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MC33797 Fiches technique(PDF) 8 Page - Freescale Semiconductor, Inc

No de pièce MC33797
Description  Four Channel Squib Driver IC
Download  32 Pages
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Fabricant  FREESCALE [Freescale Semiconductor, Inc]
Site Internet  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC33797 Fiches technique(HTML) 8 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
8
Freescale Semiconductor
33797
STATIC ELECTRICAL CHARACTERISTICS
RST INPUT TERMINAL (ACTIVE LOW) (12)
System Reset Threshold
VDDRST
––
4.1
V
Internal Current Pull-Down
IRST
-6
-10
-15
µA
RST Logic Low Level
VRST(LO)
0.0
2.5
0.35 x VDD
V
RST Logic High Level
VRST(HI)
0.65 x VDD
2.5
1.0 x VDD
V
SQUIB DIAGNOSTICS ($D0–$D3 COMMANDS) (13)
Diagnostic Current Through Squib (14)
IDIAG
30
34
40.5
mA
Resistance Threshold 1 (14)
RTH1
1.2
1.4
1.6
Resistance Threshold 2 (14)
RTH2
1.6
1.8
2.1
Resistance Threshold 3 (14)
RTH3
2.1
2.4
2.6
Resistance Threshold 4 (14)
RTH4
2.6
2.9
3.2
Resistance Threshold 5 (14)
RTH5
3.3
3.7
4.4
Resistance Threshold 6 (14)
RTH6
4.6
5.4
6.0
Resistance Threshold 7 (14)
RTH7
5.7
6.5
7.1
Resistance Threshold 8 (14)
RTH8
6.7
7.8
8.5
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
≤ VVDIAG_X ≤ 35 V
VTHSB
5.7
6.0
6.4
V
Voltage Threshold for SQB_LO and SQB_HI Shorted to Ground
7.0 V
≤ VVDIAG_X ≤ 35 V
VTHSG
1.3
1.4
1.6
V
Current Sink Shorts Measurements I_SQB_LO_XX (15)
1.0 V
≤ SENSE_XX ≤ 16 V, Typical = 800 µA
ISINKSHRTS
-500
-800
-900
µA
Current Source Shorts Measurements I_SQB_HI_XX (15)
1.0 V
≤ SENSE_XX ≤ 16 V, 7.0 V ≤ VVDIAG_X ≤ 35 V
ISOURSHRTS
1.7
3.5
3.7
mA
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
V
Notes
12.
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.
13.
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 11.
14.
RR_DIAG = 10 kΩ ±1.0%
15.
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 =10kΩ ±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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