Table 2.3. Si82397 Dual Drivers with No UVLO Status

VIA

VIB

EN1

VDDI

VDDA

VDDB

VOA

VOB

Notes

H

L

H

P

P

P

H

L

L

H

H

P

P

P

L

H

H

H

H

P

P

P

H

H

L

L

H

P

P

P

L

L

X

X

L/NC

P

P

P

L

L

Device disabled

X

X

X

UP2

P

P

L

L

Fail-safe output when

VDDI is unpowered

H

X

H

P

P

UP

H

UD3

VOA depends on VDDA

state

L

X

H

P

P

UP

L

UD

X

H

H

P

UP

P

UD

H

VOB depends on VDDB

state

X

L

H

P

UP

P

UD

L

Note:

1. The EN pin needs to be pulled down with a 100 kΩ resistor externally to GND.

2. The chip can be powered through the VIA,VIB input ESD diodes even if VDDI is unpowered. It is recommended that inputs be left

unpowered when VDDI is unpowered. The EN pin has a special ESD circuit that prevents the IC from powering up through the

EN pin.

3. UD = undetermined if same side power is UP.

Table 2.4. Si82394/8 PWM Input HS/LS Drivers with UVLO Status

PWM

EN1

VDDI

VDDA

VDDB

VOA

VOB

RDY

Notes

H

H

P

P

P

H

L

H

See Dead-time note and

Figure 2.18 Dead Time

Waveforms for High-

Side/Low-Side Drivers on

page 13 for timing

L

H

P

P

P

L

H

H

X

L/NC

P

P

P

L

L

H

Device disabled

X

X

UP2

P

P

L

L

UD3

Fail-safe output when

VDDI unpowered

H

H

P

P

UP

H

UD

L

VOA depends on VDDA

state

L

H

P

P

UP

L

UD

L

H

H

P

UP

P

UD

L

L

VOB depends on VDDB

state

L

H

P

UP

P

UD

H

L

Note:

1. The EN pin needs to be pulled down with a 100 kΩ resistor externally to GND.

2. The chip can be powered through the PWM input ESD diodes even if VDDI is unpowered. It is recommended that inputs be left

unpowered when VDDI is unpowered. The EN pin has a special ESD circuit that prevents the IC from powering up through the

EN pin.

3. UD = undetermined if same side power is UP.

Si8239x Data Sheet

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