I2c access to LTC2990 voltage monitor device

[btsavage]

I have several devices on an I2C bus.  We can successfully communicate with all of them but the LTC2990 Voltage Monitor.  I have a TMP175 on the same bus that works perfectly. 

We are using Linux on the Zynq-7000.  My application for the TI TM175 does an open on /dev/i2c-1, calls ioctl(fd, I2C_SLAVE, addr) where addr is 0x4D.  The call to ioctl completes successfully.  I then try to write to the control register using write() and read the data using the read() call.

Both the read and write complete, but I can never read valid data.  Anyone have experience with this device?  I have V1-V2 as current monitoring, and V3, V4 as voltage monitoring. 

Thanks

Brian

[austin]

b,

Perhaps you should also ask Linear Technology?

[btsavage · Accepted solution]

There was an error in the datasheet wrt addressing. Once the addressing is done correctly, it works like a champ.