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Original question:

AM2431: AM2431 I2C slave configuration

AM2434: RC Network on I2C0 on AM2434 Launchpad causing problems (R93, R97)

Steve Squires
Intellectual 605 points

Part Number: AM2434

Hi,

We have been prototyping using the AM2434 Launchpad as the core (until we design our own) using the LP connectors.

Until now, we have been using the I2C1 bus quite successfully. However, we recently needed to switch over to I2C0 - this has not worked. We think it's related to the RC network on I2C0, specifically the 620 ohm series resistors (see below). Before we start modifying our LPs, we wanted some feedback on this as the root of our problems.

Below is a trace from the two busses - of note is the analog levels from LP pins 49 & 50 (I2C0) and 9 & 10 (I2C1). It appears that the voltage on the clock and data pins on I2C0 are not pulled below about 750mV. Is this the problem?

Thanks,

Steve