33797 Datasheet, PDF (9/34 Pages) Freescale Semiconductor, Inc – Four Channel Squib Driver IC

ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. Static Electrical Characteristics (continued)
Characteristics noted under conditions 4.75 V ≤ V_DD ≤ 5.25 V; 7.0 V ≤ V_{VFIRE_XX} ≤ 35 V; V_{VDIAG_X} = V_{VFIRE_XX}; FEN 1 = FEN 2
= V_DD; R_{R_LIMIT_X} = 10 kΩ ±1%, R_{R_DIAG} = 10 kΩ ±1%, -40°C ≤ T_A ≤ +85°C, GND = 0 unless otherwise noted. Typical values
noted reflect the approximate parameter means at T_A = 25°C under nominal conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max
Unit
RST INPUT PIN (ACTIVE LOW) ⁽¹¹⁾
System Reset Threshold
V_DDRST
–
–
4.1
V
Internal Current Pull-Down
I_RST
-6
-10
-15
µA
RST Logic Low Level
V_RST(LO)
0.0
2.5
0.35 x V_DD V
RST Logic High Level
SQUIB DIAGNOSTICS ($D0–$D3 COMMANDS) ⁽¹²⁾
V_RST(HI)
0.65 x V_DD
2.5
1.0 x V_DD
V
Diagnostic Current Through Squib ⁽¹³⁾
Resistance Threshold 1 ⁽¹³⁾
Resistance Threshold 2 ⁽¹³⁾
Resistance Threshold 3 ⁽¹³⁾
Resistance Threshold 4 ⁽¹³⁾
Resistance Threshold 5 ⁽¹³⁾
Resistance Threshold 6 ⁽¹³⁾
Resistance Threshold 7 ⁽¹³⁾
Resistance Threshold 8 ⁽¹³⁾
I_DIAG
R_TH1
R_TH2
R_TH3
R_TH4
R_TH5
R_TH6
R_TH7
R_TH8
30
34
40.5
mA
1.2
1.4
1.6
Ω
1.6
1.8
2.1
Ω
2.1
2.4
2.6
Ω
2.6
2.9
3.2
Ω
3.3
3.7
4.4
Ω
4.6
5.4
6.0
Ω
5.7
6.5
7.1
Ω
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 V_PWR
7.0 V ≤ V_{VDIAG_X} ≤ 35 V
V_THSB
V
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
Current Sink Shorts Measurements I_SQB_LO_XX ⁽¹⁴⁾
1.0 V ≤ SENSE_XX ≤ 16 V, Typical = 800 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
V_THSG
I_SINKSHRTS
I_SOURSHRTS
1.3
-500
1.7
1.4
-800
3.5
V
1.6
µA
-900
mA
3.7
Voltage Threshold for SQB_LO or SQB_HI Shorted to V_PWR with an Open _{VTHSB_SO}
5.75
–
6.75
V
Squib using $C3 Command
R_SQUIB = Open
Notes
11 Reset Bar range of operation: The minimum system reset bar threshold/active will be set to “0” for a value of V_DD ≤ 4.1 V.
12 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.
13 R_{R_DIAG} = 10 kΩ ±1.0%
14 XX = 1A, 1B, 2A, or 2B.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33797
9