E981.18A39FB ELMOS Semiconductor, E981.18A39FB Datasheet - Page 32

• Manufacturer Part Number: E981.18A39FB
• Description: Motor / Motion / Ignition Controllers & Drivers 8ch squib driver
• Manufacturer: ELMOS Semiconductor
• Type: Airbag Squib Driverr

Specifications of E981.18A39FB

• Rohs: yes
• Product: Electromechanical Drivers
• Operating Supply Voltage: 5 V
• Supply Current: 4.3 mA
• Operating Temperature: - 40 C to + 95 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-44
• Number Of Outputs: 8
• Power Dissipation: 3.2 W

8-Channel Airbag Squib Driver
PRELIMINARY INFORMATION - AUG 01, 2011
It's required to activate at first the LS-driver and to disable at first the HS-driver. Because the Firing
Time Limiter (FTL) will automatically switch off the HSD, it is not mandatory to sent the HSD switch off
command. For the LSD a switch off CMD is mandatory.
It's allowed to fire on any channel independently (activating or disabling the driver channels, while the
fire current is already flowing on other channels). The time t
to be at least > 200µs, to ensure a safe shut off of the HSD first. The time t
and TxUon) has to be ≥ 2µs. The delay t
greater than T
It is not recommended to activate or deactivate finally the drivers via the pins ARM or MRB, or by the
SPI-CMD's LOCK/UNLOCK or SPI_RESET, because here the internal slew rate control of the drivers is
not active. This can lead to high transients, when firing into inductive loads.
If the ARM-Pin is delayed after the TxU_ON CMD, there is no enlargement of the FTL duration. The
FTL-counter is only triggered by TxU_On CMD, not by the ARM low to high transition.
5.9
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The principle of the squib resistance diagnosis is shown in Fig. 18.
This document contains information on a pre-production product. ELMOS Semiconductor AG reserves the right to change specifications and information herein without notice.
ELMOS Semiconductor AG
External pin used for squib resistance reference measurement
internal reference current source I
multiplexor by according SPI CMD's. (see chapter 5.10)
I
Diagnosis loop closed by activated LSD in TEST_LOW Mode.
External squib difference voltage to be amplified by AMX amplifier and switched to AMX output Pin.
external RREF voltage to be amplified by AMX amplifier and switched to AMX output Pin.
Possibility to detect an open PGND connection caused by bond wire demolition or open pin.
REF40mA
Reference Resistance RREF & Squib resistance diagnosis
current source supplied by external U1-pin via 8V limiter V
off_del,NM
specified in 5.12.2, item 3.
REF_SQUIB
delay_lock
Page 32 of 63
can be switched to RREF or the TxU pins with S4
Data Sheet
between the TxLoff CMD and the LOCK CMD has to be
delay_dis
(time between TxUoff and TxLoff) has
8_IREF
delay_en
QM-No.: 25DS0072E.00
(time between TxLon
E981.18