L99MM70XP datasheet(29/68 Pages) STMICROELECTRONICS

29 / 68 page

L99MM70XP

Protection and diagnosis

Doc ID 022637 Rev 2

29/68

If the output current exceeds the current shutdown threshold the output transistor is turned

off and the corresponding diagnosis bit of the output is latched. The status can be read and

cleared from SPI. If the overcurrent recovery mode is set for this output, the output is

switched on again in order to provide a soft start function (see Section 3.10.5:

Programmable soft start function) and the status bit is cleared automatically. Otherwise the

output stays off until the status bit is cleared.

The outputs are automatically switched off in case of passive mode, VS undervoltage, VS

overvoltage, thermal shutdown (TSD1 and TSD2) or stuck at 1/0 condition at DI.

4.5

High-side driver outputs

The device provides a total of 4 high-side outputs OUT6,7,8,9 to drive LED or defroster.

The high-side outputs are protected against

●

Overvoltage and undervoltage (can be masked by SPI)

●

Overload (short circuit)

●

Overtemperature with pre warning

If the output current exceeds the current shutdown threshold the output transistor is turned

off and the corresponding diagnosis bit of the output is latched. The status can be read and

cleared from SPI. If the overcurrent recovery mode is set for this output, the output is

switched on again in order to provide a soft start function (see Section 3.10.5:

Programmable soft start function) and the status bit is cleared automatically. Otherwise the

output stays off until the status bit is cleared.

The outputs are automatically switched off in case of passive mode, VS undervoltage, VS

overvoltage, thermal shutdown (TSD1 and TSD2) or stuck at 1/0 condition at DI.

Note:

Loss of ground or ground shift with externally grounded loads: ESD structures are

configured for nominal currents only. If external loads are connected to different grounds, the

current load must be limited to this nominal current.

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