900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






etcTI

TPIC71008-Q1 Datasheet Preview

TPIC71008-Q1 Datasheet

Eight-Channel Squib Drivers

No Preview Available !

TPIC71008-Q1
www.ti.com
Eight-Channel Squib Drivers
Check for Samples: TPIC71008-Q1
SLVSAX3 JUNE 2011
FEATURES
1
Eight-channel squib drivers for airbag
application
Loop diagnostics monitor and reporting
Two logic inputs providing independent safing
logic for enabling/disabling deployment
Eight independent thermally protected High
Side drivers that can source deployment or
diagnostic current level to each squib load
Eight independent avalanche voltage and
thermally protected Low Side drivers that can
sink deployment or diagnostic current level
from each squib load
Each output capable of 1.2A/1.75A firing
current for typical 2ms/0.5ms
SPI Slave Interface for serial bus
communication with parity check
Firing VZx voltage range 10V to 35V, transients
up to 40V
Programmable firing time up to 8.2 ms
Common Load current settings for all
deployment loops, using registers
Individual firing current timer limit set for each
deployment loop, using registers
Firing current timer to monitor firing current
over deployment time for each deployment
loop
Independent switch control for both high and
low side switches
Diagnostic mode for fault checking
Internal fault monitoring for safe operation
A multiplex-able output buffer for analog
voltage measurements
Use of external clamping devices on squib
pins is not required to protect the deployment
ASIC against substrate injection effects during
deployment due to dynamic shorts to ground
An external pin connection to the
microprocessor ADC supply for ratio-metric
squib resistance measurement.
40V pin capability on all pins (except GNDx,
AGND, DGND, VCC5, VDDIO, AMX_OUT)
Operating ambient temperature range: -40°C to
105°C
Thermally enhanced 48-pin TSSOP DCA
PowerPad package
APPLICATIONS
Squib Drivers for Airbag Application
Z6 1
ZM6 2
VZ0 3
Z0 4
ZM0 5
GND0 6
TEST1 7
VCC5 8
IWD 9
AMX_OUT 10
DGND1 11
AGND1 12
SQREF1 13
SQREF2 14
VADC 15
TEST2 16
VA2 17
TEST2 18
GND1 19
ZM1 20
Z1 21
VZ1 22
ZM4 23
Z4 24
GND0
Z6
DIAG
Z4
GND1
GND3
Z7
SPI/
Digital
BIAS
GND2
48 Z7
47 ZM7
46 VZ3
45 Z3
44 ZM3
43 GND3
42 DGND2
41 SOMI
40 SOMO
39 SCLK
38 CS_N
37 TZ
36 RESET_N
35 VDDIO
34 AGND
33 VA1
32 TEST4
31 NC
30 GND2
29 ZM2
28 Z2
27 VZ2
26 ZM5
25 Z5
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCT PREVIEW information concerns products in the
formative or design phase of development. Characteristic data and
other specifications are design goals. Texas Instruments reserves
the right to change or discontinue these products without notice.
Copyright © 2011, Texas Instruments Incorporated




etcTI

TPIC71008-Q1 Datasheet Preview

TPIC71008-Q1 Datasheet

Eight-Channel Squib Drivers

No Preview Available !

TPIC71008-Q1
SLVSAX3 JUNE 2011
www.ti.com
DESCRIPTION
The TPIC71008 is an eight channel squib driver for airbags deployment in automotive applications. Each channel
consists of a high side and low side switch with independent control logic for protection against inadvertent
deployment. Both the high and the low side switches have internal current limit and over-temperature protection.
The IC registers are used for eight channel configuration, control and status monitoring. To prevent inadvertent
deployment, the high and the low side switches are turned on only if the proper configuration sequence is used,
two independent arming/safing inputs are active and multiple inputs to the deploy controller logic are at the
correct level. The registers are programmed using a serial communications interface.
To prevent excessive power dissipation the maximum active ON time for each channel is limited by
programmable Firing Time Out Timer. In addition, a current limit register is used to program the maximum current
through the switches during a deployment. The current limitation on the low side switch is larger than the
corresponding current limitation on the high side switch. During deployment, the low side switch is fully enhanced
and operates with RDS_ON mode, while the high side switch is in current regulation mode.
IC diagnostic functions monitor deployment pin voltages to facilitate High Side switch test, Low Side switch test,
squib resistance measurements, squib leakage measurement to battery or ground or leakage between any squib
channels. The squib leakage measurement does not require the squib load to be present and covers both Zx and
ZMx pins. Diagnostic information is communicated through the AMX_OUT pin (for analog signals) and SPI
mapped status registers (for status signals latched in digital core).
The high-side and low-side squib drivers have a diagnostic level current limit and a deployment level current limit.
The default current limit for high-side and low-side squib drivers is the diagnostic level current limit. The high-side
switch deployment current limit for all high-side drivers can be set to either 1.2 A min or 1.75 A min (see Table 1)
through SPI mapped registers and device EEPROM settings (see Table 2). The low-side switch deployment
current limit is not programmable and is fixed to a level greater than the high-side driver current limit. The ON
time duration for each individual squib driver can be programmed through SPI mapped registers.
The deployment sequence requires a specific set of software commands combined with external hardware
arming/safing logic inputs (TZ=H, IWD=L) to provide deployment capability. The turn-on sequence of the
high-side and low-side drivers is software controlled via SPI commands. The turn-off procedure is automatically
controlled by the deployment ASIC for the high side drivers, while the low side drivers turn-off procedure can be
controlled by the deployment ASIC or by software via SPI commands. After the programmed ON time
deployment has been achieved, the high-side driver is deactivated first. It is followed by the low-side driver
deactivation after approximately 100usec (in case of hardware control turn-off sequence device configuration), or
after SPI command for low side driver turn-off has been received from an external microcontroller (in case of
software control turn-off sequence device configuration).
The RESET_N is an active low input reset signal. This input will be released high by the power supply unit and/or
the external microcontroller once the external voltage supplies are within the specified limits. The external
microcontroller is required to configure and control device through the serial communication interface. Reliable
software is critical for the system operation.
Table 1. Potential Deployment Settings for Typical Firing Current
FIRING
VOLTAGE
35 V
35 V
MAXIMUM AVERAGE FIRING
VOLTAGE BETWEEN VZx AND Zx
PINS TO ACHIEVE DEPLOYMENT
32.56 V
35.0 V
TYPICAL FIRING
CURRENT
1.2 A
1.75 A
DWELL (FIRING)
TIME
2 ms(1)
0.5 ms(1)
(1) For programming desired dwell (firing) time
Extended deployment duration activates the over-temperature protection circuit and terminates deployment. If
short-to-ground condition occurs during deployment, 35-V firing voltage is completely dropped across the
HS_FET, thereby thermal shut down protection kicks in to protect the device.
2
Submit Documentation Feedback
Product Folder Link(s): TPIC71008-Q1
Copyright © 2011, Texas Instruments Incorporated


Part Number TPIC71008-Q1
Description Eight-Channel Squib Drivers
Maker etcTI
PDF Download

TPIC71008-Q1 Datasheet PDF






Similar Datasheet

1 TPIC71008-Q1 Eight-Channel Squib Drivers
etcTI





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy