L9658 datasheet(34/64 Pages) STMICROELECTRONICS

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Functional description

L9658

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Doc ID 14219 Rev 3

Bit D9 and bit D8 are used to set the period of pulse stretch timer.

The device have 8 independent timers. Either a valid arming signal or a SPI deployment

command is able to start the pulse stretch timer. These bits will set the timer duration. These

values default to %00 after a POR event.

Bit D7 through bit D0 will be used for a soft reset sequence. The soft reset for the

deployment driver is achieved by writing $AA and $55 within two subsequent 16-bit SPI

transmissions. If he sequence is broken, the processor will be required to re-transmit the

sequence.

L9658 does not reset if the sequence is not completed within two subsequent 16-bit SPI

transmissions. This soft reset function is available only to deployment drivers.

When soft reset command is received, the deice reset its deployment driver’s internal logic

and timer. The effects of soft reset to the deployment driver is the same as ones of POR

event, except MISO response.

During a deployment, soft reset sequence is ignored.

4.11.3

Deployment driver command mode

Command Mode message is defined as shown below.

Table 17.

Pulse stretch timer

Bit D9

Bit D8

Stretch period (ms)

7.5

Table 18.

MOSI command mode message definition

Bit

State

Description

D15

Mode Bits

D14

D13

Odd Parity

D12

Don’t Care

D11

Don’t Care

D10

Don’t C are

Don’t Care

Channel 7 Idle (default)

Deploy Channel 7

Channel 6 Idle (default)

Deploy Channel 6

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