Data Sheet

Freescale Semiconductor
Technical Data
Document Number: MC33797
Rev 6.0, 2/2014
Four Channel Squib Driver IC
33797
The Four Channel Squib Driver IC is a complete squib diagnostic and
deployment interface for use in automotive air bag modules.
Extensive diagnostics and system control features are incorporated
to provide fail-safe operation. The device contains a serial peripheral
interface (SPI) compatible 8-bit interface to allow microprocessor
control.
The device has the capability to be used in a standard four channel
squib driver IC or in a cross-coupled state with the high and low side
squib drivers located on separate squib driver ICs. Both the high and
low side output drivers are protected against temporary shorts to
battery or ground. The current limit threshold is set by an external
resistor. This device is powered by SMARTMOS technology.
Features
• Four channel high side and low side 2.0 A FET switches
• Externally adjustable FET current limiting
• Adjustable current limit range: 0.8 to 2.0 A
• Individual channel current limit detection with timing duration
measurement, communicated via the SPI
• 8-Bit SPI for diagnostics and FET switch activation
• Diagnostics for high side safing sensor status
• Resistance and voltage diagnostics for squibs
• Squib driver IC capability to be used for cross-coupled driver firing
application (allows high and low side FET switches to be located
on separate squib driver ICs)
SQUIB DRIVER
EW SUFFIX (PB-FREE)
98ARH99137A
32-PIN SOICW
Applications
• Automotive air bag deployment
• Automatic seat belt retention
• Computer controlled model rocketry igniters
• Remote firing of pyrotechnic and firework displays
• Computer controlled firing of blasting caps for
mining and construction
• Military or police weapon systems
33797
VPWR
VIN
VBOS1
Typical
Air Bag
Power Supply
VFIRE_1
FIRING
CAP
VFIRE_1B
VFIRE_2A
Microprocessor
SENSE
VDIAG_2
VBOOST2
5.0 V
SQB_HI
VDIA_
FIRING
CAP
SQB_LO
VFIRE_RTN
VFIRE_2B
R_LIMIT_1
ENABLE
ENABLE
VDD
CS
CLK
MISO
MOSI
RST
FEN1
FEN_2
R_LIMIT_2
R_DIAG
GND
Figure 1. 33797 Simplified Application Diagram
© Freescale Semiconductor, Inc., 2006 - 2014. All rights reserved.
Squib
(1A, B 2A, 2B)
1
Orderable Parts
Table 1. Orderable Part Variations
Part Number
Temperature (TA)
Package
MC33797BPEW
-40 to 85 °C
32 SOICW
Notes
1. To order parts in Tape & Reel, add the R2 suffix to the part number.
33797
2
Analog Integrated Circuit Device Data
Freescale Semiconductor
INTERNAL BLOCK DIAGRAM
SQB_LO_2A
VFIRE_RTN
Driver Control
SQB_LO_2B
SENSE_2B
SQB_HI_2B
VFIRE_1B
VDD
VDIAG_1
CLK
MOSI
MISO
Driver Control
VFIRE_1A
SQB_HI_1A
SENSE_1A
SQB_LO_1A
VFIRE_RTN
SQB_LO_1B
Driver Control
SENSE_2A
Control and Diagnostic Multiplex
SQB_HI_2A
CS
FEN_2
FEN_1
Driver Control
VFIRE_2A
VDIAG_2
VFIRE_2B
INTERNAL BLOCK DIAGRAM
SENSE_1B
SQB_HI_1B
RST
R_LIMIT_1
R_DIAG
R_LIMIT_2
GND
Figure 2. 33797 Simplified Internal Block Diagram
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
3
PIN CONNECTIONS
PIN CONNECTIONS
SQB_LO_1A
SENSE_1A
MOSI
CLK
SQB_HI_1A
VFIRE_1A
VDIAG_1
GND
MISO
VDD
VFIRE_1B
SQB_HI_1B
FEN_1
R_LIMIT_1
SENSE_1B
SQB_LO_1B
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
SQB_LO_2A
SENSE_2A
CS
RST
SQB_HI_2A
VFIRE_2A
VDIAG_2
VFIRE_RTN
VFIRE_RTN
R_DIAG
VFIRE_2B
SQB_HI_2B
FEN_2
R_LIMIT_2
SENSE_2B
SQB_LO_2B
Figure 3. Pin Function Description
Table 2. Pin Function Description
Pin
Pin Name
Pin Function
Formal Name
Pin Description
1
SQB_LO_1A
Output
Squib Lo 1A
Drain of the low side switch that connects to the low pin of
Squib_1A
2
SENSE_1A
Input
Squib Sense 1A
Used during standard applications involving a four channel squib
driver IC or during cross-coupling applications involving two four
channel squib driver ICs (squib driver IC #1 and squib driver IC
#2).
3
MOSI
Input
Data Input 1
Serial data input for SPI interface.
4
CLK
Input
Serial Clock
Serial clock input for SPI interface.
5
SQB_HI_1A
Output
Squib Hi 1A
Drain of the high side switch that connects to the low pin of
Squib_1A
6
VFIRE_1A
Supply
Squib Firing Supply
1A
Firing supply pin for Squib_1A.
7
VDIAG_1
Input
Squib Diagnostic 1A
and 1A
Diagnostic pin for high side safing sensor for squibs 1A and 1B
and the VFIRE supply voltage.
8
GND
Ground
Device Ground
Device ground pin for internal logic and diagnostic circuitry.
9
MISO
Output
Data Output 0
Serial data output for SPI interface.
10
VDD
Input
Logic Power
Device power pin for internal logic and diagnostic circuitry.
11
VFIRE_1B
Supply
Squib Firing Supply
1B
Firing supply pin for Squib_1B.
12
SQB_HI_1B
Output
Squib Hi 1B
Drain of the high side switch that connects to the low pin of
Squib_1B
13
FEN_1
Input
FET Driver 1A and 1B Active high input signal to enable operation of the squib_1A and
Squib_1BFET drivers.
14
R_LIMIT_1
Output
Limit Resistor - 1A
and 1B
External resistor to ground is used to set current limit for
Squib_1A and squib_1B FET drivers.
15
SENSE_1B
Input
Squib Sense 1B
Used during standard applications involving a four channel squib
driver IC and during cross-coupling applications involving two
four channel squib driver ICs (squib driver IC #1 and squib driver
IC #2).
33797
4
Analog Integrated Circuit Device Data
Freescale Semiconductor
PIN CONNECTIONS
Table 2. Pin Function Description (continued)
Pin
Pin Name
Pin Function
Formal Name
Pin Description
16
SQB_LO_1B
Output
Squib Lo 1B
Drain of the low side switch that connects to the low pin of
Squib_1B
17
SQB_LO_2B
Output
Squib Lo 2B
Drain of the low side switch that connects to the low pin of
Squib_2B
18
SENSE_2B
Input
Squib Sense 2B
Used during standard applications involving a four channel squib
driver IC and during cross-coupling applications involving two
four channel squib driver ICs (squib driver IC #1 and squib driver
IC #2).
19
R_LIMIT_2
Output
Limit Resistor - 2A
and 2B
External resistor to ground is used to set current limit for
Squib_2A and squib_2B FET drivers.
20
FEN_2
Input
FET Driver 2A 
and 2B
Active high input signal to enable operation of the squib_2A and
Squib_2B FET drivers.
21
SQB_HI_2B
Output
Squib Hi 2B
Drain of the high side switch that connects to the low pin of
Squib_2B.
22
VFIRE_2B
Supply
Squib Firing Supply
2B
Firing supply pin for squib_2B.
23
R_DIAG
Input
Limit Resistor Diagnostic
External resistor to ground is used to set the diagnostic current
for squib resistance.
24
VFIRE_RTN
Ground
Squib Fire Power
Ground
Power Ground for squibs 1A, 1B, 2A, and 2B
25
VFIRE_RTN
Ground
Squib Fire Power
Ground
Power Ground for squibs 1A, 1B, 2A, and 2B
26
VDIAG_2
Supply
Squib Diagnostic 2A
and 2b
Diagnostic pin for high side safing sensor for squibs 2A and 2B
and the VFIRE supply voltage.
27
VFIRE_2A
Supply
Squib Firing Supply
2A
Firing supply pin for squib_ 2A
28
SQB_HI_2A
Output
Squib Hi 2A
Drain of the high side switch that connects to the low pin of
Squib_2A
29
RST
Input
Reset
Reset, Active Low
30
CS
Input
Chip Select
Chip Select for SPI interface, Active Low
31
SENSE_2A
Input
Squib Sense 2A
Used during standard applications involving a four channel squib
driver IC or during cross-coupling applications involving two four
channel squib driver ICs (squib driver IC #1 and squib driver IC
#2).
32
SQB_LO_2A
Output
Squib Lo 2A
Drain of the low side switch that connects to the low pin of
Squib_2A
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
5
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
Table 3. Maximum Ratings
All voltages are with respect to ground, unless otherwise noted. Exceeding these ratings may cause a malfunction or permanent
damage to the device.
Rating
Symbol
Value
Unit
VDD
7.0
V
INPUT ELECTRICAL RATINGS
Voltage on VDD
Voltage on Input pins CS, CLK, D1, D0, FEN_1, FEN_2, RESET,
R_DIAG, R_LIMIT_X
VI
V
-0.3 to VDD + 0.3
Voltage on Squib pins SQB_HI_XX, SQB_LO_XX, SENSE_XX
VVFIRE_XX
-0.3 to VVFIRE + 0.3
V
Voltage on pins VDIAG_X, VFIRE_XX
VDIAG_X
-0.3 to 35
V
(1)
ESD Voltage
Human Body Model
Machine Model
V
(1), (2)
Maximum VVFIRE with Pulsed Output
RSQUIB = 2.0 , tON = 0.8 ms, ISQUIB = 2.24 A
VESD1
±2000
VESD2
±200
VFPULSE
V
35
RSQUIB = 1.2 , tON = 0.8 ms, ISQUIB = 2.24 A
25
RSQUIB = 0.1 , tON = 0.60 ms, ISQUIB = 2.24 A
25
THERMAL RATINGS
Storage Temperature
Junction Temperature Ambient
Continuous (Prior to Squib Deployment)
t 5.0 ms (Post-squib Deployment)
TSTG
155
C
C
TA
85
TJCONT
TJDPYD
100
Peak Package Reflow Temperature During Reflow (3), (4)
TPPRT
Note 4
°C
Thermal Resistance (Junction-to-Ambient)
RJA
74
C/W
300
Notes
1
ESD1 testing is performed in accordance with the Human Body Model (CZAP = 100 pF, RZAP = 1500 ), ESD2 testing is performed in
accordance with the Machine Model (CZAP = 200 pF, RZAP = 0 ).
2
3
4
5.
With a nominal squib load, the FET squib driver will not enter thermal shutdown until the driver has been active for a minimum of 2.1 ms.
The individual squib driver thermal shutdown will not affect other squib driver firing “ON” times. With a shorted squib load, the FET squib
driver will not enter thermal shutdown until the driver has been active for a minimum of 2.1 ms. When the thermal shutdown limit is
exceeded, the FET driver will turn OFF and the thermal status bit will be set to 1. The FET squib driver can be activated through the
arm / fire command when the TEMPRENABLE (MIN) is reached (thermal shutdown status “0”). Nominal squib load is 2.15  ± 0.15 .
