33797 datasheet(4/34 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33797

PIN CONNECTIONS

SENSE_1B

Input

Squib Sense 1B

Used during standard applications involving a four-channel

squib driver IC and during cross-coupling applications involving

two four-channel squib driver ICs (squib driver IC #1 and squib

driver IC #2).

SQB_LO_1B

Output

Squib Lo 1B

Drain of the low-side switch that connects to the low pin of

Squib_1B

SQB_LO_2B

Output

Squib Lo 2B

Drain of the low-side switch that connects to the low pin of

Squib_2B

SENSE_2B

Input

Squib Sense 2B

Used during standard applications involving a four-channel

squib driver IC and during cross-coupling applications involving

two four-channel squib driver ICs (squib driver IC #1 and squib

driver IC #2).

R_LIMIT_2

Output

Limit Resistor - 2A

and 2B

External resistor to ground is used to set current limit for

Squib_2A and squib_2B FET drivers.

FEN_2

Input

FET Driver 2A

and 2B

Active high input signal to enable operation of the squib_2A and

Squib_2B FET drivers.

SQB_HI_2B

Output

Squib Hi 2B

Drain of the high-side switch that connects to the low pin of

Squib_2B.

VFIRE_2B

Supply

Squib Firing Supply

Firing supply pin for squib_2B.

R_DIAG

Input

Limit Resistor -

Diagnostic

External resistor to ground is used to set the diagnostic current

for squib resistance.

VFIRE_RTN

Ground

Squib Fire Power

Ground

Power Ground for squibs 1A, 1B, 2A, and 2B

VFIRE_RTN

Ground

Squib Fire Power

Ground

Power Ground for squibs 1A, 1B, 2A, and 2B

VDIAG_2

Supply

Squib Diagnostic 2A

and 2b

Diagnostic pin for high-side safing sensor for squibs 2A and 2B

and the VFIRE supply voltage.

VFIRE_2A

Supply

Squib Firing Supply

Firing supply pin for squib_ 2A

SQB_HI_2A

Output

Squib Hi 2A

Drain of the high-side switch that connects to the low pin of

Squib_2A

RST

Input

Reset

Reset, Active Low

Input

Chip Select

Chip Select for SPI interface, Active Low

SENSE_2A

Input

Squib Sense 2A

Used during standard applications involving a four-channel

squib driver IC or during cross-coupling applications involving

two four-channel squib driver ICs (squib driver IC #1 and squib

driver IC #2).

SQB_LO_2A

Output

Squib Lo 2A

Drain of the low-side switch that connects to the low pin of

Squib_2A

Table 1. Pin Function Description (continued)

Pin Name

Pin Function

Formal Name

Pin Description

33797 Datasheet(PDF) 4 Page - Freescale Semiconductor, Inc

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