33797 datasheet(11/34 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33797

ELECTRICAL CHARACTERISTICS

STATIC ELECTRICAL CHARACTERISTICS

R_HS Short Threshold

RHSS

2.8

–

4.1

κΩ

VFIRE_XA & VFIRE_XB Current during High Side Safing Test at Open

Threshold

VFIRE_1A & VFIRE_1B or VFIRE_2A & VFIRE_2B

I1HSO

270

360

410

µA

VFIRE_XA & VFIRE_XB Current during High Side Safing Test at Short

Threshold

VFIRE_1A & VFIRE_1B or VFIRE_2A & VFIRE_2B

I1HSS

287

385

436

µA

HIGH-SIDE SAFING SENSOR DIAGNOSTICS WITH 1 SAFING SENSOR IN FIRING PATH CONNECTED TO VFIRE_1A AND VFIRE_2A

PINS (GUARANTEED BY DESIGN) ($C0 COMMAND)

Total VFIRE_XX Current during High Side Safing Test at Open Threshold

VFIRE_1A, VFIRE_1B, VFIRE_2A & VFIRE_2B pins

I2HSO

574

705

835

µA

Total VFIRE_XX Current during High Side Safing Test at Short Threshold

VFIRE_1A, VFIRE_1B, VFIRE_2A & VFIRE_2B pins

I2HSS

605

748

892

µA

R_HS Valid Resistor Range

15 V

≤ V

VDIAG_X ≤ 35 V

R2HS

1.99

–

2.93

Ω

R_HS Open Threshold

15 V

≤ V

VDIAG_X ≤ 35 V

R2HSO

2.93

3.35

4.43

Ω

R_HS Short Threshold

15 V

≤ V

VDIAG_X ≤ 35 V

R2HSS

1.41

1.61

1.99

Ω

R_LIMIT RESISTOR DIAGNOSTICS ($C8 COMMAND)

R_LIMIT Valid Resistor Range

RRL

4.32

–

45.3

Ω

R_LIMIT Open Threshold (“Out of Range Threshold”)

RRLO

105

Ω

R_LIMIT Short-to-Ground Threshold (“Out of Range Threshold”)

RRLS

3.0

3.5

4.31

Ω

Maximum External Capacitance to Ground

CRL

–

R_DIAG RESISTOR DIAGNOSTICS ($C8 COMMAND) (17)

R_DIAG Valid Resistor Range

RRD

8.0

–

Ω

R_DIAG Open Threshold (“Out of Range Threshold”)

RRDO

Ω

R_DIAG Short-to-Ground Threshold (“Out of Range Threshold”)

RRDS

3.0

5.4

8.0

Ω

Maximum External Capacitance to Ground

CRD

–

Notes

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

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.

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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