6

Device description

The STISO621 is a dual high-speed isolated communication channel. It integrates one channel for each

communication direction and provides low levels of pulse width distortion in the full operation range.

6.1

Device operation

The device operation is described in the following table:

Table 9. Device operation table

VDD1

VDD2

TX1

RX2

TX2

RX1

Above UVLO

Above UVLO

H

H

H

H

L

L

H

H

H

H

L

L

L

L

L

L

Below UVLO

Above UVLO

X

L(1)

X

Unknown

Above UVLO

Below UVLO

X

Unknown

X

L(1)

Below UVLO

Below UVLO

X

Unknown

X

Unknown

1. Safe state imposed by default after the watchdog timeout.

Figure 3. Timing diagram

TXinput

RXoutput

VDD

TX/ 3

VDD

RX/ 2

VDD

RX/ 2

90 %

10 %

90 %

10 %

t

DLH

t

r

t

W

t

W

1/f

IN

t

f

t

DHL

STISO621

Device description

DS13394 - Rev 4

page 9/21