L9679E datasheet(71/127 Pages) STMICROELECTRONICS

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Config 1 (default): FENL is not used; FEN1 and FEN2 are enablers for any or all the loops, each input

controlling both HS and LS of those loops

•

Config 2: FENL is used and enables all LSs; FEN1 and FEN2 enable for any or all the loops, this time

controlling only HSs

FEN1/2 input pins are assigned to the desired channels by means of the programmable loop matrix.

Deploy commands in the Deploy Command Register (DEPCOM) are channel specific.

Deployment requires a valid arming condition from FENx signals to be set any time before, during or after the

specific sequence of deploy commands is received. It is feasible for a deploy command to be received without a

valid arming condition from the FENx being set. In this case, the deploy command will be terminated according to

the Section 7.1.2: Deploy command expiration timer

Arming signals coming from FENx pins are not stretched by the device so active state of these pins must be kept

during the entire duration of the deployment event to complete it successfully.

7.1.4

Deployment current monitoring

A current comparator is used to indicate when the output current from the HSD, SFx, exceeds the deployment

current threshold, ITHDEPL. The timer signal remains active and increments while the current meets the

programmed deploy current as set in the Deploy Configuration Register. The deployment current counter value is

stored in the Deploy Current Monitor Timer Register XY (DCMTSxy). There is a unique timer register for each

channel.

If the deploy current falls below the specified current threshold momentarily and recovers, the deployment current

counter will pause during the drop-out and continue once the current exceeds the threshold. The deployment

current counter will not be reset by the presence or absence of current in the deployment channel.

Figure 14. Current monitor counter behavior

I(SFx)

ITHDEPL

Normal

operation

Timer continues from t1

Timer pause

GADG0903181146PS

The deploy current counter is reset to $0000 as soon as a toggle on DEP_DISABLED is performed and a new

DEPCOM command on the same channel is received.

7.1.5

Deployment success

Deploy success flag is set when the deploy timer elapses. This bit (CHxDS) is contained in the Deploy Status

deployment channels sets a deploy success flag.

L9679E

Deployment drivers

DS12485 - Rev 8

page 71/127

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