The LDC3114 periodically samples all active channels at the selected scan rate. The device can operate at eight different scan rates to meet various power consumption requirements, where a lower scan rate achieves lower power consumption.

In Normal Power Mode, the scan rate can be programmed to 80, 40, 20, or 10 SPS through Register NP_SCAN_RATE (Address 0x0D). Additionally through NPFSR bit field in the same register 160 SPS rate can be enabled which overrides the setting of NPSR but not the NPCS bit fields. The NPCS bit field allows to set the part in continuous sampling mode in Normal Power Mode only. When NPCS is set then the settings for NPSR and NPFSR are ignored.

In Low Power Mode, the scan rate can be programmed to 5, 2.5, 1.25, or 0.625 SPS through Register LP_SCAN_RATE (Address 0x0F). The mode is selected by setting the LPWRB pin to VDD (Normal Power) or ground (Low Power). In either mode, each button can be independently enabled through a bit in Register EN (Address 0x0C). Figure 6-9 shows the typical distribution of the scan rates.