4 Hardware
UM0178
18/37
4.7
Squib and deployment drivers
The on-chip deployment drivers are designed to deliver 1.2A (min.) at 6.9V VRES. Deployment
current is be 1.2A (min.) for 2ms (min.). The high side driver can survives deployment with
1.47A, 40V at VRES and SQL is shorted to ground for 2.5ms. Minimum load resistance is 1.7
Ohm. At the end of a deployment, a deploy success flag is asserted via SPI. Each VRES and
GND connection are used to accommodate 8 loops that can be deployed simultaneously.
Upon receiving a valid deployment condition, the respective SQH and SQL drivers are turned
on. SQH and SQL drivers are also turned on momentarily during a MOS diagnostic. Otherwise,
SQH and SQL are inactive under any normal, fault, or transient conditions. Upon a successful
deployment of the respective SQH and SQL drivers, a deploy command success flag is
asserted via SPI.
4.7.1 Features
●
8 deployment drivers sized to deliver 1.2A (min.) for 2ms (min.) and 1.75A (min.) for 1ms
(min.).
●
Independently controlled high-side and low-side MOS for diagnosis.
●
Analog output available for resistance.
●
Squib short to ground, short to battery and MOS diagnostic available on SPI register.
●
Capability to deploy the squib with 1.2A (min.) or 1.75A under 40V load-dump condition
and the low side MOS is shorted to ground.
●
Capability to deploy the squib with 1.2A (min.) at 6.9V V
RES
and 1.75A at 12V V
RES.
Figure 7.
Arming jumpers location
J21
J15
J20
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