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PSoC™ 4 Forum Discussions

MaCa_285251
Level 1
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Hi everybody, we would like to use I2C FM+ on PSoC4.

Is it mandatory to use "I2C FM+" slew rate on I2C pins or the I2C FM+ specification can be met also using fast slew rate for example?

As far as I've understood the "I2C FM+" slew rate is only available on PSoCs with overvoltage tolerant IOs in 4100M, 4200M and 4200L families, while we would like to possibly use the 4100S or the "4100S plus" families.

Many thanks in advance for your support.

Marco

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Hari
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hi

The slew rate in PSoC 4100s and s plus devices cannot be configured to I2C FM+ as these do not have overvoltage tolerant IOs.

However, you can still configure datarate of 1000kHz (1Mbps) provided your bus complies with I2C bus characteristics specified by nxp. Please refer to the specification provided in the following document, page 47.

https://www.nxp.com/docs/en/user-guide/UM10204.pdf

Thanks and regards

Hari

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2 Replies
Hari
Moderator
Moderator
Moderator
750 replies posted 500 replies posted 250 solutions authored

Hi

The slew rate in PSoC 4100s and s plus devices cannot be configured to I2C FM+ as these do not have overvoltage tolerant IOs.

However, you can still configure datarate of 1000kHz (1Mbps) provided your bus complies with I2C bus characteristics specified by nxp. Please refer to the specification provided in the following document, page 47.

https://www.nxp.com/docs/en/user-guide/UM10204.pdf

Thanks and regards

Hari

Hi Hari,

many thanks for your reply.

Kind regards,

Marco

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