L9662TR datasheet(32/80 Pages) STMICROELECTRONICS

32 / 80 page

Functional description

L9662

32/80

DocID028325 Rev 1

Figure 8. Driver activation timing diagram

Only the channels selected in the ARM and, directly following, the FIRE command will be

able to be activated.

By reading the appropriate registers a status of the deployment is provided. If a valid

Arm/Fire sequence has been provided the status flag will become active. This flag shall

remain active for as long as the TDEPLOY timer is counting. Depending on the state of the

FEN function the DEPLOY_STATUS flag will be active a minimum of TDEPLOY and a

maximum of 2 x TDEPLOY. If driver activation did occur (both a valid Arm/Fire sequence

and the appropriate FEN function active within the appropriate time) then the

DEPLOY_SUCCESS flag will be active. This flag will be active until cleared by software. If a

valid Arm/Fire sequence did occur but the FEN function was never activated within the

TDEPLOY time then the DEPLOY_SUCCESS flag will remain ‘0’.

During driver activation the respective high side (SQHx) and low side (SQLx) drivers will

turn on for tDEPLOY.

Device driver activation will not occur or, if firing is in process, will terminate under the

following conditions:



Power On Reset (POR)



IREF resistance is larger than RIREF_H or smaller than RIREF_L



Loss of ground condition on GND pin

The following conditions are ignored when driver activation is in-progress:



RESETB



Valid soft reset sequences



SPI1 commands except as noted below Response for ignored commands will be

0xD009



FEN function

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