33797 datasheet(3/34 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33797

PIN CONNECTIONS

Figure 4. Pin Function Description

SQB_LO_2A

SQB_HI_2A

VFIRE_2A

VDIAG_2

VFIRE_RTN

R_DIAG

VFIRE_2B

SQB_HI_2B

FEN_2

SENSE_2B

SQB_LO_2B

R_LIMIT_2

RST

SENSE_2A

SQB_LO_1A

SQB_HI_1A

VFIRE_1A

VDIAG_1

GND

MISO

VDD

VFIRE_1B

SQB_HI_1B

FEN_1

SENSE_1B

SQB_LO_1B

R_LIMIT_1

CLK

SENSE_1A

MOSI

Table 1. Pin Function Description

Pin Name

Pin Function

Formal Name

Pin Description

SQB_LO_1A

Output

Squib Lo 1A

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

Squib_1A

SENSE_1A

Input

Squib Sense 1A

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).

MOSI

Input

Data Input 1

Serial data input for SPI interface.

CLK

Input

Serial Clock

Serial clock input for SPI interface.

SQB_HI_1A

Output

Squib Hi 1A

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

Squib_1A

VFIRE_1A

Supply

Squib Firing Supply

Firing supply pin for Squib_1A.

VDIAG_1

Input

Squib Diagnostic 1A

and 1A

Diagnostic pin for high-side safing sensor for squibs 1A and 1B

and the VFIRE supply voltage.

GND

Ground

Device Ground

Device ground pin for internal logic and diagnostic circuitry.

MISO

Output

Data Output 0

Serial data output for SPI interface.

VDD

Input

Logic Power

Device power pin for internal logic and diagnostic circuitry.

VFIRE_1B

Supply

Squib Firing Supply

Firing supply pin for Squib_1B.

SQB_HI_1B

Output

Squib Hi 1B

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

Squib_1B

FEN_1

Input

FET Driver 1A and

Active high input signal to enable operation of the squib_1A and

Squib_1BFET drivers.

R_LIMIT_1

Output

Limit Resistor - 1A

and 1B

External resistor to ground is used to set current limit for

Squib_1A and squib_1B FET drivers.

33797 Datasheet(PDF) 3 Page - Freescale Semiconductor, Inc

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