L99MD02 datasheet(9/46 Pages) STMICROELECTRONICS

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L99MD02

Overview

Doc ID 16082 Rev 5

9/46

2.9

VS, VSA, VSB monitoring

2.10

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 for at least 2 ms (tdOL) the corresponding

open-load bit is set in the status register.

Due to mechanical/electrical inertia of typical loads a short activation of the outputs (e.g.

3 ms) can be used to test the open-load status without changing the mechanical/ electrical

state of the loads.

2.11

Overload detection

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

overcurrent signal is valid for at least tISC = 32 µs, the overcurrent flag is set and the

corresponding switch is switched off to reduce the power dissipation and to protect the

integrated circuit. The microcontroller has to clear the status bit to reactivate the

corresponding driver.

2.12

Cross-current protection

The device is cross-current protected by an internal delay time. If one driver (LS or HS) is

turned-off the activation of the other driver of the same half bridge will be automatically

delayed by the cross-current protection time. After the cross-current protection time is

expired the slew-rate limited switch-off phase of the driver will be changed to a fast turn-off

phase and the opposite driver is turned-on with slew-rate limitation. Due to this behavior it is

VS undervoltage:

Status bit will be set. Have to be cleared via SPI.

All outputs will be switched off.

VS overvoltage:

Status bit will be set. Has to be cleared via SPI.

All outputs will be switched off (default). Can be deactivated via SPI.

VSA undervoltage:

Status bit will be set. Has to be cleared via SPI.

Out 1 to Out 6 will be switched off.

VSB undervoltage:

Status bit will be set. Has to be cleared via SPI.

Out 1 to Out 6 will be switched off.

Table 2.

VS, VSA, VSB monitoring

‘typ

Out x

VS undervoltage

5.7 V

Status + off

VS overvoltage

22.0 V

Status + (off or mask)

VSA undervoltage

5.7 V

Status + off

VSB undervoltage

5.7 V

Status + off

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