STM8 I2C interface with M24512FDW

[arun23]

Posted on March 09, 2013 at 09:28

Hi ,

I'm using STM8L151C4 in my design. I have interfaced this with I2C EEPROM M24512FDW (ST make). Plz refer attachment for the schematic.  I had pulled the enable lines of the EEPROM ( E0, E1, E2) to high (3.3V) & set the slave address of EEPROM as 0XAF. I'm using R-Link Compiler (Raisonnance) & using its sample i2C code.   The problem is that the micro is not able to reach the slave EEPROM & the code hangs. I could not understand the reason for this behaviour. Could you help me out of this issue. Thanks Arunkumar.S

[arun23]

Posted on March 13, 2013 at 05:15

Hi ,

Any help on this.. Thanks,

[jdf25252]

Posted on March 13, 2013 at 15:39 You should reevaluate your choice of pull-up resistors.  The 24512 is going to have to sink 33 mA on each pin to drive the bus and is going to see 1.65 V as V In Low which is spec'd as 0.99 V MAX