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AN2846 датащи(PDF) 25 Page - STMicroelectronics

номер детали AN2846
подробное описание детали  The serial current limited termination device
PDF  35 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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AN2846 датащи(HTML) 25 Page - STMicroelectronics

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AN2846
Isolation management
Doc ID 15130 Rev 1
25/35
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
If several SCLT3-8s are used, more current is available through VDD pins to supply the opto-
couplers. The different outputs VDD can be tied together but, low serial resistors (22 Ω) must
be inserted to balance the different regulated output voltages. The load current is shared
between the two SCLT3s and allows the voltage drop reduction across each RC resistor.
VC
SCK
/CS
/MISO
MOSI
MISO
VCC
MISO
/CS
SCK
3 k
1 k
750
Ω
750
HCPL4506
or 0466
VDD
VDD2
Ω
Ω
Ω



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