"An Integrated 50mΩ High Side Sense Resistor": So you can safe an external, un-calibrated sense resistor.
LTC2943 is not obsolete.
The two current measurement values you gave lead to following calculated values:
>>> (0x7D92-32767)/32767*60e-3/5e-3-0.22742393261513108>>> (0x7D90-32767)/32767*60e-3/5e-3-0.228156376842555
And the error versus your DMM measurement:
These devices are controlled by files in sysfs under /sys/class/power_supply
the ACR will not stop accumulating when decrementing below 0 or incrementing above FFFFh. This behavior is described in the datasheet on page 9, right column:
"The accumulated charge register (ACR) is compared to the charge thresholds every…
Found the problem. There was another device on the I2C bus with the same address (datasheet uses 0xC8 as address rather than 0x64). The second device was contending with the LTC2943 under certain conditions that matched the addresses listed above.
I plan to use the LTC4162-L42 for a two-cell Li-Ion device with LTC2943 as Battery Gas Gauge.
To control properly the gas gauge, I need the information that the battery charge is terminated. How can I get this information exactly ?
the LTC2943 has a 3.6V to 20V Operating Range that should also support 4-Cells Application. What exactly means "everything wrong"? Please provide schematic. Also scope shots of a "good" and "bad" I2C communication are helpful to understand…
LTC4162 sounds like a good choice for the battery app except that it does not have a balancing function. However, the balancing could be handled externally using an additional IC or possibly discrete circuitry.
As for your need for a coulomb…
The I-grade of the LTC2943 should not be operated above 85C die temp.
The 510K is just the scale factor for the temperature ADC results register -- see the info on page 14 of the datasheet for more info on reading a temperature result:
Thanks for the detailed response. For simplicity now, I think I'll nix the option of charging another device, as well as running on the USB power. I want to focus on the basic function of charging and monitoring a Li-Ion battery. Two Li-Ion batteries…