Battery knowledge · Data, communication and electronics
I²C
A two-wire serial bus — one clock line and one data line, both pulled up — on which a controller addresses many small chips at 100 kbit/s, 400 kbit/s or faster. Inside a battery pack it links the fuel gauge, protection chip, memory and temperature sensors; SMBus is derived from it with tighter timing rules.
- Also called
- I2C, IIC, inter-integrated circuit, TWI, two-wire interface
Example
Data, communication and electronics: an example situation
2500 in a log might mean 25.00 °C, 2.5 V or raw counts. Units and scale must accompany the value.
Read I²C alongside Analog front end in this context. The integrated circuit that measures a stack of series cells — typically 6 to 18 per chip — with millivolt accuracy, reads thermistors, switches balancing and talks to the controller over an isolated daisy chain. It is the part of a BMS that touches the cells, and its accuracy limits how well SOC can be known.
Use in Lemonergy
Separate quantities from encoding and transport.
This is a reference concept. No executable Lemonergy block has been verified for this term.
References & further reading
Further reading on this topic
These sources provide broader context; they are not presented as citations for every statement in this entry.
- 3rd generation of the CAN data link layer
CAN in Automation, CAN Newsletter · 2020
Topic background · Classical CAN, CAN FD and CAN XL data-link concepts; publication describes the 2020 state.
- Getting Started with the BQ76925
Texas Instruments · 2019
Topic background · A concrete BMS analog front-end example: cell voltage, current, temperature measurement and MCU integration.