_OV_SD_EN > to ‘0’. In case of open load condition, the appropriate status register (in SR4) is

set. The status can be read and optionally cleared by SPI. The high side outputs are not switched off in case of

open load condition.

Note:

The maximum voltage and current applied to the high-side outputs are specified in the ‘absolute maximum

ratings’. Appropriate external protection may be required in order to respect these limits under application

conditions.

Each of the standalone high-side driver outputs OUT1..4 can be also driven either with an internal generated

PWM signal or with an internal timer. OUT1..4 can be also directly driven with DIR/WU2 pin.

3.16

Open-load detection

The open-load detection monitors the load current in each activated output stage. If the load current is below

the open- load detection threshold (IOLDx) for at least tFOL the corresponding open-load bit is set in the status

3.17

Overcurrent detection

In the case of an overcurrent condition, a status flag is set in the corresponding status register. If the overcurrent

signal is valid for at least tBLK, the overcurrent flag is set and the corresponding driver switches off to reduce the

power dissipation and to protect the integrated circuit. If the overcurrent recovery bit of the output is cleared, the

microcontroller has to clear the status bits to reactivate the corresponding driver.

3.18

Current monitor

The current monitor sources a current image of the power stage output current at the current monitor pin, which

has fixed ratio (ICMR refer to Table 34) of the instantaneous current of the selected high-side driver. The signal

at output CM is blanked after switching on the driver until correct settlement of the circuitry. The bits CM_SEL_x

(CR6) define which of the outputs is multiplexed to the current monitor output CM. The current monitor output

allows a more precise analysis of the actual state of the load rather than the detection of an open or overload

condition. The current monitor output is enabled after the current-monitor blanking time, when the selected output

is switched on. If this output is off, the current monitor output is in high-impedance mode. The current monitor can

be turned on or off by selecting the corresponding setting for the CM on/off bit.

SPSB081

Power outputs OUT1..4

DS14048 - Rev 3

page 37/137

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