L9026 datasheet(18/60 Pages) STMICROELECTRONICS

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6.10

Limp Home mode

L9026 is brought into Limp Home mode when one of the two input pins is asserted (this means the enabling of the

channel connected to it) and also the idle pin is set to "low". SPI communication is possible but in read-only mode

(SPI registers can be read but it is not possible write into them).

Limp Home mode has the following effects:

•

IN0 is mapped as channel 2 input command, IN1 is mapped as channel 3 input command.

•

Overload and overtemperature diagnostics on channel 2 and 3 are available and the related

DIAG_OVC_OVT bits can be read.

During the transition from Limp-Home mode to Sleep, the complete set of L9026 registers is not accessible for

writing until it remains in the Limp Home state and are set to their default values.

The SPI works only in read mode, in this case a special feature is performed for channel 2 and 3 and the

channels can be configured as HS or LS depending on the external load.

Open in ON diagnosis is not performed in Limp Home mode. This is true also if Limp Home mode has been

entered from Active mode and DIAG_OPL_ON_EN.OUTn bits are set to '1'. In this case, the diagnostic cycles will

be performed only when back in ACTIVE mode.

Refer to Table 10. Functions availability in different supply conditions for a detailed description of supply voltage

conditions required to switch ON channels 2 and 3 during Limp Home, the other channels are kept OFF.

6.11

Power supply transition

The time to turn on a channel is defined as tON both in Active and Limp Home mode. In all other cases, the

transition time is reported in Figure 7.

Figure 7. Transition times block diagram

Limp home mode

Sleep Mode

Idle mode

tIDLE2SLEEP

tACTIVE2SLEEP

tSLEEP2IDLE

tIDLE2ACTIVE

tACTIVE2IDLE

tLH2ACTIVE

tACTIVE2LH

tLH2SLEEP

tSLEEP2LH

Active Mode

L9026

Power supply

DS13397 - Rev 9

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