SI82390AD-IS Datasheet, PDF (12/38 Pages) Silicon Laboratories – 4.0 A ISODrivers with 2.5 V VDDI and Safety Features

Si8239x Data Sheet
System Overview
Figure 2.17. Si82390/4/5/7 Device Behavior during Normal Operation and Shutdown
2.6.3 Control Inputs
VIA, VIB, and PWM inputs are high-true, TTL level-compatible logic inputs. A logic high signal on VIA or VIB causes the corresponding
output to go high. For PWM input versions (Si82394/8), VOA is high and VOB is low when the PWM input is high, and VOA is low and
VOB is high when the PWM input is low.
2.6.4 Enable Input
When brought low, the EN input unconditionally drives VOA and VOB low regardless of the states of VIA and VIB. Device operation
terminates within tSD after EN = VIL and resumes within tRESTART after EN = VIH. The EN input has no effect if VDDI is below its
UVLO level (i.e., VOA, VOB remain low). The EN pin should be connected to GNDI through a 100 kΩ pull-down resistor.
2.6.5 Delayed Startup Time
Product options Si82390/4/5/7 have a safe startup time (tSTARTUP_SAFE) of 1ms typical from input power valid to output showing
valid data. This feature allows users to proceed through a safe initialization sequence with a monotonic output behavior.
2.6.6 RDY Pin
This is a digital output pin available on all options except the Si82397. The RDY pin is “H” if all the UVLO circuits monitoring VDDI,
VDDA, and VDDB are above UVLO threshold. It indicates that device is ready for operation. An “L” status indicates that one of the
power supplies (VDDI, VDDA, or VDDB) is in an unpowered state.
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