L9654 datasheet(41/59 Pages) STMICROELECTRONICS

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L9654

Functional description

4.12.1

Deployment driver command mode response

Command Mode response is defined as shown here after.

Table 26. MISO command mode response definition

Bit

State

Description

D15

Mode bits

D14

D13

Don’t Care

D12

DEPEN Negated

DEPEN Asserted

D11

Don’t Care

D10

Don’t Care

ARM23 Negated

ARM23 Asserted

ARM01 Negated

ARM01 Asserted

Don’t Care

SPI Deploy Command Status: Channel 3

SPI Deploy Command Status: Channel 2

SPI Deploy Command Status: Channel 1

SPI Deploy Command Status: Channel 0

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

ARM status flag (bit D11 through bit D8) 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 shall not assert the arming status flag. This flag is negated as soon as the de-

glitch timer is expired. ARM status flag is an OR-function of arming states from two

channels.

SPI deploy command status flag indicates the SPI deployment status for the respective

channel. These flags reflect bit D3 through bit D0 of the most recent SPI command mode

message.

These bits do not include the status of pulse stretch timer. These bits are overwritten by the

most recent SPI command mode message.

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