SLUUC57B october 2019 – august 2023 BQ79600-Q1
Figure 2-1 shows the system stack diagram.
The typical BMS system consists of a Battery Management Unit (BMU) and one or more stacked Cell Monitoring Units (CMU). The BMU must be isolated from the CMU using transformers to keep the high voltage of the stacked battery modules isolated from the BQ79600 bridge device and the microcontroller.
The typical simplified bridge circuit in the BMU system has three main components, as shown in Figure 2-1:
The BQ79600 device can be powered from the 12-V battery directly or from the PMIC. When powered from the 12-V battery, the reverse wake-up function on the BQ79600 can be used in a ring architecture to wake up the PMIC and the microcontroller with an unmasked fault is detected.
All commands and data between the host and the BQ79600 bridge device are communicated through either a UART or a SPI communication connection. The BQ79600EVM can support a host PC or microcontroller (via the FTDI connection header, the USB2ANY connection header, or the LAUNCHXL2-TMS57012 LaunchPad boosterpack). The BQ79600 remains idle until a command is received from the host. All commands and data between the BQ79600 and the cell monitoring devices, such as BQ79616, is communicated through the daisy chain interface.
The typical flow for the host to go through is the following simplified sequence: