5. The host can then decide to repeat the process (back to step 2) or send commands to shutdown the
BQ79616EVM and return later.
2.1 Single Board
As a single board the BMS can passively balance up to 16 cells, up to 80 V of total voltage. Communication to
the BQ79616EVM is handled by the daisy-chain communications bus from another BQ79616-Q1 or the UART
host interface.
2.2 Stacked Systems
The boards may be stacked in daisy chain to accomodate larger battery packs than the 16 channels provide on
a single board. Communication to the BQ79616EVM is handled by the daisy-chain communications bus from
another BQ79616-Q1.
2.3 Configuring the BQ79616-Q1 EVM to be used for Lower Cell Count Applications
The BQ79616-Q1 EVM can be configured to support lower cell count applications, especially for users designing
with the BQ79614-Q1/BQ79612-Q1 devices. For these cases, the EVM comes fitted with placeholder 0 ohm
resistors for shorting together the VC and CB pins of the topmost cells. These can be found in the schematic at
the bottom of this user guide, with a note "Resistors for Lower Cell Count Applications". The user will need to
populate the 0 ohm resistors depending the use of 12 or 14 cells. For 14, the user would populate only R24,
R28, R22, and R26 whereas for 12 the user would populate all 8 of the resistors (R24, R28, R22, R26, R21,
R23, R25, R27). The GUI is also implemented with a feature to change the active cell configuration. Navigate to
the cell monitor page to "View Poll Settings" and then select their desired active cell configuration by using the
dropdown selection below the "No. of cells" column.
Theory of Operation - Stackable BQ79616EVM
8
BQ79616-Q1, BQ75614-Q1, and BQ79656-Q1 Evaluation Modules
SLUUC37B – JULY 2019 – REVISED OCTOBER 2020
Copyright © 2020 Texas Instruments Incorporated
