When the LPWRB input pin is set to ground, only the low-power-enabled channels are active. Each channel can be enabled independently to operate in Low Power Mode through Register EN (Address 0x0C). For a channel to operate in the Low Power Mode, both the LPENn and ENn bits (n is the channel index) must be set to 1. The Low Power Mode allows for energy-saving monitoring of button activity. In this mode, the device is in an inactive power-saving state for the majority of the time. Lower scan rates correspond to lower current consumption. In addition, the individual button sampling window should be set to the lowest effective setting (this is system dependent, but typically 0.8 ms to 1 ms). For the electrical specification of the configurable Low Power Mode Scan Rate, refer to the Section 6.5 table.

If a channel is operational in both Low Power Mode and Normal Power Mode, TI recommends to toggle the LPWRB pin only after the button associated with that channel is released.

The Low Power Mode is also applicable for raw data access mode.