Analog Integrated Circuit Device Data

Freescale Semiconductor

11

33797

ELECTRICAL CHARACTERISTICS

STATIC ELECTRICAL CHARACTERISTICS

R_HS Short Threshold

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

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

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

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

605

748

892

µA

R_HS Valid Resistor Range

15 V

≤ V

1.99

–

2.93

k

Ω

R_HS Open Threshold

15 V

≤ V

2.93

3.35

4.43

k

Ω

R_HS Short Threshold

15 V

≤ V

1.41

1.61

1.99

k

Ω

R_LIMIT RESISTOR DIAGNOSTICS ($C8 COMMAND)

R_LIMIT Valid Resistor Range

4.32

–

45.3

k

Ω

R_LIMIT Open Threshold (“Out of Range Threshold”)

60

76

105

k

Ω

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

3.0

3.5

4.31

k

Ω

Maximum External Capacitance to Ground

–

–

20

pF

R_DIAG RESISTOR DIAGNOSTICS ($C8 COMMAND) (17)

R_DIAG Valid Resistor Range

8.0

–

13

k

Ω

R_DIAG Open Threshold (“Out of Range Threshold”)

13

23

60

k

Ω

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

3.0

5.4

8.0

k

Ω

Maximum External Capacitance to Ground

–

–

20

pF

Notes

17

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)

Characteristic

Symbol

Min

Typ

Max

Unit