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PSoC™ 4 Forum Discussions

YuMa_1534086
Level 6
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Hello Cypress.

Could you please let us know recommended range of CSX parasitic capacitance(TX, RX, Cm) which PSoC can support?

Best Regards.

Yutaka Matsubara

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RyanZhao
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Matsubara-san,

The maximum Cm supported by PSoC CSX is 1000 pF,

Best Regards,

Ryan

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RyanZhao
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Matsubara-san,

Cm has to be roughly above 1pF. Lower Cm values have charge sharing problems. Higher Cm values lead to more noise. For the high limitation of Cm, let me double-check.

Thanks,

Ryan

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RyanZhao
Moderator
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750 replies posted 100 sign-ins 100 likes received

Matsubara-san,

The maximum Cm supported by PSoC CSX is 1000 pF,

Best Regards,

Ryan

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Dear Ryan-san.

Q1)

CSD recommended parasitic capacitance range(Cp) differs by device family.

Is recommended Cm range(1pF – 1000pF) same for all PSoC4 device family?

If recommend range differs by device family, could you please let us know about recommended Cm range in each family?

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Q2)

In CSX, is there any limitation for parasitic capacitance range of TX and RX?

Is there a recommend parasitic capacitance range of TX and RX.

Or is it possible to judge whether or not CSX can drive correctly only by Cm value?

(Is not there any limitation for parasitic capacitance range of TX and RX?)

Best Regards.

Yutaka Matsubara

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Matsubara-san,

A1) 1pF-1000pF is mainly assessed on PSoC4000S/4100S, PSoC4100PS, PSoC 6 series.

        For PSoC 4, 4-M, 4-BLE and 4-L, don't have enough proof to get the same range.

A2) No. There is no parasitic capacitance range of TX and RX. But it is required to make sure both Tx and Rx: 1/(10*Rseries*C) > Tx frequency.

Best Regards,

Ryan

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Ryan-san.

Thank you for your reply.

I understand.

Best Regards.

Yutaka Matsubara

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