SMBus, SBS, I2CWrite, I2CRead

[astouffer]

dsicon, sorry for replying to an old thread but I just wanted to get a bit of clarification. The bit of code you posted works as is when the clock runs at 2Mhz? I'm starting a project that involves interfacing to a smart battery pack via the SMBus and there wasn't much in the way of examples.

[dsicon]

Hi astouffer, this project is still alive for me!
i run the main loop at 8Mhz RC clock
when i call a gosub to do the SMBus via I2CREAD I2CWRITE in the gosub at the top i switch to 2MHz RC OSC on the fly and just before the RETURN i switch it back to 8MHz
this was VERY hard won for me at least, it was all proven empirically, 1 & 4MHz did not work, at least not reliably, 2Mhz seems quite solid
if there is anything else let me know
what is your operating voltage for the PIC ?
what is the batt voltage and Watt hours? (shouldn't matter much unless maybe is only one cell, just curious)
what is the fuel gauge chip in the battery?

[astouffer]

The PIC will be a power supervisor in this application and we're going with two of these battery packs http://www.cell-con.com/pdf/D90494_DataSheet_BP.pdf.

What voltage does the SMBus use? If its 5 volts then that will be the PIC voltage. The PIC is going to monitor the battery time remaining and have some status LEDs and probably watch the temperature as well. If the batteries get too low then its going to disconnect the equipment. Nothing real fancy. I'm not sure what fuel monitor chip the batteries have but they do have 24 possible values to read from.