AN2846

Isolation management

Doc ID 15130 Rev 1

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4

Isolation management

There are two solutions proposed for galvanic isolation between the SCLT3-8 and the

microcontroller.

●

Opto-coupler isolation

●

Magnetic digital isolation

4.1

Opto-coupler isolation

The first solution is given by opto-couplers which must run at a bit rate compatible with the

SCK frequency and meet SCLT3-8 requirements in terms of consumption.

HCPL4506 or HCPL0466 can be a solution to drive a single SCLT3-8 for a 1 MHz

application.

Figure 33.

Single SCLT3-8 and HCPL4506 or 0466

be inserted to balance the different regulated output voltages. The load current is shared

SCK

/CS

/MISO

MOSI

MISO

MISO

/CS

SCK

3 k

1 k

750

Ω

750

HCPL4506

or 0466

Ω

Ω

Ω