topic Re: LIN pin capicitance on S12ZVL in S12 / MagniV Microcontrollers

LIN pin capicitance on S12ZVL

rajivbandodkar — Wed, 15 Feb 2017 06:19:02 GMT

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.

Re: LIN pin capicitance on S12ZVL

danielmartynek — Thu, 16 Feb 2017 10:09:54 GMT

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

Re: LIN pin capicitance on S12ZVL

rajivbandodkar — Thu, 16 Feb 2017 10:45:42 GMT

Thanks, clear,

Regards

Rajiv Bandodkar.