8.4.2.1 SHUTDOWN Mode

In SHUTDOWN mode, the SE pin is used to signal the external circuit to power-off the fuel gauge. This feature is useful to shut down the fuel gauge in a deeply discharged battery to protect the battery. By default, SHUTDOWN mode is in NORMAL state. By sending the SET_SHUTDOWN subcommand or setting the [SE_EN] bit in the Pack Configuration register, the [SHUTDWN] bit is set and enables the shutdown feature. When this feature is enabled and [INTSEL] is set, the SE pin can be in NORMAL state or SHUTDOWN state. The SHUTDOWN state can be entered in HIBERNATE mode (only if HIBERNATE mode is enabled due to low cell voltage). All other power modes will default the SE pin to NORMAL state. Table 3 shows the SE pin state in NORMAL or SHUTDOWN mode. The CLEAR_SHUTDOWN subcommand or clearing [SE_EN] bit in the Pack Configuration register can be used to disable SHUTDOWN mode.

The SE pin will be high impedance at power-on reset (POR), and the [SE_POL] does not affect the state of SE pin at POR. Also, [SE_PU] configuration changes will only take effect after POR. In addition, the [INTSEL] only controls the behavior of the SE pin; it does not affect the function of [SE] and [SHUTDWN] bits.