By Texas Instruments 72
Texas Instruments' bq77905 device is a low-power battery pack protector that implements a suite of voltage, current, and temperature protections without microcontroller (MCU) control. Protection thresholds and delays are factory-programmed and available in a variety of configurations. Separate over-temperature and under-temperature thresholds for discharge (OTD and UTD) and charge (OTC and UTC) are provided for added flexibility.
The device achieves pack protection via the integrated, independent CHG and DSG, low-side NMOS FET drivers, which may be disabled via two control pins. These control pins may also be used to achieve cell-protection solutions for higher series (6S and beyond) in a simple and economical manner. To do this, simply cascade a higher device's CHG and DSG outputs to the immediate lower device's control pins. For reduced component count, all protection faults use internal delay timers.
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