E981.18A39FB ELMOS Semiconductor, E981.18A39FB Datasheet - Page 8

• 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
4.2
The following conditions apply unless otherwise stated. All potentials refer to GROUND (GND) unless
otherwise specified. Currents flowing into the circuit pins have positive values.
A dropping below this minimum recommended conditions during normal device operation can lead to
violations of all specified parameters, but the device will remain in a safe operating condition, which
means no maximum limits will be exceeded. Whereas a firing of the squib, while the maximum
recommended operation conditions are exceeded, can cause a permanently damage of the device.
1.) The maximum T
2.) For the calculation of U
•
•
•
•
•
It is obvious that this equation can not be fulfilled for all values of R
ensure a correctly firing of the squib for the minimum voltage at U
cover the full range of specification. This is illustrated in Figure 4 and 5 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
No.
chapter 5.11.2. This means it is not mandatory to send a switch off CMD for the HSD. This in in
opposite to the LSD, where a switch off CMD has to be sent.
The waiting time between two firing groups amounts 0µs.
sufficient firing current in application environment:
R
external line resistance of application in current path (U
R
R
So following expressions for U
U
U
SQUIB
ON_LSD_HCM /LCM,
ON_HSD_HCM/LCM
xfire_MIN_LCM
xfire_MIN_HCM
1 Supply voltage V5
2 Autarky voltage V
3 Squib supply voltage Ux in
4 Squib supply voltage Ux in
5
6 Ambient temperature
side drivers
diagnostic mode
LCM
Squib supply voltage Ux in
HCM
Recommended Operating Conditions
(including behavior over temperature)
≥ max{8V; (R
≥ max{12V; (R
Description
see chapter 5.11.1
see chapter 5.12.1
ON
time for the loop is limited by the firing time limiter values of the HSD, given in
A
for high
Xfire_MIN
Table 4: Recommended Operating Conditions
ON_HSD_LCM
ON_HSD_HCM
following parameters have to be taken into account to ensure a
xfire_MIN
V
4.5V<V
Diagnostic mode,
4.5V<V
Firing mode,no
restriction of
firing scenario,
4.5V<V
Firing mode,
no restriction of
firing scenario,
4.5V<V
+R
+R
are valid:
A
>(V
ON_LSD_LCM
Condition
ON_LSD_HCM
TxU
Page 8 of 63
5
5
5
5
Data Sheet
+8V),
<5.5V
<5.5V
<5.5V
<5.5V
+R
+R
SQUIB
SQUIB
V
V
V
V
V
2.)
+R
X
Symbol
+R
V5
VA
Ux_DIAG
ux_LCM
ux_HCM2
AMB
, TXL-TXU, GND) in following called R
parasitic
parasitic
1.) 2.)
1.)
X
, the squib resistance R
)
SQUIB
)
•
•
I
I
TXU
TXU
, U
Min
}
-40
4.5
}
12
12
8
8
X
and I
QM-No.: 25DS0072E.00
TXU
Typ
. For example to
Max
SQUIB
5.5
35
35
25
35
95
E981.18
must not
parasitic
Unit
o
V
V
V
V
V
C