L99PM72PXP datasheet(45/128 Pages) STMICROELECTRONICS

45 / 128 page

L99PM72PXP

Protection and diagnosis

Doc ID 023553 Rev 3

45/128

3.3

High side driver outputs

The component provides a total of 4 high side outputs Out1...4, (7

 typ. at 25°C) to drive

e.g. LED's or hall sensors and 1 high side output OUT_HS with 1  typ. at 25°C).

●

The high side outputs switch off in case of:

●

VS overvoltage and undervoltage

●

Overcurrent

●

Overtemperature (TSD1) with pre warning(c)

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

according status bit is latched and can be read and optionally cleared by SPI. The drivers

remain off until the status is cleared.

In case overvoltage or undervoltage condition, the drivers are switched off. The according

status bit is latched and can be read and optionally cleared by SPI. If the VLOCK_OUT_EN

bit (Control Register 4) is set to ‘1’ the drivers remain off until the status is cleared. If the

VLOCK_OUT_EN bit is set to ‘0’ the drivers switch on automatically if the error condition

disappears.

In case of open load condition, the according status register is latched. The status can be

read and optionally cleared by SPI. The High sides are not switched off.

For OUT_HS the auto recovery feature (OUTHS_rec_en bit Control Register 4) can be

enabled. If this bit is set to ‘1’ the driver automatically restarts from a overload condition.

This overload recovery feature is intended for loads which have an initial current higher than

the over current limit of the output (e.g. Inrush current of cold light bulbs). During auto

recovery mode the over current status bit can not be read from SPI.

The device itself cannot distinguish between a real overload and a non linear load like a light

bulb. A real overload condition can only be qualified by time. As an example, the micro

controller can switch on light bulbs by setting the over current recovery bit for the first 50 ms.

After clearing the recovery bit, the output is automatically disabled if the overload condition

still exists.

In case of a fail safe condition, the high side drivers are switched off. The control bits are set

to default values. (except OUT3/FSO if it is used as a High Side Driver Output)

Note:

The maximum voltage and current applied to the High Side Outputs is specified in 2.1

‘Absolute Maximum Ratings’. Appropriate external protection may be required in order to

respect these limits under application conditions.

Each high side driver can be driven whether with a PWM signal or with a internal Timer (see

Table 8).

For more details please refer to Section 6.2.3: Control Register 1

Except OUT3 when configured as FSO

Table 8.

PWM configuration for high-side outputs

High side output

PWM channel

Internal timer

OUT1

PWM 1

Timer 1

OUT2

PWM 2

Timer 2

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