L9659 datasheet(44/51 Pages) STMICROELECTRONICS

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Functional description

L9659

44/51

Doc ID 022048 Rev 2

The DEPLOY_SUCCESSx flag indicates if the corresponding channel’s drivers were

activated and that the activation period has completed. This bit is set when the activation

period has expired. The DEPLOY_SUCCESSx flag will be ‘1’ until it is cleared by writing a

‘1’ to the appropriate channel(s) (bits D7-D0).

The DEPLOY_STATUSx bit will become ‘1’ when there is a valid Arm and Fire sequence for

the corresponding channel. The DEPLOY_STATUSx bit transitioning from a ‘0’ to a ‘1’ does

not depend on the state of the FEN function. It will become ‘0’ when time out has expired.

Depending on the state of FEN the DEPLOY_STATUSx flag could be ‘1’ for a minimum of 1x

tDEPLOY and a maximum of up to 2 x tDEPLOY (see Figure 8.). The Deployment status is

captured on the falling edge of CS_D.

Bit D8 is used to select the meaning of bit D7 through bit D0 in the status response

message. When this bit is set to ‘1,’ bits D7 through D0 in the status response message will

report the state of the DEPLOY_STATUSx flag.

When this bit is ‘0,’ bit D7 through bit D0 in the status response message will report the

DEPLOY_SUCCESSx flag. The following table shows the conditions for the

DEPLOY_STATUSx flag and the DEPLOY_SUCCESSx flag.

Once the Deploy Success Flag is set, it will inhibit the subsequent deployment command

until a SPI command to clear this deployment success flag is received. Bits D7 through bit

D0 are used to clear/keep the deploy success flag. When these bits are set to ‘1,’ the flag

can be cleared. Otherwise, the state of these flags is not affected. The Success flag must

be cleared to allow re-activation of the drivers

Keep Deploy Success Flag Channel 2

(default)

Deploy Information for channel based on bit D8

Will Either be DEPLOY_STATUS2 or

DEPLOY_SUCCESS2

Clear Deploy Success Flag Channel 2

Keep Deploy Success Flag Channel 1

(default)

Deploy Information for channel based on bit D8

Will Either be DEPLOY_STATUS1 or

DEPLOY_SUCCESS1

Clear Deploy Success Flag Channel 1

Keep Deploy Success Flag Channel 0

(default)

Deploy Information for channel based on bit D8

Will Either be DEPLOY_STATUS0 or

DEPLOY_SUCCESS0

Clear Deploy Success Flag Channel 0

Table 26.

MOSI diagnostic mode 1 bit definition

Bit

MOSI Command

MISO Response

State

Description

Table 27.

DEPLOY_STATUSx flag and the DEPLOY_SUCCESSx flag conditions

DEPLOY_STATUSx flag

DEPLOY_SUCCESSx flag

Description

No Deployment in process or has been

initiated since POR or since last Clear of

Success flag

Deployment has successfully completed

Deployment in process

Deployment terminated / LSD shutdown

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