E981.18A39FB ELMOS Semiconductor, E981.18A39FB Datasheet - Page 28

• 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
To activate the HSD in deployment mode, following signals have to be set:
•
•
•
The driver will be switched off automatically by FTL or can be switched off externally by µP with the
according TxU_OFF CMD by SPI. A short circuit event at the TxU during switch on phase, will not
disable the HSD, but reduce the current limitation value. After the SC disappears again, the current
limitation value is regulated to the nominal, intended value again (for more details see chapter 5.11).
The short circuit event is visible at the MISO output frame in this case.
To activate the HSD in TEST_UP-Mode following signals have to be set:
•
•
The driver will be switched off automatically by FTL or can be switched off externally by µP with the
according TxU_OFF CMD by SPI in TEST_UP mode, too. To limit the energy applied to the Squib
during transient short circuit to GND, the HSD will be switched off immediately, if the TxU drops below
the threshold SC
circuit to GND, the driver will be activated again until the FTL timer or a SPI Driver off CMD deactivates
the HSD. The short circuit event is visible at the MISO output frame in this case, too.
5.7.2
The LSD control can be separated into two different modes:
•
•
The principle of the HSD control module is shown in pictures Fig. 15 below.
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
CODELOCK to be opened by SPI CMD (0x71)
ARM pin to be set to logical high level
Finally switching on the driver by the according SPI CMD (TxU_ON)
TEST_UP to be set by SPI CMD (0xE3)
Finally switching on the driver by the according SPI CMD
Deployment Modes (NM)
Switch Test Mode with reduced current level (TEST_LOW Mode)
LSD Control Module
TxU_REF
(see chapter 5.11.1). If the SC event disappears again, as during pulsed short
Fig. 14 FTL test
Page 28 of 63
Data Sheet
QM-No.: 25DS0072E.00
E981.18