Shorted squib load is 0.1 
Three squib driver with RSQUIB = 0.1  conditions. Remaining squib driver conditions: RSQUIB = 1.2 , tON = 4.0 ms, ISQUIB = 2.0 A,
VVDIAG_X = VVFIRE_XX = 35 V.
Pin soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may
cause malfunction or permanent damage to the device.
Freescale’s Package Reflow capability meets Pb-free requirements for JEDEC standard J-STD-020C. For Peak Package Reflow
Temperature and Moisture Sensitivity Levels (MSL), Go to www.freescale.com, search by part number [e.g. remove prefixes/suffixes
and enter the core ID to view all orderable parts. (i.e. MC33xxxD enter 33xxx), and review parametrics.
33797
6
Analog Integrated Circuit Device Data
Freescale Semiconductor
ELECTRICAL CHARACTERISTICS
MAXIMUM RATINGS
Table 3. Maximum Ratings
All voltages are with respect to ground, unless otherwise noted. Exceeding these ratings may cause a malfunction or permanent
damage to the device.
Rating
OPERATING RATING
Symbol
Value
Unit
(6)
FET Driver Firing Current
RSQUIB = 2.0 , VSQUIBHI = 16 V, tON = 2.6 ms
RSQUIB = 1.2 , VSQUIBHI = 16 V, tON = 2.6 ms
RSQUIB = 0.1 , VSQUIBHI = 16 V, tON = 2.6 ms
ISQUIB
A
3.0
3.0
3.0
Notes
6
Operating ratings indicate conditions for which the device is intended to be functional. For guaranteed specifications and test conditions,
refer to the static and dynamic electrical characteristics tables on the following pages.
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
7
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 4. Static Electrical Characteristics
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 k ±1%, RR_DIAG = 10 k ±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
VDD
4.75
5.0
5.25
V
Leakage Current at Minimum High Side Driver Breakdown Voltage
IDHSD
–
39
100
µA
Leakage Current at Minimum Low Side Driver Breakdown Voltage
IDLSD
–
65
100
µA
INPUT VOLTAGE (VDD)
Input Voltage
FET DRIVERS
High Side Driver Current Limit Range Set via Rlimit Resistor with Low
Battery Condition
tON  4.0 ms, RR_LIMIT_X = 10 k, 5.0 V VVFIRE  7.0 V,
RSQUIB = 2.0 
High Side Driver Low Current Limit Range Set via Rlimit Resistor
tON  2.6 ms, RR_LIMIT_X = RL=4.32 k7.0 V  VVFIRE  35 V
IHS(LBAT)
IHS(NOM)
High Side Driver High Current Limit Range Set via Rlimit Resistor
tON  0.8 ms, RR_LIMIT_X = RL=45.3 k7.0 V  VVFIRE  35 V
IHS(HISET)
High Side Driver Current Limit Detect Threshold (7)
7.0 V  VVFIRE  35 V
Driver ON Resistance (per FET)
VVFIRE = 5.0 V, ILOAD = 0.5 A
VDD Operating Current
Standby (Diagnostics off, SPI “OFF”)
No Fire—Worst Case Diagnostics ($83/$2F Command Active)
Firing (with All FET Drivers “ON”)
VFIRE Quiescent Current
With Diagnostics Off
(8)
1.09
1.4
2.9
0.81
0.93
1.03
IHS(LOSET)
High Side Driver Nominal Current Limit Range Set via Rlimit Resistor
tON  2.6 ms, RR_LIMIT_X = RL=10 k7.0 V  VVFIRE  35 V
Low Side Drivers Current Limit
7.0 V  SQLO < 16 V
SQLO = 16 V
A
A
A
1.21
1.4
1.54
1.76
2.0
2.24
2.1
2.24
2.47
2.65
3.0
3.14
IHS x 0.85
–
IHS x 1.0
–
–
1.0
–
–
2.0
15
5.0
18.5
–
4.3
6.0
A
ILS
A
IMEAS
A

RDS(ON)
IDD
mA
IRRE
VDIAG Current During Squib Diagnostics
With Squib Resistance Diagnostics Active
IRRE
VFIRE Operating Current During Firing
Excluding Firing Current, IHS = 2.0 A
IRRE
VDIAG Operating Current During Firing
Per VDIAG pin, excluding Firing Current, IHS = 2.0 A
IRRE
µA
22
34
55
32
37
43
–
1.8
11
–
140
200
mA
mA
µA
Notes
7
Guaranteed by design
8
VFIRE quiescent current includes any leakage current through squib.
33797
8
Analog Integrated Circuit Device Data
Freescale Semiconductor
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 4. 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 k ±1%, RR_DIAG = 10 k ±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
VFIRE1A / VFIRE2A Current During High Side Safing Sensor Diagnostics
(Command $CO)
Per VFIREXA pin, with High Side Safing Sensor Diagnostic active
IRRE
VFIRE1B / VFIRE2B Current During High Side Safing Sensor Diagnostics
(Command $CO)
IRRE
Maximum Allowable External Capacitance to Ground
Per Squib pin SQB_LO and SQB_HI
(9)
Maximum Allowable External Resistance to Ground During Firing (9)
VFIRE_RTN pin to Ground
Individual FET Driver Thermal Shutdown (9), (10)
FET Driver Thermal Shutdown Re-enable Threshold After Drive Cool down
(9), (10)
Max
350
µA
22
32
55
0.3
2.0
3.8
mA
IQVFIRETOTAL
µA
90
135
180
–
–
0.12
–
–
0.15
160
–
190
90
–
110
CSMAX
µF

RSMAX
TSD
TREN
Unit
415
IRRE
Either VFIRE!B or VFIRE2B Diagnostic active
VFIRE Quiescent Current - Total
All VFIRE pins measured together, with Diagnostics Off
Typ
µA
260
Per VFIREXB pin, with High Side Safing Sensor Diagnostic active
VFIRE1B / VFIRE2B Current During VFIRE Diagnostics (Command $C5)
Min
C
C
FET DRIVERS HIGH AND LOW SIDE DRIVER TRANSISTOR STATUS /DIAGNOSTICS ($82, $83 COMMANDS)
Voltage Transistor Test Threshold for High Side Driver Transistor
VTRANTST1
High Side Driver Current Limit During High Side Driver Transistor
Diagnostics
15 V VVFIRE_XX 35 V
ITRANTST1
Voltage Transistor Test Threshold for Low Side Driver Transistor
VTRANTST2
Low Side Driver Current Limit During Low Side Driver Transistor
Diagnostics
15 V VVFIRE_XX 35 V
ITRANTST2
5.5
6.0
6.5
V
mA
2.0
10
50
1.0
1.4
2.0
V
mA
2.0
10
50
IFEN
-25
-40
-50
A
Logic Low Level
VFEN(LO)
0.0
2.5
0.35 x VDD
V
Fire Enable Pin Logic High Level
VFEN(HI)
0.65 x VDD
2.5
1.0 x VDD
V
FEN INPUT PIN (FEN_1 AND FEN_2)
Internal Current Pull-down
Notes
9
Guaranteed by design.
10
With a nominal squib load, the FET squib driver will not enter thermal shutdown until the driver has been active for a minimum of 2.1 ms.
The individual squib driver thermal shutdown will not affect other squib driver firing ON times. With a shorted squib load, the FET squib
driver will not enter thermal shutdown until the driver has been active for a minimum of 2.1 ms. When the thermal shutdown limit is
exceeded, the FET driver will turn OFF and the thermal status bit will be set to 1. The FET squib driver can be activated through the
arm / fire command when the TEMPRENABLE (MIN) is reached (thermal shutdown status “0”). Nominal squib load: 2.15  ± 0.15 .
Shorted squib load: 0.1 
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
9
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 4. 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 k ±1%, RR_DIAG = 10 k ±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
VDDRST
–
–
4.1
V
IRST
-6.0
-10
-15
A
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
RST INPUT PIN (ACTIVE LOW) (11)
System Reset Threshold
Internal Current Pull-down
SQUIB DIAGNOSTICS ($D0–$D3 COMMANDS) (12)
Diagnostic Current Through Squib (13)
IDIAG
30
34
40.5
mA
Resistance Threshold 1
(13)
RTH1
1.2
1.4
1.6

Resistance Threshold 2
(13)
RTH2
1.6
1.8
2.1

Resistance Threshold 3 (13)
RTH3
2.1
2.4
2.6

(13)
RTH4
2.6
2.9
3.2

Resistance Threshold 5 (13)
RTH5
3.3
3.7
4.4

(13)
RTH6
4.6
5.4
6.0

Resistance Threshold 7 (13)
RTH7
5.7
6.5
7.1

(13)
RTH8
6.7
7.8
8.5

Resistance Threshold 4
Resistance Threshold 6
Resistance Threshold 8
SQUIB SHORT-TO-BATTERY / GROUND DIAGNOSTICS AND SQUIB HARNESS SHORT-TO-BATTERY / GROUND DIAGNOSTICS WITH
AN OPEN SQUIB ($C1, $C3 COMMANDS)
Voltage Threshold for SQB_LO and SQB_HI Shorted to VPWR
7.0 V VVDIAG_X  35 V
VTHSB
Voltage Threshold for SQB_LO and SQB_HI Shorted to Ground
7.0 V VVDIAG_X  35 V
VTHSG
Current Sink Shorts Measurements I_SQB_LO_XX
1.0 V  SENSE_XX  16 V, Typical = 800 A
(14)
Current Source Shorts Measurements I_SQB_HI_XX (14)
1.0 V  SENSE_XX  16 V, 7.0 V  VVDIAG_X  35 V
Voltage Threshold for SQB_LO or SQB_HI Shorted to VPWR with an Open
Squib using $C3 Command
RSQUIB = Open
V
5.7
6.0
6.4
V
1.3
1.4
1.6
-500
-800
-900
1.7
3.5
3.7
A
ISINKSHRTS
ISOURSHRTS
mA
VTHSB_SO
V
5.75
–
6.79
Notes
11
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.
12
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 5, page 13.
RR_DIAG = 10 k ±1.0%
14
XX = 1A, 1B, 2A, or 2B.
