L6360 datasheet(62/65 Pages) STMICROELECTRONICS

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EMC protection considerations

L6360

62/65

Doc ID 022817 Rev 2

If an extended protection level is required, the solution seen in Figure 48 is recommended. It

provides robust protection according to IEC61131-2. It is suitable for IO-Link communication

and is backward compatible with SIO (standard I/O). It protects the L6360 application

against high energy surge pulses according to the IEC61000-4-5 standard. All the lines are

protected against ±2.5 kV surge pulse amplitude in common mode and ±1 kV in differential

mode considering 42

Ω/0.5 μF generator coupling.

Figure 48.

IO-Link and SIO applications extended protection

Table 36.

IO-Link and SIO applications extended protection component description

Part

Function

Description

C_I/Q, C_C/Q, C_L+

Filtration capacitors

Work as a basic protection against fast transient signals like burst

or radio-frequency domain applied to the lines. Limit voltage spike

frequency spectrum and amplitude.

D_I/Q, D_C/Q

Negative voltage spike

suppression

Schottky diodes with low VF clamp the disturbance applied to the

lines in a reverse polarity direction. Capable of conducting high

surge current pulses to avoid high peak current flow through

L6360 pins.

R_I/Q

Surge current limitation

Reduces the current flow in the L6360 - the I/Q pin in both

polarities when e.g. surge noise is applied to the line. If this

resistor is omitted, the I/Q line surge immunity is lower.

U2 (SPT01-335DEE) Overvoltage protection

Primary surge protection to avoid overvoltage on the L6360

interface. Protects L+ switch against negative voltage pulses.

Shares current flow of negative surge pulses with the additional

Schottky diodes on C/Q and I/Q lines. Clamps positive surge

pulse amplitude applied to I/Q line.

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