The LM74701-Q1 has SW pin to enable battery voltage monitoring in automotive systems. When the device is enabled, an internal switch connects SW pin to ANODE. This feature enables monitoring battery voltage using an external resistor divider connected from SW pin to GND. When LM74701-Q1 is put in shutdown mode by pulling down the EN pin low, an internal switch between SW and ANODE pin is disconnected. This action ensures there is no quiescent current drawn by the resistor ladder when system is put into low power shutdown mode. When not used, SW pin must be left floating.

Figure 8-3 LM74701-Q1 SW Pin Functionality