33797
10
Analog Integrated Circuit Device Data
Freescale Semiconductor
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 4. 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 k ±1%, RR_DIAG = 10 k ±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
Voltage Threshold for SQB_LO or SQB_HI Shorted to Ground with an Open
Squib using $C3 Command
RSQUIB = Open
VTHSG_SO
1.3
1.8
2.0
V
DIAGNOSTICS FOR SQUIB CONTINUITY BETWEEN SENSE_XX AND SQB_LO_XX ($C2 COMMAND)
Current Threshold for SQUIB_LO_1A, 1B, 2A, and 2B Continuity Check for
Standard and Cross-coupled Conditions ($C2) SQUIB_LO_XXCONT (15)
7.0 V  VVDIAG_X  35 V
A
ITHSQB CON
150
–
350
1.0
1.4
2.0
DIAGNOSTICS FOR SQUIB SHORT BETWEEN FIRING LOOPS ($E0–$E3, $E8 COMMANDS)
Voltage Threshold for Standard Squib Connection
7.0 V  VVDIAG_X  35 V
VTHSQBNOM
Voltage Threshold for SQUIB_X Shorted to SQUIB_Y (1 or More Shorted
Conditions)
V
VTHSSQB
Short Between Squib Lines (Loops) (SQUIB_XX_SSQB_YY) (16)
V
1.0
1.4
2.0
VDIAG SUPPLY DIAGNOSTICS ($C0 COMMAND)
VDIAG Supply Voltage High Threshold
VDHI
15
17
19.0
V
VDIAG Supply Voltage Low Threshold
VDLO
5.7
6.5
7.2
V
VFIRE Supply Voltage High Threshold
VFDHI
15
17
19.0
V
VFIRE Supply Voltage Low Threshold
VFLO
5.7
6.5
7.2
V
VFIRE SUPPLY DIAGNOSTICS VFIRE_1B AND VFIRE_2B ($C5COMMAND)
VDIAG SUPPLY DIAGNOSTICS VDIAG_1 AND VDIAG_2 (ADDITIONAL VOLTAGE THRESHOLDS) ($C6 COMMAND)
VDIAG Supply Voltage Threshold 4
VVDIAG_X V4
29.8
32.8
38.5
V
VDIAG Supply Voltage Threshold 3
VVDIAG_X V3
25.5
27.7
30.5
V
VDIAG Supply Voltage Threshold 2
VVDIAG_X V2
20.5
22.6
26.5
V
VDIAG Supply Voltage Threshold 1
VVDIAG_X V1
16
18.4
21.0
V
R_RTN1 Short-to-Ground Threshold (Open Ground Connection)
RRTN1
0.15
–
0.6

R_RTN2 Short-to-Ground Threshold (Open Ground Connection)
RRTN2
0.15
–
0.6

4.1
5.1
6.1
VFIRE_RTN DIAGNOSTICS ($C9 COMMAND)
HIGH SIDE SAFING SENSOR DIAGNOSTICS ($C0 COMMAND)
R_HS Valid Resistor Range
15 V VVDIAG_X 35 V
RHS
R_HS Open Threshold
15 V VVDIAG_X 35 V
RHSO
k
k
6.1
7.2
9.0
Notes
15
XX = 1A, 1B, 2A, or 2B
16
XX and YY = 1A, 1B, 2A, or 2B
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
11
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 4. 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 k ±1%, RR_DIAG = 10 k ±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
R_HS Short Threshold
RHSS
2.8
–
4.1
k
VFIRE_XA & VFIRE_XB Current during High Side Safing Test at Open
Threshold
VFIRE_1A & VFIRE_1B or VFIRE_2A & VFIRE_2B
I1HSO
VFIRE_XA & VFIRE_XB Current during High Side Safing Test at Short
Threshold
VFIRE_1A & VFIRE_1B or VFIRE_2A & VFIRE_2B
I1HSS
A
270
360
410
A
287
385
439
HIGH SIDE SAFING SENSOR DIAGNOSTICS WITH 1 SAFING SENSOR IN FIRING PATH CONNECTED TO VFIRE_1A AND VFIRE_2A
PINS (GUARANTEED BY DESIGN) ($C0 COMMAND)
Total VFIRE_XX Current during High Side Safing Test at Open Threshold
VFIRE_1A, VFIRE_1B, VFIRE_2A & VFIRE_2B pins
I2HSO
Total VFIRE_XX Current during High Side Safing Test at Short Threshold
VFIRE_1A, VFIRE_1B, VFIRE_2A & VFIRE_2B pins
I2HSS
R_HS Valid Resistor Range
15 V VVDIAG_X 35 V
R2HS
R_HS Open Threshold
15 V VVDIAG_X 35 V
R2HSO
R_HS Short Threshold
15 V VVDIAG_X 35 V
R2HSS
A
574
705
848
605
748
892
A
k
2.10
–
2.93
2.93
3.35
4.43
1.14
1.61
2.10
RRL
4.32
–
45.3
k
R_LIMIT Open Threshold (“Out of Range Threshold”)
RRLO
60
76
105
k
R_LIMIT Short-to-Ground Threshold (“Out of Range Threshold”)
RRLS
2.82
3.5
4.31
k
Maximum External Capacitance to Ground
CRL
–
–
20
pF
RRD
8.0
–
13
k
R_DIAG Open Threshold (“Out of Range Threshold”)
RRDO
13
23
60
k
R_DIAG Short-to-Ground Threshold (“Out of Range Threshold”)
RRDS
3.0
5.4
8.0
k
Maximum External Capacitance to Ground
CRD
–
–
20
pF
k
k
R_LIMIT RESISTOR DIAGNOSTICS ($C8 COMMAND)
R_LIMIT Valid Resistor Range
R_DIAG RESISTOR DIAGNOSTICS ($C8 COMMAND)
(17)
R_DIAG Valid Resistor Range
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 5.
33797
12
Analog Integrated Circuit Device Data
Freescale Semiconductor
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 4. 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 k ±1%, RR_DIAG = 10 k ±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
0.0
–
0.2
0.7
–
1.0
Unit
SERIAL INTERFACE
Output Logic Low Level (D0)
ISINK = -800 µA
VOLOW
Output Logic High Level (D0)
ISOURCE = 800 µA
VOHIGH
Input Logic Threshold (D1, CS, CLK)
VLTHR
0.35
–
0.65
x VDD
D1 Pull-down Current
ID1
-6.0
-10
-15
µA
CLK Pull-down Current
ICLK
-6.0
-10
-15
µA
CS Pull-up Current
ICSBAR
10
20
30
µA
HI-Z Leakage (D0)
IHI-Z
–
–
±10
µA
x VDD
x VDD
Table 5. Resistance Range vs. R_DIAG
IDIAG
(NOM)
RTH1
Min / Max
RTH2
Min / Max
RTH3
Min / Max
RTH4
Min / Max
RTH5
Min / Max
RTH6
Min / Max
RTH7
Min / Max
RTH8
Min / Max
8.0 k
(-20%)
41
0.9 / 1.3
1.2 / 1.7
1.6 / 2.1
2.0 / 2.6
2.6 / 3.6
3.6 / 4.8
4.5 / 5.7
5.3 / 6.8
9.0 k
(-10%)
38
1.0 / 1.4
1.4 / 1.9
1.9 / 2.3
2.3 / 2.9
2.0 / 4.0
4.1 / 5.4
5.1 / 6.4
6.0 / 7.7
10.0 k
35
1.2 / 1.6
1.6 / 2.1
2.1 / 2.6
2.6 / 3.2
3.3 / 4.4
4.6 / 6.0
5.7 / 7.1
6.7 / 8.5
11.0 k
(+10%)
32
1.3 / 1.8
1.8 / 2.3
2.3 / 2.9
2.9 / 3.6
3.6 / 4.9
5.0 / 6.6
6.2 / 7.8
7.4 / 9.4
12.0 k
(+20%)
29
1.4 / 1.9
1.9 / 2.5
2.5 / 3.1
3.1 / 3.9
3.9 / 5.3
5.5 / 7.2
6.8 / 8.6
8.0 / 10.2
13.0 k
(+30%)
26
1.5 / 2.1
2.1 / 2.7
2.7 / 3.4
3.4 / 4.2
4.2 / 5.8
6.0 / 7.8
7.4 / 9.3
8.7 / 11.1
R_DIAG
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
13
ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Table 6. Dynamic Electrical Characteristics
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 k ±1%, RR_DIAG = 10 k ±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
tCYC
200
–
–
ns
73
–
–
73
–
–
–
–
20
–
–
20
–
–
20
–
–
20
73
–
–
73
–
–
30
–
–
30
–
–
SERIAL INTERFACE
CLK Cycle Time (1/FCLK) (18)
(18)
CLK High Time
VCLK > VDD x 70%
tHI
CLK Low Time (18)
VCLK < VDD x 20%
tLO
Clock Rise Time (18)
VCLK = 20% VDD to 70% VDD, CLOAD = 100 pF
tRISE
Clock Fall Time (18)
VCLK = 70% VDD to 20% VDD, CLOAD = 100 pF
tFALL
Data Out Rise Time (19)
VDO = 20% VDD to 70% VDD, CLOAD = 100 pF
tR
Data Out Fall Time (19)
VDO = 70% VDD to 20% VDD, CLOAD = 100 pF
tF
Chip Select Setup Time (19)
ns
ns
ns
ns
ns
tSU
D1 Valid Before CLK 
Data In Hold Time (19)
D1 Hold Time After CLK 
tH
Data Out Access Time (19)
tA
CSB  to D0 Valid
Data Out Disable Time
CSB  to D0 HI-Z
ns
tLAG
CLK  Before CSB 
Data In Setup Time (19)
ns
tLEAD
CSB  Before CLK 
Chip Select Hold Time (19)
ns
(19)
Data Out Valid Time (19)
CLK  to D0 Valid, CLOAD = 100 pF
(19)
Data Out Hold Time
D0 held After CLK 
Diagnostic Delay Time (Between Two Successive Commands)
ns
ns
ns
–
–
73
–
–
73
tDIS
ns
tV
ns
–
–
75
0.0
–
–
2.5
–
–
tHO
tDIAG
ns
s
Notes
18
Determined by Design
19
Guaranteed by Characterization
33797
14
Analog Integrated Circuit Device Data
Freescale Semiconductor
ELECTRICAL CHARACTERISTICS
DYNAMIC ELECTRICAL CHARACTERISTICS
Table 6. Dynamic 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 k ±1%, RR_DIAG = 10 k ±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
FET DRIVERS
Turn-On Delay Time
CS  to 80% IHS
tON
Turn-Off Delay Time
CS  to 20% IHS
tOFF
Diagnostic Timing / Resolution
tRESOLUTION
5.0 V  VVDIAG_X  35 V, IHS  IMEAS, 0 s tMEASURE_TIME  6.375 ms, 
CSQUIB_HI = 0.12 µF, CSQUIB_LO = 0.12 µF
µs
–
–
72
–
–
10
µs
µs
21.25
25
28.75
DIAGNOSTIC DELAY TIME
Squib Resistance Diagnostic Delay Time (20)
From CSB  Until Transistor Test Results Are Valid, CSQUIB_HI = 0.12 µF,
CSQUIB_LO = 0.12 µF
(20)
s
tDIAG1
–
Squib Open / Short Diagnostic Delay Time
From CSB  Until Squib Open / Short Diagnostic Results Are Valid, 
CSQUIB_HI = 0.12 µF, CSQUIB_LO = 0.12 µF
tDIAG2
VDIAG Supply Diagnostic Delay Time From CSB  until VDIAG Diagnostic
Results Are Valid (20)
tDIAG4
VFIRE Supply Diagnostic Delay Time (20)
15 V  VVDIAG_X  35 V, From CSB  Until High Side Safing Sensor
Diagnostic Results Are Valid, CVDIAG < 0.015 µF
tDIAG6
High Side Safing Sensor Diagnostic Delay Time (20)
15 V  VVDIAG_X  35 V, From CSB  Until High-Side Safing Sensor
Diagnostic Results Are Valid, CVDIAG < 0.015 µF
tDIAG7
–
–
3000
–
–
100
s
s
(20)
VFIRE_RTN Diagnostic Delay Time
From CSB  Until VFIRE_RTN Diagnostic Results Are Valid
(20)
–
500
s
–
FET Drivers High and Low Side Driver Transistor Diagnostic Delay Time
15 V  VVDIAG_X  35 V, From CSB  Until Transistor Test Results Are
Valid, CSQUIB_HI = 0.12 µF, CSQUIB_LO = 0.12 µF, CVDIAG < 0.015 µF
300
s
–
(20)
–
–
500
s
tDIAG9
–
–
1000
s
tDIAG10
Squib Continuity Diagnostic Delay Time
From CSB  Until VTHSQBCON Diagnostic Results Are Valid
tDIAG11
Squib Short Between Firing Loops Diagnostic Delay Time From CSB  Until
VTHSSQB Diagnostic Results Are Valid (20)
tDIAG12
–
–
300
–
–
3000
s
s
–
–
3000
12
14
16
FEN INPUT PIN
Minimum Pulse Width
FENFILTER
s
Notes
20
Guaranteed by Characterization
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
15
ELECTRICAL CHARACTERISTICS
TIMING DIAGRAMS
TIMING DIAGRAMS
Chip
Select
(/CS)
CS
80%
IHS
20%
tON
tOFF
Figure 4. Driver Timing Diagram
CS
CLK
MISO
MSB
6
5
4
3
2
1
LSB
MOSI
MSB
6
5
4
3
2
1
LSB
Figure 5. Freescale SPI
CS
CLK
MISO
MSB
6
5
4
3
2
1
LSB
MOSI
MSB
6
5
4
3
2
1
LSB
Figure 6. Alternative SCI Mode
33797
16
Analog Integrated Circuit Device Data
Freescale Semiconductor
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The Four Channel Squib Driver IC is a complete squib
diagnostic and deployment interface for use in automotive air
bag modules. Extensive diagnostics and system control
features are incorporated to provide fail-safe operation.
