L99MD01 datasheet(9/54 Pages) STMICROELECTRONICS

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L99MD01

Detailed description

Doc ID 17242 Rev 6

9/54

2.9

Temperature warning and thermal shutdown

If the junction temperature rises above TjTW ON a temperature warning flag is set and is

detectable via the SPI. If the junction temperature increases above the second threshold

TjSD ON, the thermal shutdown bit is set and power DMOS transistors of all output stages

are switched off to protect the device. Temperature warning flag and thermal shutdown bits

are latched. In order to reactivate the output stages, the junction temperature must

decrease below TjSD ON and the thermal shutdown bit has to be cleared by the

microcontroller.

2.10

VS, VS2, VSA, VSB monitoring

VS undervoltage:

Status bit is set. All outputs and SMPS are switched off.

The microcontroller needs to clear the status bits to reactivate the

drivers and SMPS.

VS overvoltage:

Status bit is set. All outputs are switched off (default).

The microcontroller needs to clear the status bits to reactivate the

drivers Can be deactivated via SPI.

VSA undervoltage:

Status bit is set. Out 1 to Out 8 are switched off.

The microcontroller needs to clear the status bits to reactivate the

drivers.

VSB undervoltage:

Status bit is set. Out 1 to Out 8 are switched off.

The microcontroller needs to clear the status bits to reactivate the

drivers.

VS2 undervoltage:

Status bit is set. Only if SPMS is active.

The microcontroller needs to clear the status bits to reactivate SMPS

VS2 overvoltage:

Status bit is set. SMPS is switched off (default).

The microcontroller needs to clear the status bits to reactivate

SMPS. If the VS2 recovery bit is set, and the VS2 voltage falls below

the threshold, the SMPS goes in active mode and the status bit is

cleared.

Table 2.

VS, VS2, VSA, VSB monitoring

‘typ

SMPS

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

VS2 undervoltage

VS + 1.5V

Status

VS2 overvoltage

35.0 V

Status + (off or (off+ recovery))

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