33797 datasheet(9/34 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33797

ELECTRICAL CHARACTERISTICS

STATIC ELECTRICAL CHARACTERISTICS

RST INPUT PIN (ACTIVE LOW) (11)

System Reset Threshold

VDDRST

–

4.1

Internal Current Pull-Down

IRST

-6

-10

-15

µA

RST Logic Low Level

VRST(LO)

0.0

2.5

0.35 x VDD

RST Logic High Level

VRST(HI)

0.65 x VDD

2.5

1.0 x VDD

SQUIB DIAGNOSTICS ($D0–$D3 COMMANDS) (12)

Diagnostic Current Through Squib (13)

IDIAG

40.5

Resistance Threshold 1 (13)

RTH1

1.2

1.4

1.6

Ω

Resistance Threshold 2 (13)

RTH2

1.6

1.8

2.1

Ω

Resistance Threshold 3 (13)

RTH3

2.1

2.4

2.6

Ω

Resistance Threshold 4 (13)

RTH4

2.6

2.9

3.2

Ω

Resistance Threshold 5 (13)

RTH5

3.3

3.7

4.4

Ω

Resistance Threshold 6 (13)

RTH6

4.6

5.4

6.0

Ω

Resistance Threshold 7 (13)

RTH7

5.7

6.5

7.1

Ω

Resistance Threshold 8 (13)

RTH8

6.7

7.8

8.5

Ω

SQUIB SHORT-TO-BATTERY/GROUND DIAGNOSTICS AND SQUIB HARNESS SHORT-TO-BATTERY/GROUND DIAGNOSTICS WITH

AN OPEN SQUIB ($C1, $C3 COMMANDS)

Voltage Threshold for SQB_LO and SQB_HI Shorted to VPWR

7.0 V

≤ V

VDIAG_X ≤ 35 V

VTHSB

5.7

6.0

6.4

Voltage Threshold for SQB_LO and SQB_HI Shorted to Ground

7.0 V

≤ V

VDIAG_X ≤ 35 V

VTHSG

1.3

1.4

1.6

Current Sink Shorts Measurements I_SQB_LO_XX (14)

1.0 V

≤ SENSE_XX ≤ 16 V, Typical = 800 µA

ISINKSHRTS

-500

-800

-900

µA

Current Source Shorts Measurements I_SQB_HI_XX (14)

1.0 V

≤ SENSE_XX ≤ 16 V, 7.0 V ≤ V

VDIAG_X ≤ 35 V

ISOURSHRTS

1.7

3.5

3.7

Voltage Threshold for SQB_LO or SQB_HI Shorted to VPWR with an Open

Squib using $C3 Command

RSQUIB = Open

VTHSB_SO

5.75

–

6.75

Notes

Reset Bar range of operation: The minimum system reset bar threshold/active will be set to “0” for a value of VDD ≤ 4.1 V.

By changing the R_DIAG resistor value, the resistance thresholds can be varied in a linear relationship.The R_DIAG resistance can be

changed by ±10% to shift the thresholds by ±10%. Design goal for resistance threshold change is ±15%. R_DIAG threshold limit may

have to be changed to accommodate ±15% change. Example: Shifting the R_DIAG resistance value ±10%, the resistance threshold

will change by ±10%. Refer to Table 4, page 12.

RR_DIAG = 10 kΩ ±1.0%

XX = 1A, 1B, 2A, or 2B.

Table 3. Static Electrical Characteristics (continued)

Characteristics noted under conditions 4.75 V ≤ VDD ≤ 5.25 V; 7.0 V ≤ VVFIRE_XX ≤ 35 V; VVDIAG_X = VVFIRE_XX; FEN 1 = FEN 2

= VDD; RR_LIMIT_X = 10 kΩ ±1%, RR_DIAG = 10 kΩ ±1%, -40°C ≤ TA ≤ +85°C, GND = 0 unless otherwise noted. Typical values

noted reflect the approximate parameter means at TA = 25°C under nominal conditions unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

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