The device contains a serial peripheral interface (SPI)
compatible 8-bit interface for microprocessor control. This
interface allows the microprocessor to set up and read back
the results of all internal diagnostic functions. Squib
resistance level, along with possible shorts-to-battery or
ground, open ground connections, or shorts between squib
firing loops, are included in the diagnostic set. Additionally,
the squib supply voltage levels can be checked and the low
side fire return can be checked for an open condition (open
ground connection). The SPI interface, along with the
additional FEN pin, is used to arm and fire a selected squib.
The device has the capability to be used in a standard fourchannel squib driver IC or in a cross-coupled state with the
high and low side squib drivers located on separate squib
driver ICs.
Both the high side and low side output drivers are protected
against temporary shorts to battery or ground. The current
limit threshold is set by an external resistor.
FUNCTIONAL PIN DESCRIPTION
INTRODUCTION
DEVICE GROUND (GND)
In this section references are made to XX; e.g., in
SENSE_XX, SQB_LO_XX, and SQB_LO_XX_CONT. In
these and similar instances, XX denotes 1A, 1B, 2A, and 2B.
Device ground pin for internal logic and diagnostic circuitry.
SERIAL CLOCK (SCLK)
Serial clock input for SPI interface. Data on the D1 pin is
clocked into the device on the rising edge. Data is clocked out
of the device via the D0 pin on the falling edge. Default state
is low with no connection.
CHIP SELECT (CS)
Chip select for SPI interface. Active low. On rising edge, data
shifted into the shift register is internally latched. On falling
edge, diagnostic results are latched into shift register. Default
state is high with no connection.
MASTEROUT/SLAVE IN (MOSI)
Serial data input to 33797 SPI interface. Default state is low
with no connection.
MASTER IN/SLAVE OUT (MISO)
DEVICE POWER (VDD)
Device power pin for internal logic and diagnostic circuitry.
RESET (RST)
Reset Bar. Active low. With low input signal the internal
functions of the squib driver IC are disabled and all data in the
serial interface shift registers is cleared. Default state is low
with no connection.
LIMIT RESISTOR - DIAGNOSTIC (R_DIAG)
External resistor to ground is used to set the diagnostic
current for squib resistance.
LIMIT RESISTOR 1A AND 1B (R_LIMIT_1)
External resistor to ground is used to set current limit for
squibs 1A and 1B FET drivers.
LIMIT RESISTOR 2A AND 2B (R_LIMIT_2)
Serial data output from 33797 SPI interface.
External resistor to ground is used to set current limit for
squibs 2A and 2B FET drivers.
FET DRIVER 1A AND 1B (FEN_1)
SQUIB DIAGNOSTIC 1A AND 1B (VDIAG_1)
Active high input signal to enable operation of squibs 1A and
1B FET drivers. All diagnostic functions are available while
pin is low. Default state is low with no connection.
FET DRIVER 2A AND 2B (FEN_2)
Active high input signal to enable operation of squibs 2A and
2B FET drivers. All diagnostic functions are available while
pin is low. Default state is low with no connection.
Diagnostic pins for the high side safing sensors for squibs 1A
and 1B, as well as the VFIRE supply voltage.
SQUIB DIAGNOSTIC 2A AND 2B (VDIAG_2)
Diagnostic pins for the high side safing sensors for squibs 2A
and 2B, as well as the VFIRE supply voltage.
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
17
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
SQUIB SENSE XX (SENSE_XX)
The Sense pins are used exclusively for diagnostics related
to the squib, driver FETs, or harness. Commands using the
Sense pins include:
• C1, C2, C3, C9
• D<3:0>
• E<3:0>
• E9
• 82/1x
• 83/2x
Independent of the system configuration, normal or cross
coupled, the Sense pin, xx and SquibHi, xx of a single IC are
always connected to the same squib with the SquibHi pin
connected to the high pin of the squib and the Sense pin
connected to the low pin of the squib. A cross coupled
configuration is achieved by only cross coupling the squib low
pins. See Figure 7 and Figure 8.
STANDARD APPLICATIONS
In the standard mode, the $C2 (SQUIB_LO_XX_CONT)
command will be used to check continuity of the low side
driver from the SQB_LO_XX pin to the high side driver FET
(see Figure 6).
CROSS-COUPLED APPLICATIONS
Used during cross-coupling applications involving two four
channel squib driver ICs (squib driver IC #1 and squib driver
IC #2). SENSE_XX pins from squib driver IC #1 are
connected to their respective squib minus pins (Squib Low /
SQB_LO_XX) from squib driver IC #2 (Figure 8).
SENSE_XX pins are used to feed diagnostic signals back to
squib driver IC #1 for determining squib resistance, short-tobattery/ground, and squib loop-to-loop short conditions.
During a fire event, the fire current passes from squib driver
IC #1 high side driver though the squib to squib driver IC #2
low side driver (Figure 8). In the cross-coupled mode, the
squib driver IC #2 $C2 (SQUIB_LO_XX_CONT) command
will be used to check continuity of the low side driver from the
SQB_LO_XX pin to the low side driver FET.
DESIGN NOTES
configuration, most diagnostics are unaffected and are single
commands except for $C2 Low Side FET Continuity and
$E<3:0> Harness Shorts, and 83/2x Low Side FET test. This
command must be sent to each IC to be executed. For these
three diagnostics, two commands are required because the
forcing function and sensing function are on separate ICs.
Harness Shorts Diagnostics: Force using $E<3:0> on IC#1,
Sense $E8 on IC2
Low Side FET Continuity: Force using $C1 on IC#1, Sense
using $C2 on IC#2
Low Side FET Test: Force using $C1 on IC#1, Sense using
$C2 on IC#2
An active 600 A current sink is located in the SENSE_XX
pin. The sink current is used to pull the charge off of the
external EMC / filter caps after a diagnostic measurement has
been made.
SQUIB HI XX (SQB_HI_XX)
Squib high pins for squibs 1A, 1B, 2A, and 2B. These pins are
connected to the sources of the high side FET drivers, as well
as the diagnostic circuitry.
SQUIB LOW XX (SQB_LO_XX)
Squib low pins for squibs 1A, 1B, 2A, and 2B. These pins are
connected to the drains of the low side FET drivers, as well
as the diagnostic circuitry.
SQUIB FIRING SUPPLY XX (VFIRE_XX)
Firing supply pins for squibs 1A, 1B, 2A, and 2B. These pins
are connected to the drains of the high side FET drivers.
Feedback for high side safing for squibs 1A and 1B will be
referenced from VFIRE_1A and squibs 2A and 2B from
VFIRE_2A. For high side safing, VFIRE_1B should be
connected to VFIRE_1A pin and VFIRE_2B to VFIRE_2A
pin.
SQUIB FIRE POWER GROUND (VFIRE_RTN)
Return for squibs 1A, 1B, 2A AND 2B. The pins are tied to the
source pins of both low side FET drivers, as well as the
diagnostic circuitry. The RTN pins are tied internally.
Diagnostics always have the form of a forcing function and a
measurement or sense function. In a cross couple
33797
18
Analog Integrated Circuit Device Data
Freescale Semiconductor
FUNCTIONAL DESCRIPTION
FUNCTIONAL PIN DESCRIPTION
VBOOST
Dri ver Control 1A
VFIRE
CS1
SPI Interface
+
Squib 1
SENSE_1A
-
SQUIB IC #1
$C2 Command checks this
Figure 7. Standard Squib Firing
VBOOST
CS1
SPI Interface
CS2
Dri ver Control 1A
VFIRE
+
Squib 1
SENSE_1A
Squib 2
SQUIB ASIC #1
Dri ver Control
VFIRE
+
SENSE_1A
-
SQUIB ASIC #2
$C2 Command checks this
Figure 8. Cross-coupled Squib Firing
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
19
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
INTRODUCTION
In this section references are made to XX; e.g., in
SQB_HI_XX, SQB_LO_XX, and SENSE_XX pins.
SQB_HI_XX refers to SQB_HI_1A, SQB_HI_1B,
SQB_HI_2A or SQB_HI_2B, SQB_LO_1A, etc.
SERIAL INTERFACE
An 8-bit shift register is provided for communication through
the serial port to a microprocessor. The four wire SPI
interface is used to read from, and write to, the shift register.
Data written to the shift register will control the firing of the
FET switches or select a diagnostic mode. Data is
sequentially shifted into and out of the shift register, most
significant bit first.
Data read from the shift register will contain the results of the
diagnostic mode selected in the previous 8-bit write. If a NOP
command is written, all diagnostic modes are cleared and the
data in the shift registers will be read out. With any undefined
commands, all diagnostic modes are cleared and the data in
the shift registers will be read out. All functions are set when
CS goes high. All diagnostic commands are cleared on the
next valid SPI command.
SPI INTERFACE INTEGRITY CHECK
The $96 command with corresponding $69 return byte during
the next 8-bit write is used as an echo function to diagnose
the SPI integrity (refer to Table 9).
The Diagnostic Data Out bits not containing data are set to
zero.
Only 8-bit words will be accepted. Any words that are 7 bits
or 9 bits will be ignored or cleared.
The second byte for command programming will be treated
as a NOP if any FET is firing. The programming commands
must be sequential or they will be treated as a NOP.
The four channel squib driver IC is a slave peripheral device
designed to interface to a Freescale SPI or other serial
peripheral interface. Data is read on the rising edge of CLK,
and data is transferred out on the rising edge of CLK. On the
falling edge of CS, the IC configures itself for one of two SPI
modes. If CLK is low, the IC will configure itself to be in
Freescale SPI mode (see Figure 5). If CLK is high, the IC will
configure itself to be in an alternative SCI mode (see
Figure 5). In both cases, data is still read off the rising edge
and transferred off the falling edge of the CLK. When the IC
is deselected (CS goes high), then D0 is a high-impedance
output.
Response bit 7 of command $C8 (refer to Table 8, page 24)
is hard-wired to “1” or “0” to identify the squib IC as a four or
two channel squib driver IC. When a $C8 command is issued
for the four channel squib driver IC, the response bit 7 is set
to a “0”. When a $C8 command is issued for the two channel
squib driver IC, the response bit 7 is set to a “1”.
STANDARD SQUIB IC FUNCTION
The standard squib IC application utilizes the high and low
side squib drivers from the same squib driver ICs (see
Figure 6, Standard Squib Firing).
