L9660 datasheet(42/49 Pages) STMICROELECTRONICS

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Functional description

L9660

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DocID024714 Rev 2

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

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

expired. The DEPLOY_SUCCESSx flag is ‘1’ until it is cleared by writing a ‘1’ to the

appropriate channel(s) (bits D3-D0).

The DEPLOY_STATUSx bit becomes ‘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 becomes ‘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 D3 through bit D0 in the status response

message. When this bit is set to ‘1,’ bits D3 through D0 in the status response message

report the state of the DEPLOY_STATUSx flag.

When this bit is ‘0,’ bit D3 through bit D0 in the status response message report the

DEPLOY_SUCCESSx flag. The following table shows the conditions for the

DEPLOY_STATUSx flag and the DEPLOY_SUCCESSx flag.

Once set, the Deploy Success Flag inhibits the subsequent deployment command until a

SPI command to clear this deployment success flag is received. Bits D3 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.

Table 27. DEPLOY_STATUSx flag and 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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