ZHCSD75D March 2014 – January 2018
These FETs are automatically turned off by the protector based on the detected hardware protection faults or by the fuel gauge based on detected firmware protection faults. This enables the gauge to be configured with effectively two levels of safety: the first level employing conservative protection settings to keep the cell within a safe operating area and the second level set to act as a fail-safe measure to prevent cell damage. Once the protection fault(s) is deemed to be cleared, the protector or fuel gauge will re-enable the applicable FET(s). Additionally, the FET drivers can be manually tested at production using the FETTest(0x74/0x75) extended command if needed.