The SENSE_XX (1A, 1B, 2A, 2B) pin is connected to
SQB_LO_XX (1A, 1B, 2A, 2B). Squib diagnostics are
conducted using this pin. In the standard mode, the $C2
(SQUIB_LO_XX_CONT) command will be used to check
continuity of the low side driver from the SQB_LO_XX pin
(1A, 1B, 2A, 2B) to the low side driver FET (Figure 6).
The low side driver continuity is checked during the continuity
test. The driver continuity information will be cleared after the
information is transmitted on the next valid SPI command.
EXAMPLE—STANDARD SQUIB COMMAND SPI
SEQUENCE FROM MICROCONTROLLER
TX: Request squib short-to-battery / GND diagnostic measurement ($C1).
RX: Previous executed command information.
TX: Request squib 1A resistance measurement
($D0–$D3).
RX: Receive results from short-to-battery / GND diagnostics.
TX: Request squib 1B resistance measurement 
($D0–$D3).
RX: Receive measured squib 1A resistance information.
TX: Request squib 2A resistance measurement 
($D0–$D3).
RX: Receive measured squib 1B resistance information.
TX: Request squib 2B resistance measurement 
($D0–$D3).
RX: Receive measured squib 2A resistance information
TX: Request continuity command ($C2).
RX: Receive measured squib 2B resistance information
TX: Request another command sequence.
RX: Receive low side driver 1A, 1B, 2A, and 2B continuity
information. Latches will be cleared after data transferred from the squib IC (clear on rising edge of chip
select).
TX: Request loop-to-loop short command ($E0–$E3)
RX: Previous executed command information.
33797
20
Analog Integrated Circuit Device Data
Freescale Semiconductor
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
TX: Request another command sequence.
RX: Receive loop-to-loop results from test.
TX: Run another command on the same squib IC #1.
RX: Receive measured squib 1A resistance information.
CROSS-COUPLED SQUIB IC FUNCTION
TX: Squib IC #1 request continuity command ($C2).
RX: Previous executed command information.
The cross-coupled application utilizes the high and low side
squib drivers from two different squib driver ICs (see
Figure 8, Cross-Coupled Squib Firing, page 19.) Through the
SPI interface, the squib IC will maintain the capability to
conduct standard diagnostics (short-to-battery, short-toground, short between squibs, and squib diagnostics)
between two different squib ICs. The squib IC must maintain
the capability to fire the squib drivers with the ARM and FIRE
command in either cross-coupled or single IC applications.
When the firing squib driver IC is used in cross-coupled
applications, the low side squib driver must be activated prior
to activating the high side squib driver.
Cross-coupling the high and low side squib driver from two
different squib driver ICs must be done without interfering
with standard squib operations when the squib IC is used in
an application where the high and low side squib drivers are
located on the same IC.
All remaining diagnostic functions will operate standard in
either a cross-coupled or single IC applications. These
functions include RR_DIAG, RR_LIMIT_X, high side, VVFIRE_XX,
VVFIRE_RTN, VTRANSTX, squib current timing measurement,
and FEN_1 and FEN_2 diagnostics.
The SENSE_1A (1B, 2A, or 2B) pin squib IC #1 is connected
to SQB_LO_1A (1B, 2A, or 2B) pin squib driver IC #2 and is
used to feed the diagnostic signal for determining squib
resistance and short-to-battery / ground conditions (see
Figure 8, page 19). During a fire event, the fire current
passes from squib driver IC #1 high side driver though the
squib to squib driver IC #2 low side driver. In the crosscoupled mode, the squib driver IC #2 $C2
(SQUIB_LO_1A_CONT, [1B, 2A, or 2B]) command will be
used to check continuity of the low side driver from the
SQB_LO_1A (1B, 2A, or 2B) pin to the low side driver FET.
The low side driver continuity is checked during the continuity
test. The driver continuity information will be cleared after the
information is transmitted on the next valid SPI command.
EXAMPLE—CROSS-COUPLED SQUIB COMMAND
SPI SEQUENCE FROM MICROCONTROLLER
TX: Squib IC #2 request continuity command ($C2).
RX: Previous executed command information.
TX: Squib IC #2 request continuity command ($C2).
RX: Receive low side driver continuity information for low
side drivers which reside on IC #2.
TX: Squib IC #1 request another command sequence.
RX: Receive low side driver continuity information for low
side drivers that reside on IC #1.
TX: Squib IC #1 request loop-to-loop short command 
($E0–$E3)
RX: Previous executed command information.
TX: Squib IC #2 request loop to loop short command for
other ICs ($E8).
RX: Previous executed command information.
TX: Squib IC #2 request loop-to-loop short command for
other ICs ($E8).
RX: Receive loop-to-loop results from test run on IC #1.
TX: Squib IC #1 request another command sequence.
RX: Receive loop-to-loop results from test run on IC #1.
FIRING A SQUIB
The firing of a squib driver requires the FEN_1 and FEN_2
pins to be high and two separate 8-bit writes be made to the
shift register. With FEN_1 pin high, squibs 1A and 1B can be
armed and fired. With FEN_2 pin high, squibs 2A and 2B can
be armed and fired. The first write is to ARM squib drivers in
preparation of receiving the fire command. Squib 1A and
squib 1B can be armed separately from squib 2A and
squib 2B (refer to Table 7) or all squibs can be fired at once
(refer to Table 8). All ARM and 5X (Fire) commands will be
echoed back on the SPI Data output.
TX: Squib IC #1 request squib 1A resistance measurement
($D0).
RX: Previous executed command information.
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
21
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Table 7. Squib Firing Commands
Hex Code
Command Description
A0 ARM Squib Drivers 1A and 1B
A1 ARM Squib Drivers 2A and 2B
Byte #1
Byte #2
Squib B
High Side
Squib B
Low Side
Squib A
High Side
A0
ARM Squib Drivers 1A and 1B
A1
ARM Squib Drivers 2A and 2B
Squib A
Low Side
Squib 2B
A2
Squib 2A
Squib 1B
Squib A1
ARM Squib Drivers 1A, 1B, 2A, 2B
50
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
51
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
52
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
53
OFF
OFF
ON
ON
OFF
OFF
ON
ON
54
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
55
OFF
ON
OFF
ON
OFF
ON
OFF
ON
56
OFF
ON
ON
OFF
OFF
ON
ON
OFF
57
OFF
ON
ON
ON
OFF
ON
ON
ON
58
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
59
ON
OFF
OFF
ON
ON
OFF
OFF
ON
5A
ON
OFF
ON
OFF
ON
OFF
ON
OFF
5B
ON
OFF
ON
ON
ON
OFF
ON
ON
5C
ON
ON
OFF
OFF
ON
ON
OFF
OFF
5D
ON
ON
OFF
ON
ON
ON
OFF
ON
5E
ON
ON
ON
OFF
ON
ON
ON
OFF
5F
ON
ON
ON
ON
ON
ON
ON
ON
The second write is to actually fire the desired driver. The four
most significant bits of the second write are used to establish
a parity with the four most significant bits of the first write. The
four least significant bits are the data bits, and each bit
represents a squib driver or squib driver pair. If there is a
parity mismatch of the four most significant bits, the data bits
will be ignored and the squib drivers will not have their status
changed. The 2-byte write sequence must then be started
again. During the first write, when the drivers are armed, all
diagnostic functions are cleared.
Once fired, a driver can only be turned off by one of the
following:
• Sending a valid 2-byte write sequence through the shift
register.
• Having the reset pin pulled low.
• Having the thermal shutdown limit exceeded (once
minimum firing duration requirement has been met;
refer to Note (4) in Maximum Ratings).
• Having the FEN pin pulled low. Note that the code
sequences allow any combination of drivers to be
turned on or off.
Once fired, the current limit measurement register
increments when the squib current is measured and is above
the IMEAS threshold during the timer activation.
The FEN_1 or FEN_2 pin must be high to enable firing of the
drivers. If fire command is active and the FEN (1 or 2) pin is
pulled low, the FET drivers will turn off (assuming the latch
and hold function is not in effect; refer to paragraph entitled
FEN_1 and FEN_2, FEN_1 and FEN_2 (FEN) ($C8
Command)). If fire command is active and the FEN (1 or 2)
pin is pulled high, the FET driver will turn on.
During the firing of a squib, significant I•R losses may occur,
which could cause a voltage shift across a circuit board trace.
It is recommended that current paths for discharging the firing
supply storage capacitors through the squib be kept as short
as possible and isolated from logic and diagnostic grounds.
