I2C multiple Slave Issue

mahdhu kommu1

Other Parts Discussed in Thread: MSP430G2553

Hi,

this is Mahdhu.kommu,

I2C communication b/w single Master[PICCOLO F28069] and multiple slaves [MSP430G2553], communication is working fine,

my problem is to Disconnect the power supply [3.3v]of single slave or Disconnect the SCL and SDA lines of that Slave automatically Total communication is HANG.

All Slave SCL and SDA lines are combining and all Slaves power supply and grounds are combined

thanks Advance.

over 12 years ago

0 Gautam Iyer over 12 years ago

Guru 192875 points

Hi Madhu,

While removing the power supply of a particular slave please monitor the power line using DSO. Check whether there's any spike in power line or SDA or SCL. In short check for any line corruption.

Regards,

Gautam

0 mahdhu kommu1 over 12 years ago in reply to Gautam Iyer

Intellectual 640 points

Hi Gautam,

thanks for giving reply,

i check the SDA and SCL lines in Scope, getting the spikes

0 Gautam Iyer over 12 years ago in reply to mahdhu kommu1

Guru 192875 points

Mahdhu, check this link out: http://www.dsscircuits.com/articles/effects-of-varying-i2c-pull-up-resistors.html

Regards,

Gautam

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I2C multiple Slave Issue