L9654 datasheet(43/59 Pages) STMICROELECTRONICS

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L9654

Functional description

AOUT/Comparator channel select bits (bit D6..4) indicate which channel is being monitored

by AOUT or SBTH, SGTH, VI_TH comparators.

VI_TH threshold status flag (bit D3) indicates the state of VI_TH comparator. VI_TH comparator

monitors the voltage across SQH and SQL pins.

Diagnostic current channel select bits (bit D2..0) indicate which channel is being applied by

the diagnostic current.

4.12.3

Deployment driver status response

Status response is defined as in the following table.

Table 28. MISO status response definition

Bit

State

Description

D15

Mode bits

D14

D13

Always 0

D12

DEPEN Negated

DEPEN Asserted

D11

Don't care

D10

Don't care

ARM23 Negated

ARM23 Asserted

ARM01 Negated

ARM01 Asserted

Don't care

No Deployment Event: Channel 3

Deploy Status: Channel 3

No Deployment Event: Channel 0

Deploy Status: Channel 0

DEPEN status flag (bit D12) indicates the state of DEPEN pin.

ARM status flag indicates the state of the respective arming signal, including the pulse

stretch timer. If the pulse stretch timer is initiated by a deployment command, it does not

assert the arming status flag. This flag is de/asserted as soon as the de-glitch timer is

expired.

Deploy status bits (bit D3 through bit D0) report the status of internal deployment. Bit D8 in

the monitor mode command determines which status information device needs to be

reported in D3 through bit D0.

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