33797
22
Analog Integrated Circuit Device Data
Freescale Semiconductor
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Table 8. Diagnostic Bit Definitions
Hex
Code
Command
Description
Diagnostic Data Out (Available on Next Command)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
0
0
0
0
0
SQB_1A
BIT 6
SQB_1A
BIT 5
SQB_1A
BIT 4
SQB_1A
BIT 3
SQB_1A
BIT 2
SQB_1A
BIT 1
SQB_1A
BIT 0
LS
SQB_1B
BIT 4
SQB_1B
BIT 3
SQB_1B
BIT 2
SQB_1B
BIT 1
SQB_1B
BIT 0
LS
00
NOP
70
Squib 1A Current
Measurement
Time
SQB_1A
BIT 7
MS
71
Squib 1B Current
Measurement
Time
SQB_1B
BIT 7
MS
72
Squib 2A Current
Measurement
Time
SQB_2A
BIT 7
MS
SQB_2A
BIT 6
SQB_2A
BIT 5
SQB_2A
BIT 4
SQB_2A
BIT 3
SQB_2A
BIT 2
SQB_2A
BIT 1
SQB_2A
BIT 0
LS
73
Squib 2B Current
Measurement
Time
SQB_2B
BIT 7
MS
SQB_2B
BIT 6
SQB_2B
BIT 5
SQB_2B
BIT 4
SQB_2B
BIT 3
SQB_2B
BIT 2
SQB_2B
BIT 1
SQB_2B
BIT 0
LS
79
Squib X Current
Status
0
0
0
0
7F
Thermal
Shutdown Status
ThermalSD
Thermal
LSDSTAT
_2B
Thermal
HSDSTAT
_2B
Thermal
LSDSTAT
_2A
Thermal
HSDSTAT
_2A
Thermal
LSDSTAT
_1B
Thermal
HSDSTAT
_1B
Thermal
LSDSTAT
_1A
Thermal
HSDSTAT
_1A
C0
VDIAG and High
Side Safing
Sensor
Diagnostics
RSSLO
RSSHI
VDIAG _2
VDIAG _2
RSSLO
RSSHI
VDIAG _1
VDIAG _1
VDHI
VDLO
VDHI
VDLO
C1
Squib Short-toGround / Short-toBattery
Diagnostics
SQB_2B
NO_SH_
GND
SQB_2B
NO_SH_
BATT
SQB_2A
NO_SH_
GND
SQB_2A
NO_SH_
BATT
SQB_1A
NO_SH_
GND
SQB_1A
NO_SH_
BATT
C2
Low Side Driver
Continuity Status
0
0
0
0
C3
Harness Short-toGround / Short-toBattery with
Squib Open (No
Squib Present)
SQB_2B
OPEN
NO_SH_
GND
SQB_2B
OPEN
NO_SH_
BATT
SQB_2A
OPEN
NO_SH_
GND
SQB_2A
OPEN
NO_SH_
BATT
Hex
Code
Command
Description
C5
C6
SQB_1B BIT SQB_1B BIT
6
5
SQB_2B
SQB_2A
SQB_1B
SQB_1A
Current Limit Current Limit Current Limit Current Limit
Status
Status
Status
Status
SQB_1B
NO_SH_
GND
SQB_1B
NO_SH_
BATT
SQB_LO_2B_ SQB_LO_2A SQB_LO_1B SQB_LO_1A
CONT
CONT
CONT
CONT
SQB_1B
OPEN
NO_SH_
GND
SQB_1B
OPEN
NO_SH_
BATT
SQB_1A
OPEN
NO_SH_
GND
SQB_1A
OPEN
NO_SH_
BATT
Diagnostic Data Out (Available on Next Command)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
VFIRE_1B and
VFIRE_2B
Voltage
0
0
0
VFIRE _B
X
X
VHI
VLO
VDIAG_1 and
VDIAG_2
Diagnostics
VDIAG_2
V4
VDIAG_1
V4
VDIAG_1
V3
VDIAG_1
V2
VDIAG_1
V1
Tested
VDIAG_2
V3
VDIAG_2
V2
VDIAG_2
V1
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
23
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Table 8. Diagnostic Bit Definitions (continued)
C8
FEN Status,
R_LIMIT_X,
R_DIAG Status, 
IC Type
1
C9
VFIRE_RTN
Status
(Open Ground)
0
0
0
D0
Squib 1A
Resistance
SQB_1A
RC8
SQB_1A
RC7
SQB_1A
RC6
D1
Squib 1B
Resistance
SQB_1B
RC8
SQB_1B
RC7
D2
Squib 2A
Resistance
SQB_2A
RC8
D3
Squib 2B
Resistance
E0
R_LIMIT_2 R_LIMIT_1
R_DIAG
NO_FAULT NO_FAULT NO_ FAULT
FEN 2
Latch
Status
FEN 1 Latch
Status
FEN 2
Status
FEN 1
Status
0
0
VFIRE_
RTN_2
VF2LOW
VFIRE_
RTN_1
VF1LOW
SQB_1A RC5 SQB_1A RC4
SQB_1A
RC3
SQB_1A
RC2
SQB_1A
RC1
SQB_1B
RC6
SQB_1B RC5 SQB_1B RC4
SQB_1B
RC3
SQB_1B
RC2
SQB_1B
RC1
SQB_2A
RC7
SQB_2A
RC6
SQB_2A RC5 SQB_2A RC4
SQB_2A
RC3
SQB_2A
RC2
SQB_2A
RC1
SQB_2B
RC8
SQB_2B
RC7
SQB_2B
RC6
SQB_2B RC5 SQB_2B RC4
SQB_2B
RC3
SQB_2B
RC2
SQB_2B
RC1
Shorts Between
Squib Loops,
Squib 1A
0
0
0
0
SQB_2B
SQB_1A
SQB_2A
SQB_1A
SQB_1B
SQB_1A
SQB_1A
E1
Shorts Between
Squib Loops,
SQUIB 1B
0
0
0
0
SQB_2B
SQB_1B
SQB_2A
SQB_1B
SQB_1B
SQB_1A
SQB_1B
E2
Shorts Between
Squib Loops,
Squib 2A
0
0
0
0
SQB_2B
SQB_2A
SQB_2A
SQB_1B
SQB_2A
SQB_1A
SQB_2A
E3
Shorts Between
Squib Loops,
Squib 2B
0
0
0
0
SQB_2B
SQB_2A
SQB_2B
SQB_1B
SQB_2B
SQB_1A
SQB_2B
E8
Shorts Between
Squib Loops, for
Additional ICs
0
0
0
0
SQB_2B
SHORT
SQB_2A
SHORT
SQB_1B
SHORT
SQB_1A
SHORT
0
33797
24
Analog Integrated Circuit Device Data
Freescale Semiconductor
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Table 9. Command Programming and Diagnostic Bit Definitions
Hex
Code
3X
80
XX
81
Command
Description
Command Programming Input and Diagnostic Data Out (Available on Next Command) (21)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Current
Measurement
Register Reset
Command for
Squib X
Current 1 = ON
0
0
1
1
SQB_2B
Data / Timer
Reset
SQB_2A
SQB_1B
SQB_1A
Data / Timer Data / Timer Data / Timer
Reset
Reset
Reset
DATA OUT
Squib X Current
Register Reset
Status
0
0
1
1
SQB_2B
Data / Timer
Reset
SQB_2A
SQB_1B
SQB_1A
Data / Timer Data / Timer Data / Timer
Reset
Reset
Reset
Unlock for FEN 1
Counter Registers
Programming.
1
0
0
0
0
0
0
0
Response DATA
Output: Command
Echoed
1
0
0
0
0
0
0
0
Programming
Command for
FEN 1 Counter
1 = ON
FEN1 CNT
BIT 7
MSB
FEN1 CNT
BIT 6
FEN1 CNT
BIT 5
FEN1 CNT
BIT 4
FEN1 CNT
BIT 3
FEN1 CNT
BIT 2
FEN1 CNT
BIT 1
FEN1 CNT
BIT 0
LSB
Response DATA
OUT
FEN 1 Counter
Programming
Status
FEN1 CNT
BIT 7
MSB
FEN1 CNT
BIT 6
FEN1 CNT
BIT 5
FEN1 CNT
BIT 4
FEN1 CNT
BIT 3
FEN1 CNT
BIT 2
FEN1 CNT
BIT 1
FEN1 CNT
BIT 0
LSB
Unlock for FEN 2
Counter Registers
Programming
1
0
0
0
0
0
0
1
Response DATA
Output: Command
Echoed
1
0
0
0
0
0
0
1
Notes
21
The second byte for command programming will be treated as a NOP if any FET is firing. The programming commands have to be
sequential or they will be treated as a NOP.
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
25
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Table 9. Command Programming and Diagnostic Bit Definitions (continued)
Hex
Code
XX
Command
Description
Command Programming Input and Diagnostic Data Out (Available on Next Command) (22)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
FEN2 CNT
BIT 7
MS
FEN2 CNT
BIT 6
FEN2 CNT
BIT 5
FEN2 CNT
BIT 4
FEN2 CNT
BIT 3
FEN2 CNT
BIT 2
FEN2 CNT
BIT 1
FEN2 CNT
BIT 0
LS
FEN2 CNT
BIT 7
MS
FEN2 CNT
BIT 6
FEN2 CNT
BIT 5
FEN2 CNT
BIT 4
FEN2 CNT
BIT 3
FEN2 CNT
BIT 2
FEN2 CNT
BIT 1
FEN2 CNT
BIT 0
LS
Unlock to Test High
Squib Drivers 1A,
1B, 2A, 2B
1
0
0
0
0
0
1
0
Response DATA
Output: Command
Echoed
1
0
0
0
0
0
1
0
High Side Driver
Transistor Test
Command
0
0
0
1
SQB_ 2B
High Side
Driver “ON”
Response DATA
OUT
High Side Driver
Transistor Status
VTRANTST1
0
0
0
0
Unlock to Test Low
Squib Drivers 1A,
1B, 2A, and 2B
1
0
0
0
0
0
1
1
Response Data
Output: Command
Echoed
1
0
0
0
0
0
1
1
Low Side Driver
Transistor Test
Command
0
0
1
0
Response DATA
OUT Low Side
Driver Transistor
Status VTRANTST2
0
0
0
0
Programming
Command for
FEN 2 Counter
1 = ON
Response DATA
OUT
FEN 2 Counter
Programming
Status
82
1X
83
2X
SQB_2B
SQB_ 2A
SQB_1B
SQB_1A
High Side
High Side
High Side
Driver “ON” Driver “ON” Driver “ON”
SQB_2A
SQB_1B
SQB_1A
HSDSTAT_2B HSDSTAT_2A HSDSTAT_1B HSDSTAT_1A
SQB_ 2B Low SQB_2A
SQB_1B
SQB_1A
Side Driver
Low Side
Low Side
Low Side
“ON”
Driver “ON” Driver “ON” Driver “ON”
SQB_2B
SQB_2A
SQB_1B
SQB_1A
LSDSTAT_ 2B LSDSTAT_ 2A LSDSTAT_1B LSDSTAT_1A
Notes
22
The second byte for command programming will be treated as a NOP if any FET is firing. The programming commands have to be
sequential or they will be treated as a NOP.
33797
26
Analog Integrated Circuit Device Data
Freescale Semiconductor
FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSIS FEATURES
Table 9. Command Programming and Diagnostic Bit Definitions (continued)
Hex
Code
Command
Description
Command Programming Input and Diagnostic Data Out (Available on Next Command) (23)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
90
Reserved for
Freescale Read
NVM Low
X
X
X
X
X
X
X
X
91
Reserved for
Freescale Read
NVM High
X
X
X
X
X
X
X
X
92
Reserved for
Freescale NVM
Enable
X
X
X
X
X
X
X
X
93
Reserved for
Freescale Test
Mode Enable
X
X
X
X
X
X
X
X
96
SPI Integrity Check
1
0
0
1
0
1
1
0
Response DATA
OUT: $69 Echo to
Diagnose the SPI
Integrity
0
1
1
0
1
0
0
1
Notes
23
The second byte for command programming will be treated as a NOP if any FET is firing. The programming commands have to be
sequential or they will be treated as a NOP.
PROTECTION AND DIAGNOSIS FEATURES
The diagnostic circuit’s internal references are provided by a
bandgap voltage reference, and by scaled currents
determined by the resistor value of R_DIAG and the value of
the bandgap voltage. Refer to Table 8, and Table 9, as
necessary throughout this section.
R_DIAG and R_LIMIT_X RESISTOR DIAGNOSTICS
($C8 COMMAND)
This function monitors reference currents derived by the
R_LIMIT_1, R_LIMIT_2, and R_DIAG resistors. An open pin
or short to ground will cause the comparator to give an “out
of range resistor value” indication. A short to VDD will have
the same effect as an open pin and will cause an “out of range
resistor value” indication.
R_LIMIT_X and R_DIAG DATA RESULTS
If R_LIMIT_X is open, shorted to ground, or shorted to VDD,
the bit R_LIMIT_NO_FAULT will be set to “0”. Standard
operation will have this bit set to “1”.
If R_DIAG is open, shorted to ground, or shorted to VDD, the
bit R_DIAG_NO_FAULT will be set to “0”. Standard operation
will have this bit set to “1”.
The FEN 1 and FEN 2 status bits are a reflection of the
FEN_1 and FEN_2 pins.
HIGH SIDE SAFING SENSOR DIAGNOSTICS
($C0 COMMAND)
This function monitors the VFIRE_XX pin connection to the
VDIAG_X pin. The high side safing function is attached to the
VFIRE _1A and VFIRE_2A pins. The high side safing
function is not available on the VFIRE _1B and VFIRE_2B
pins.
When enabled, this diagnostic circuit will typically draw less
than 500 µA from the VFIRE supply voltage source.
Internal window comparators will monitor the voltage
difference between the VDIAG_X pin and the VFIRE_XX pin,
and will provide two bits of data to indicate if the pin voltage
is either above (open) or below (shorted) the threshold levels.
