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General Description
3
SLUUC57A–October 2019–Revised June 2020
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BQ79600-Q1 Evaluation Module
1.2 Key Electrical Parameters
The following table identifies the key electrical parameters:
Table 1. Key Electrical Parameters
Parameter Value
Maximum operating voltage (BAT pin powered by battery) 24 V (J1 and J3 shunts placed in 1-2 position)
Minimum operating voltage (BAT pin powered by battery) 5.5 V (J1 and J3 shunts placed in 1-2 position)
Maximum operating voltage (BAT pin powered by 5-V regulator) 5.25 V (J1 and J3 shunts placed in 2-3 position)
Minimum operating voltage (BAT pin powered by 5-V regulator) 4.75 V (J1 and J3 shunts placed in 2-3 position)
Ambient temperature –40ºC to 105ºC
SPI clock frequency 2 Mbps to 6 Mbps
UART baud rate 1 Mbps
2 Theory of Operation
Figure 1 shows the system stack diagram.
Figure 1. System Block Diagram
The typical BMS system consists of a Battery Management Unit (BMU) and one or more stacked Cell
Monitoring Units (CMU). The BMU should be isolated from the CMU using transformers to keep the high
voltage of the stacked battery modules isolated from the BQ79600-Q1 bridge device and the
microcontroller.
The three components described below can be found on a typical BMU system, as shown in Figure 1.
• Host controller - in this case a TMS570 LaunchPad™
• Power management IC (PMIC)
• BQ79600-Q1 isolated communication bridge device - in this case a BQ79600EVM
The BQ79600 device can be powered from the 12-V battery directly or from a 5-V regulator/PMIC. When
powered from the 12-V battery, the automatic host wake-up function on the BQ79600 can be used in a
ring architecture to wake up the PMIC and the microcontroller when an unmasked fault is detected.
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