LIN pin capicitance on S12ZVL

[rajivbandodkar]

Refer to the speck on LIN Phy in electrical section of S12ZVL reference manual. There are two specks: 

1. Maximum capacitance allowed on slave node including external components   Nominal    220 pF

                                                                                                                                    Max         250 pF

2.Capacitance of the LIN pin, Recessive state                                                         Nominal    20 pF

                                                                                                                                    Max         45 pF

There is a confusion weather 220pF can be used as 220+45 = 265 pF. This value is more than 250pF allowed...

Please clarify...

Regards,

Rajiv Bandodkar.

[rajivbandodkar]

Thanks, clear,

Regards

Rajiv Bandodkar.

[danielmartynek]

Hi

The capacitance of the slave node defines the total node capacitance at the connector of the slave unit including the physical bus driver (Transceiver) and all other components applied to the LIN bus pin like capacitors or protection circuitry.

In other words, C_slave (250pF) is maximal capacitance of the slave node, which includes capacitance of the LIN pin (45pF max) and the rest (205pF) is left for a protection circuitry etc.  

Regards

Daniel