When using a high side safing sensor, typical 5.1 k
reference resistor must be placed across the sensor to
provide a current path for the diagnostic circuit. As long as
there is a current path and the safing sensor switch is open,
the resulting differential voltage will fall between the
comparator thresholds so neither an open fault nor a shorted
fault condition will be indicated. A closed safing sensor will be
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
27
FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSIS FEATURES
indicated as a short, and a loss of the connection between the
VDIAG_X pin and the VFIRE_XX pin will be indicated as an
open. Any external capacitance on the VFIRE_XX pin will
affect the time needed to settle to an accurate value.
compared to four thresholds and will provide four bits of data
to indicate if the pin voltage is above, below, or between the
predetermined threshold levels. There is one diagnostic
circuit for each VDIAG_X pin.
HIGH SIDE SAFING SENSOR DIAGNOSTIC DATA
RESULTS
VDIAG_X VOLTAGE DIAGNOSTIC DATA RESULTS
If the VDIAG_X voltage is above the threshold limit, the
If the VFIRE_XX pin is shorted to the VDIAG_X pin, the
RSSLO bit will be set to “0” and the RSSHI bit will be set to
“0”. If the VFIRE_XX pin has no connection to the VDIAG_X
pin, the RSSLO bit will be set to “1” and the RSSHI bit will be
set to “1”. Standard operation with a safing sensor resistor will
have the RSSHI bit set to “0” and the RSSLO bit set to “1”.
VDIAG_X VX bit will be set to “1”. If the VDIAG_X voltage is
below the threshold limit, the VDIAG_X VX bit will be set to
“0”.
FIRING SUPPLY VOLTAGE (VDIAG_X)
DIAGNOSTICS ($C0 COMMAND)
This function monitors the voltage on the VDIAG_X pin. The
supply voltage is compared to two thresholds (nominal and
minimum) and will provide two bits of data to indicate if the pin
voltage is above, below, or in between the predetermined
threshold levels. There is one diagnostic circuit for each
VDIAG_X pin.
VDIAG_X SUPPLY VOLTAGE DIAGNOSTIC DATA
RESULTS
If the VDIAG_X voltage is above the high limit, bits VDHI and
VDLO will both be set to “1”. If the VDIAG_X voltage is
between the high limit and the low limit, bit VDHI will be set to
“0” and VDLO will be set to “1”. If the VDIAG_X voltage is
below the low limit, bits VDHI and VDLO will both be set to
“0”.
FIRING SUPPLY VOLTAGE (VFIRE_XX)
DIAGNOSTICS ($C5 COMMAND)
This function monitors the voltage on the VFIRE_XX pin. The
supply voltage is compared to two thresholds (nominal and
minimum) and will provide two bits of data to indicate if the pin
voltage is above, below, or in between the predetermined
threshold levels. There is one diagnostic circuit for each
VFIRE_XX pin.
VFIRE_XX SUPPLY VOLTAGE DIAGNOSTIC DATA
RESULTS
If the VFIRE_XX voltage is above the high limit, bits VFHI and
VFLO will both be set to “1”. If the VFIRE_XX voltage is
between the high limit and the low limit, bit VFHI will be set to
“0” and VFLO will be set to “1”. If the VFIRE_XX voltage is
below the low limit, bits VFHI and VFLO will both be set to “0”.
FIRING SUPPLY VOLTAGE DIAGNOSTICS,
VDIAG_X V1, V2, V3, V4 ($C6 COMMAND)
The VDIAG_X V1, V2, V3, V4 function monitors voltage on
the VDIAG pins. The voltage being measured is then
VFIRE_RTN DIAGNOSTICS ($C9 COMMAND)
This function monitors the resistance on the VFIRE_RTN pin
for open pin connections. The VFIRE_RTN voltage is
compared to a threshold to determine if the VFIRE_RTN pin
connection between the pin and the printed circuit board is
shorted or open.
VFIRE_RTN DIAGNOSTIC DATA RESULTS
If the VFIRE_RTN pin is above the threshold limit (open), the
VFIRE_RTN X VFXLOW will be set to “1”. If the VFIRE_RTN
pin is below the threshold limit (shorted), the VFIRE_RTN X
VFXLOW will be set to “0”.
VFIRE return tests are disabled during firing.
DESIGN NOTES
For all standard or cross-coupled squib IC configurations, the
SQB_LO_XX pin must be tied to a SENSE_XX pin for either
squib IC #1 or squib IC #2 (see Figure 6 and Figure 8).
An active 600 A current sink is located in the SENSE_XX
pin. The sink current is used to pull the charge off the external
EMC / filter caps after a diagnostic measurement has been
made.
SQUIB SHORT-TO-BATTERY / GROUND
DIAGNOSTICS ($C1 COMMAND)
This function monitors the voltage on the SENSE_XX pins.
The voltage is compared to two thresholds (minimum and
maximum) and will provide two bits of data to indicate if the
pin voltage is above, below, or in between the predetermined
threshold levels.
When enabled, a 2.7 mA current source located in the
SQB_HI_XX pin is activated, sourcing current from the
SQB_HI_XX to the SENSE_XX pin. When resistive
measurement legs to comparators located in the SENSE_XX
pin are activated, a fault on either side of the squib can be
easily detected. An external current path that causes the
SQB_LO_XX, SQB_HI_XX, or SENSE_XX pin to be pulled
below the minimum threshold, will be indicated as a “Short to
Ground”.
If the SQB_LO_XX, SQB_HI_XX, or SENSE_XX pin has an
external current path that causes the pin to be pulled above
the maximum threshold, a “Short to Battery” will be indicated.
33797
28
Analog Integrated Circuit Device Data
Freescale Semiconductor
FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSIS FEATURES
SQUIB SHORT-TO-BATTERY/GROUND
DIAGNOSTIC DATA RESULTS
If SQB_LO_XX, SQB_HI_XX, or SENSE_XX pin is shorted to
battery, the bit NO_SH_BATT will be set to “0”. If a
SQB_LO_XX, SQB_HI_XX, or SENSE_XX pin is shorted to
ground, the bit NO_SH_GND will be set to “0”. During
standard operation, both NO_SH_BATT and NO_SH_GND
will be set to “1”.
Note This diagnostic circuit uses an internal 2.7 mA current
source connected to the SQB_HI_XX pin as a bias. If the
SQB_LO_XX and SQB_HI_XX pins have any capacitance
(due to discrete capacitors or parasitic loading), the
diagnostic condition will require a settling time based on the
RC time constant.
SQUIB HARNESS SHORT-TO-BATTERY / GROUND
DIAGNOSTICS WITH AN OPEN SQUIB ($C3
COMMAND)
This diagnostic function is to be used with no squib present
(open squib condition) in the wiring harness. For an open
squib condition, the function must monitor the voltage on the
SQB_HI_XX and SQB_LO_XX pins for “Short to Ground”
and “Short to Battery” conditions.
This function monitors the voltage on the SENSE_XX pins.
The voltage is compared to two thresholds (minimum and
maximum) and will provide two bits of data to indicate if the
pin voltage is above, below, or in between the predetermined
threshold levels.
When enabled, a pair of opposing N-channel CMOS
transistors are activated, creating roughly a 500 resistance
between the SQB_HI_XX and SQB_LO_XX pins together.
A 2.7 mA current source located in the SQB_HI_XX pin is
activated, sourcing current from the SQB_HI_XX to the
SQB_LO_XX pin to the SENSE_XX pin. When resistive
measurement legs to comparators located in the SENSE_XX
pin are activated, a short to BAT / GND fault can easily be
detected. An external current path that causes the
SQB_LO_XX, SQB_HI_XX, or SENSE_XX pin to be pulled
below the minimum threshold, will be indicated as a “Shortto-Ground”.
If the SQB_LO_XX, SQB_HI_XX, or SENSE_XX pin has an
external current path that causes the pin to be pulled above
the maximum threshold, a “Short-to-Battery” will be indicated.
SQUIB SHORT-TO-BATTERY/GROUND
DIAGNOSTIC DATA RESULTS
If SQB_LO_XX, SQB_HI_XX, or SENSE_XX pin is shorted to
battery, the bit OPEN NO_SH_BATT will be set to “0”. If a
SQB_LO_XX, SQB_HI_XX, or SENSE_XX pin is shorted to
Ground, the bit OPEN NO_SH_GND will be set to “0”. During
standard operation, both OPEN NO_SH_BATT and OPEN
NO_SH_GND will be set to “1”.
Notes
1. This diagnostic circuit uses an internal 2.7 mA current
source connected to the SQB_HI_XX pin as a bias. If
the SQB_LO_XX and SQB_HI_XX pins have any
capacitance (due to discrete capacitors or parasitic
loading) the diagnostic condition will require a settling
time based on the RC time constant.
2. With an OPEN NO_SH_GND or OPEN_NO_SH_BATT
indicated, the SQB_HI_XX or SQB_LO_XX line
contains the fault condition. The standard squib shortto-battery / ground diagnostics ($C1) can be executed
to determine if the fault condition is on the SQB_HI_XX
pin or the SQB_LO_XX pin.
CONTINUITY TEST for the LOW SIDE DRIVER
SQB_LO_XX CONNECTION ($C2 COMMAND)
(LOW SIDE DRIVER CONTINUITY STATUS)
Low side driver continuity is checked during the continuity
test diagnostics. This function is used to check continuity at
the SQB_LO_XX pin connection. When enabled, a 2.0 mA
current source located in the SQB_HI_XX pin is activated
sourcing current from the SQB_HI_XX to the SQB_LO_XX
pin.
For a standard connection, the SQUIB_LO_XX_CON bit will
be set to “1”. With an open circuit connection, the
SQUIB_LO_XX bit will be set to “0”. The driver continuity
information will be cleared after the information is transmitted
on the next valid SPI command.
SQUIB RESISTANCE DIAGNOSTICS ($D0–$D3
COMMAND)
This function monitors squib resistance. When enabled, a
diagnostic current derived from R_DIAG is passed through
the selected squib. The resulting voltage across the squib is
amplified and passed to an 8-bit voltage level detector. The
eight bits of data will indicate if the selected squib has a
resistance value above or below predetermined thresholds.
The value of R_DIAG can be varied to allow the detection
range to be altered. Increasing the value of R_DIAG will
reduce the diagnostic current; thus, a higher squib resistance
will be needed to reach the same RTH points. In the case that
R_DIAG is a short-to-ground, the diagnostic current through
the squib resistance will typically be less than 50 mA.
SQUIB RESISTANCE DIAGNOSTIC DATA
RESULTS
A comparator result bit set to “1” indicates that the input
voltage is above the threshold resistance for that bit. Thus an
open squib would cause all bits to be set to “1”; likewise, a
shorted squib will cause all bits to be set to “0”.
Squib resistance tests are disabled during firing.
SQUIB DIAGNOSTICS SHORTS BETWEEN SQUIB
LINES (FIRING LOOPS) ($EX COMMAND)
This function monitors conditions that have shorts between
squib lines (firing loops). When enabled, a 2.7 mA current
source located in the SQB_HI_XX pin is activated sourcing
current from the selected SQB_HI_XX to the SENSE_XX pin.
The resulting voltage is checked on all other squib lines to
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
29
FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSIS FEATURES
determine if the squib lines are shorted. In applications using
more than one squib driver IC, a separate command can also
be issued to check all squibs for shorted squib lines.
SQUIB DIAGNOSTICS SHORTS BETWEEN SQUIB
LINES DIAGNOSTIC DATA RESULTS (SHORTS
BETWEEN FIRING LOOPS)
A comparator result bit set to “1” for SQUIB_XX indicates
standard test current detected in squib line under test.
A comparator result bit set to “0” for SQUIB_XX indicates
faulty diagnostic current detected in squib line under test.
A comparator result bit set to “1” for SQUIB_XX_SSQB_ YY
indicates that the squib line is shorted to the squib under test.
