In my project iam using AS1115 I2C based led driver.

i used smbus at 60khz clock time base is TIMER0, free timeout and scl low condition implemented.

devices working fine up to sometime,after that SDA line goes low(holded by led driver i think).

after that device is hangs over there.
can we force fully pullup the SDA line.
if we initialize SMBUS again,can we bring busline state to high.

please give a solution please urgent

a simple means to see which chip holds it would be to insert a 10k resistor in the trace between the two devices, if both are low it is the device with the pullup attached.

can we force fully pullup the SDA line.
sure, if you do not mind possibly burning a chip

two things:
what is the size of your pullup resistors?
make sure SCL and SDA are not configured push-pull

two things:
what is the size of your pullup resistors?
:4.7k.
make sure SCL and SDA are not configured push-pull
:configured as open drain

when SDA held at low,no clock running SCL line timer0 used as clock base.

when SDA held at low,no clock running
SDA is irrelevcant when the clock is not running

i captured data lines using Analyzer.
normally in the 9th clock pulse master receives ACK pulse.

In working procedure ACK received.

In failed condition in 9th pulse SCL line held continuously in HIGH state not came to low state.

slave device waiting for SCL low state to release SDA line(i.e low -> high).

please verify the images of bus signals
http://www.4shared.com/photo/8kyYumH_/failed.html
http://www.4shared.com/photo/rReSCRVX/working.html

did you reduce the pullups?
did you try the 10k in series?

can we control smbus pins by configure it as push pull. after it crossbar allocation.

I uploaded project in winrar format.
http://www.4shared.com/file/bAdnAegb/FEUGO_KODHADA.html

project description:
It is a industrial timer it switches solenoids
for a particular time.

solenoid settings were stored in I2C EEPROM.
these settings were red from eeprom, updated on led display these loop will run forever.

Regards
hari

I uploaded project in winrar format.
http://www.4shared.com/file/bAdnAegb/FEUGO_KODHADA.html
I do not want the amoumt of spam accessing such websites result in, post the code here

It is a industrial timer it switches solenoids
This makes it likely that your problem is noise. Does this ever happen when running the device on the bench with no solenoids attached