8.4.1.3 SLEEP Mode

In SLEEP mode, the BQ79606A-Q1 has limited functionality. The functions are limited to :

• OV/UV and OT/UT Comparator
• Cell balancing
• SHUTDOWN Detection
• Fault Tone monitoring for the daisy chain interface (Daisy-Chain FAULT* Interface (Stack Devices))
• SLEEPtoACTIVE monitoring (signal on UART for base device or SLEEPtoACTIVE tone for stack device)
• WAKEUP (base device)/ WAKE tone (stack device) detection.
• GPIO FAULT
• NVM CRC

The comparators and Fault Tone monitoring must be enabled in ACTIVE mode before entering SLEEP mode. Once enabled, these functions remain active in SLEEP mode. If the functions are required to be disabled, the BQ79606A-Q1 must be commanded to ACTIVE mode to disable the functions.

While in SLEEP, the BQ79606A-Q1 monitors the WAKEUP input and the UART interface (for a stand-alone or base device) or the COMx inputs (for stack devices) for a WAKE or SLEEPtoACTIVE signal (Stack Device Wakeup and Hardware Shutdown). When a SLEEPtoACTIVE signal is received, either by UART interface or a SLEEPtoACTIVE tone on the daisy-chain, the BQ79606A-Q1 transitions to ACTIVE mode without resetting any internal settings. If a WAKEUP signal is received, either by the WAKEUP input or the WAKE tone on the daisy-chain, the BQ79606A-Q1 resets all of its settings to the system defaults and transitions to ACTIVE mode. Table 6 specifies all of the circuits and functionality that are enabled or available in SLEEP mode. Table 24 specifies the mode transition for SLEEP mode response to the different tones for stack devices. Table 23 specifies the mode transition for SLEEP mode response to the different signals for base devices.