CLT3-4B Datasheet, PDF (8/13 Pages) STMicroelectronics – Current limited over-voltage protected quad digital termination

Application information
CLT3-4B
The CLT3-4 and the 24 V bus power supply have the same ground COM = GND. The
reverse polarity of the power supply will shutdown the device. And the power supply resistor
R_C will limit the default current protecting the power supply pin V_C. Its dissipation will be less
than 0.2 W.
Then, the whole module supply voltage rating is extended to from 0 to 30 V to -30 to +30 V.
2.3
EMC considerations
Figure 9 gives a typical application diagram where output capacitors are used to increase
CLT device immunity against fast transient bursts.
Figure 11 gives the printed circuit board layout associated with this schematic.
Refer to AN2527 for EMC considerations.
Figure 9. Robust application diagram
24V
SUPPLY
V_CC
V_I
2 wires sensor
3 wires sensor
Contact switch
2 wires sensor
V_IN
R_I
R_I
V_C
R_C
R_I
R_I
1
COM
IN₁
ESD₁₂
IN₂
V_C
ESD_C
IN₃
ESD₃₄
IN₄
COM
COM
OUT₁
COM₁₂
OUT₂
COM
COM
OUT₃
COM₃₄
OUT₄
COM
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