The typical flow is for the host to go through the following simplified sequence:
1. Wakeup the BQ75614EVM board by sending a WAKEUP pulse when using the UART interface.
2. Send a sample command to the BQ75614-Q1 to read the cell measurement results and current
measurement results.
3. The host will use the cell measurement data to calculate an average and determine the highest or lowest
cells and determine the cells that should be balanced. The host will use the current measurement data to
estimate SOC and SOH.
4. If no stop command is sent, the BQ75614-Q1 has a built-in timeout (set by the user), after which time the
discharge will be stopped automatically.
5. The host can then decide to repeat the process (back to step 2) or send commands to shutdown the
BQ75614EVM and return later.
As a single standalone board, the BQ75614EVM can passively balance up to 16 cells, up to 80 V of total
voltage. Communication to the BQ75614EVM is handled by the UART host interface.
Theory of Operation - Standalone BQ75614EVM
10
BQ79616-Q1, BQ75614-Q1, and BQ79656-Q1 Evaluation Modules
SLUUC37B – JULY 2019 – REVISED OCTOBER 2020
Copyright © 2020 Texas Instruments Incorporated
