Regardless of which EMSHUT entry method is used, the gauge can exit the EMSHUT mode by turning on the CHG and DSG FETs with any one of the following conditions:
- A high-to-low transition on the SHUTDN pin is detected with a debounce delay of 1 s for the low level threshold. For example, a push button is pressed again. This exit condition can be disabled by setting the [EMSHUT_PEXIT_DIS] bit in the DA Configuration register.
- Send word 0x23A7 to ManufacturerAccess() (0x00).
- PACK voltage > Charger Present Threshold for two sample periods (that is, ~500 ms). This exit condition requires the [EMSHUT_EXIT_VPACK] bit to be set.
- Valid SMBus communication is received. Valid SMBus communication means a valid gauge address and any command is received (that is, an invalid command with a valid address is OK). This exit condition requires the [EMSHUT_EXIT_COMM] bit to be set. When using this exit option, the Manual FET Control (MFC) Delay should be set to a minimum of 4 seconds.
In EMSHUT mode, to detect the voltage level at the PACK pin quickly (even while in SLEEP), the AD conversion will occur every second.