L9659 datasheet(35/51 Pages) STMICROELECTRONICS

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L9659

Functional description

Doc ID 022048 Rev 2

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Bits [D9:D8]

Bits are used to set the period of the FEN latch timer. The L9659 has

4 independent timers. A valid FENx input will start the pulse stretch

timer. These bits will set the timer duration. These values default to

‘00’ after a POR event.

Deployment commands

The deployment mode is used to activate the drivers. Two consecutive commands are

required to activate the drivers. Any combination of channels can be fired as long as the

prerequisite conditions are met as indicated in the previous section.

The SPI message definition for MOSI commands and MISO responses in Deployment Mode

are defined below.

FEN latch time

00 = 0ms (default)

01 = 128ms

10 = 256ms

11 = 512ms

Internal Stored Value FEN latch bits

D7 – D0

See above

Table 17.

Configuration mode 2

Bit

MOSI command

MISO response

State

Description

MSB

LSB

D15

D14

D13

D12

D11

D10

MOSI Command for Deployment Mode 1

Arming Channel Select

MISO Response for Deployment Mode 1

Armed Channels

MOSI Command for Deployment Mode 2

Firing Channel Select

MISO Response for Deployment Mode 2

Channels activated or

channels waiting for FEN

input

Table 18.

Deployment mode 1 bit definition

Bit

MOSI command

MISO response

State

Description

D15

Mode Bits

See above

D14

See above

D13

Odd Parity – Includes all 16 bits

D12 – D8

Arm pattern

See above

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