A comparator result bit set to “0” for SQUIB_XX_SSQB_YY
indicates no shorted squib line detected (standard
conditions). If more than two squibs are shorted together, the
response will consist of all “0”s.
RESET (RST)
The RESET pin has an internal current pull-down of typically
40 A. While this pin is low, the internal functions of the squib
driver IC are disabled and all data in the serial interface shift
registers is cleared. This includes all FEN 1 and 2 counter
programming, squib driver activation, and squib driver FET
tests. With a minimum system VDD  4.1 V, the system reset
bar threshold will be set to “0”.
FEN_1 and FEN_2 (FEN) ($C8 COMMAND)
FEN_1 and FEN_2 have an internal current pull-down of
typically 40 A. While the FEN pin is low, firing of the FET
drivers is disabled. All internal diagnostic functions and
results will be available through the serial interface. The FEN
pin must be pulled high to enable firing of the FET drivers.
Also, the pin state can be used to turn the FET driver “ON”
and “OFF” after the arm and fire command has been issued.
(That is, once the FET drivers are turned on, pulling FEN_1
or FEN_2 low can turn the drivers off if the latch and hold
function is not active, and pulling FEN_1 or FEN_2 high will
activate the drivers if the fire command is still active). Status
of FEN 1 and FEN 2 is contained in the C8 diagnostic byte,
as shown in Table 8).
The FEN_1 and FEN_2 function should be capable of
latching and holding the enable function for electronic safing
function input. This function is required for dual-stage air bag
applications. FEN_1 or FEN_2 will be considered active
when either pin is active (“1”) for more than 12 ms. Tolerance
range for the filter to be used will be 12 to 16 s.
When FEN_1 or FEN_2 input is active high, the FEN_1 or
FEN_2 function will be active high. When the FEN_1 or
FEN_2 input state transitions from high to low, a
programmable latching function will hold the FEN function
active until the timeout of the FEN timer. The programmable
latch and hold function will be capable of delays from 1.0 ms
to 255 ms, in 1.0 ms increments. The timer is reset to
programmed time when FEN_1 or FEN_2 pin transitions from
“0” to “1”. The programmable counter delay will be set
through an SPI command during module power-up / proveout. The default for the counter will be 0 ms.
The bits FEN 1 and FEN 2 STATUS are a reflection of their
respective pins.
The counter will be reset to 0-Sec time during a reset
condition.
Notes
1. Status information will be required to read counterprogrammed value.
2. Precautions need to be taken in the design to prevent
the latching function from becoming a glitch catching
function.
FEN 1 and FEN 2 COUNTER PROGRAMMING ($80
and $81 COMMAND)
The FEN 1 and FEN 2 counters require two separate 8-bit
writes be made to the shift register. The first write is to unlock
($80 or $81) and reset the FEN counter registers in
preparation of receiving a command. The second byte
contains the programming information to set the required
counter delay time (0 ms to 255 ms with 1.0 ms interval).
Squib IC Power-Up default and $80 or $81 followed by $00
command will set the counter to 0 ms timer delay (refer to
Table 9, page 25.)
The FEN 1 and FEN 2 Counter programming status bits are
a reflection of the counters programming. The programming
status information can be compared to the data sent to
ensure the squib driver was programmed properly. Counter
programming status will be shifted from the shift register
during the next read / write operation (Table 9). All unlock
commands will be echoed back on the SPI Data output.
FET DRIVER CURRENT LIMIT
A single resistor is used to set the current limit protection of
the high side drivers of both squib channels. The low side
current limit is never less than the high side current limit.
Table 10. RR_LIMIT_X Current Limit
RR_LIMIT_X
VVFIRE = 7.0 V
VVFIRE = 35 V
4.32 k
0.92 A
0.92 A
10 k
1.37 A
1.37 A
45.3 k
2.0 A
2.0 A
Example of current limit conditions:
RR_LIMIT_X = 10 k, IHS = A ± A
The high side driver controls the current through the squib.
The current limit for the low side driver is only to protect the
low side driver stage from excessive current in the event of a
short to battery.
With RR_LIMIT_X conditions < 4.32 k or shorted to ground,
the current limit will default to the RR_LIMIT_X = 10 k current
limit, not to exceed. With RR_LIMIT_X resistance value > 60 k
33797
30
Analog Integrated Circuit Device Data
Freescale Semiconductor
FUNCTIONAL DEVICE OPERATION
PROTECTION AND DIAGNOSIS FEATURES
or open, the current limit will default to the
RR_LIMIT_X = 10 k maximum current limit.
FET DRIVER CURRENT LIMIT MEASUREMENT
($7X COMMAND)
This function measures the firing current in each squib line
and records the “ON” time in which the IMEAS is above the
threshold for each squib. (Refer to Dynamic Electrical
Characteristics table, Dynamic Electrical Characteristics.)
The timing registers can be reset via SPI command so
additional current measurements can be made.
An 8-bit message will be used to determine 255 time steps.
The driver current limit measurement is activated when each
individual high side driver is activated. Each time the squib
current is measured above the IMEAS threshold during the
timer activation, a status bit will be set to “1”. If the current
measured is not above the IMEAS threshold during the timer
activation, the timing data log bit will not increment. Each
squib timing register can be reset via SPI command so
additional current measurements can be made. Initial squib
IC power-up will reset the timing registers (i.e., “Power-ON
Reset”). When reset, the current limit measurement register
byte will be set to $00.
Command $79 will indicate the status of the current limit
measurement comparator. The current limit measurement
from the test is captured and loaded into the register on the
next valid SPI command. When the firing current is above
IMEAS, the current limit is activated and the status bit will be
set to “1”. If the firing current is below IMEAS, the current limit
status bit will be set to “0”.
FET DRIVER CURRENT LIMIT MEASUREMENT
RESET COMMAND ($3X COMMAND)
The current limit status registers can be individually reset with
the command set found in Table 9. When the register bit is
set to “1” for squib X, the current measurement register will
be reset to $00.
SQUIB DRIVER THERMAL SHUTDOWN
($7F COMMAND)
With a nominal squib load, the FET squib driver will not enter
thermal shutdown until the driver has been active for a
minimum of 2.09 ms. The individual squib driver thermal
shutdown will not affect other squib drivers firing “ON” times.
With a shorted squib load, the FET squib driver will not enter
thermal shutdown until the driver has been active for a
minimum of 2.090 ms. For the shorted squib load, the
associated FET squib driver may enter thermal shutdown
with an “ON” time of 2.09 ms  tON  2.82 ms.
When the thermal shutdown limit is exceeded, the thermal
status will be set to “1”. The thermal shutdown status ($7F)
diagnostics latch the thermal bit status when executed. The
Squib Driver Thermal shutdown status latch will be cleared
after the information is transmitted on the next valid SPI
command (i.e., TX: NOP or next $7F, latch cleared on rising
edge of chip select).
The FET squib driver can be activated through the arm / fire
command when the TEMPRENABLE (MIN) is reached (thermal
shutdown status “0”).
VTRANTSTX, HIGH AND LOW SIDE SQUIB DRIVER
FET TEST and STATUS ($82 TO $83 COMMAND)
This function checks the squib driver FET transistor status.
The high and low side squib driver FET test requires FEN_1
and FEN_2 pins to be low and two separate 8-bit write
commands to be made to the shift register. With the FEN_1
and FEN_2 pins status LOW, the first write is to unlock in
preparation of receiving the diagnostic command for testing
the high and low side squib drivers. The unlock command
($82 and $83) is an “AND” function with the FEN_1 and
FEN_2 BAR. All transistor test unlock commands ($82 and
$83) will be echoed back on the SPI Data output.
The high or low side squib driver FET test will be aborted if
firing from any FET is enabled.
During the first write (unlock command), all diagnostic
functions are cleared. After the second write is completed, all
other diagnostic functions are made available again.
Squib 1A, squib 1B, squib 2A, and squib 2B high side squib
drivers will be activated and diagnosed by the $82 followed
by $1X diagnostic command (refer to Table 9). A load from
the SQB_HI_XX pin to the SENSE_XX pin is required for the
high side squib driver to be tested.
Squib 1A, squib 1B, squib 2A, and squib 2B low side squib
drivers will be activated and diagnosed by the $83 followed
by $2X diagnostic command (Table 9).
When enabled the high or low side FET driver will be enabled
and current limited to a nominal current limit of 10 mA. The
high and low side driver test time is not automated and is
controlled through SPI.
When either a $82 or a $83 command is issued, the previous
transistor test will stop to prevent coinciding high and low side
FET drive transistors from turning “ON”. This prevents high
and low side drivers from being activated simultaneously.
Note The high or low side squib driver test is capable of
checking a code sequence, allowing any combination of high
or low side drivers to be tested.
The diagnostic squib driver bit (HSDSTAT_X or
LSDSTAT_X) will be set to “1” if the squib driver did not
activate (turn “ON”) during the diagnostic test. The diagnostic
squib driver bit (HSDSTAT_X or LSDSTAT_X) will be set to
“0” if the squib driver did activate (turn “ON”) during the
diagnostic test. Diagnostic data will be shifted from the shift
register during the next read/write operation.
The diagnostic squib driver register will be set / cleared to “0”
when the unlock command is loaded ($82 or $83 loaded with
rising edge of CS). A diagnostic bit set to “0” indicates
standard squib driver transistor operation.
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
31
PACKAGING
PACKAGE DIMENSIONS
PACKAGING
PACKAGE DIMENSIONS
Important For the most current revision of the package, visit www.freescale.com and do a keyword search on the 98A drawing
number below.
EW SUFFIX (PB-FREE)
32-PIN
98ARH99137A
REVISION B
33797
32
Analog Integrated Circuit Device Data
Freescale Semiconductor
PACKAGING
PACKAGE DIMENSIONS
.
EW SUFFIX (PB-FREE)
32-PIN
98ARH99137A
REVISION B
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
33
PACKAGING
PACKAGE DIMENSIONS
EW SUFFIX (PB-FREE)
32-PIN
98ARH99137A
REVISION B
33797
34
Analog Integrated Circuit Device Data
Freescale Semiconductor
REVISION HISTORY
REVISION HISTORY
Revision
3.0
4.0
Date
11/2006
Description of Changes
•
•
•
•
Updated to the current Freescale format and style
Implemented Revision History page
Added MCZ33797EK/R2
Removed Peak Package Reflow Temperature During Reflow (solder reflow) parameter from
Maximum Ratings on page 6. Added note with instructions from www.freescale.com.
•
In Static Electrical Table changed Input Voltage minimum from 4.57 to 4.75 on page 7, for symbol
ITHSQB CON, corrected Unit of Measurement from mA to , and for VDIAG Supply Diagnostics,
changed Command from $C5 to $C6 onpage 10
Changed High Side Safing Sensor Diagnostic Data Results on page 28.
Updated Outline Drawing to Revision B.
6/2007
•
•
5.0
11/2011
6.0
2/2014
•
•
Removed MCZ33797EK/R2 from the ordering information and added MC33797BPEW/R2
Updated the Static and Dynamic Electrical Characteristics Table (min and max ratings) for
MC33797BPEW.
•
No technical changes. Revised back page. Updated document properties. Added SMARTMOS
sentence to last paragraph.
33797
Analog Integrated Circuit Device Data
Freescale Semiconductor
35
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© 2014 Freescale Semiconductor, Inc.
Document Number: MC33797
Rev 6.0
2/2014
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