E981.18A39FB ELMOS Semiconductor, E981.18A39FB Datasheet - Page 47

• 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
5.12
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Fig. 25 shows the principle of of the LSD Ilim regulation loop.
Each Low side driver is provided with a passive gate pull down structure unit, disabled during activation,
and a gate to source clamping. The passive gate structure is a redundant (safety) feature of the LSD
control module.
Both is sketched in Fig. 26 and Fig. 27. The LSD locking is suspended only if the internal PORB reset
signal is at high level (see chapter 5.3). Additional either the TEST_LOW mode have to be selected by
an according SPI CMD or the UNLOCK and the ARM signals have to activated. In the first case the LSD
can be activated under Test Mode conditions, where all complement High side drivers are locked. In the
second case the Low side driver can be activated under normal, firing conditions by an according SPI
CMD.
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
TxL terminal is connected to LSD drain pin.
Provide LSD deployment current output (configurable in Normal Mode and Test Mode)
Internal polarization voltage and impedance for leakage detection
TxL over voltage detection with blank-out timer T
protection). The OV detection is active during LSD activation in normal mode and in test mode. In
test mode an over voltage event at TxL will switch off the driver immediately to minimize the applied
energy at the squib. In normal modes HCM and LCM the minimum switch on delay of the LSD has to
be bridged. The counter is triggered with an OV condition and is halted if OV condition disappears.
(→ pulsed shorts to V
the SPI output (see chapter 5.4.5). For a register reset a clear CMD must be set (see chapter 5.14).
TXL, Low Side Driver Outputs
BAT
). The OV event is latched and frozen in a register and can be read out at
Fig. 25 TXL (LSD) Ilim control block
Page 47 of 63
Data Sheet
OV_BLNK
and LSD switch off (short to battery
QM-No.: 25DS0072E.00
E981.18