C8051F970-A-GM Datasheet, PDF (4/454 Pages) Silicon Laboratories – Low Power Capacitive Sensing MCU with up to 32 kB of Flash

C8051F97x
17.1.ADC0 Analog Multiplexer........................................................................................... 105
17.2.Output Code Formatting ............................................................................................ 106
17.3.Modes of Operation ................................................................................................... 107
17.3.1.Starting a Conversion ........................................................................................107
17.3.2.Tracking Modes ................................................................................................. 108
17.3.3.Burst Mode ........................................................................................................ 109
17.3.4.Settling Time Requirements .............................................................................. 110
17.3.5.Gain Setting....................................................................................................... 110
17.4.8-Bit Mode.................................................................................................................. 110
17.5.Low Power Mode ....................................................................................................... 111
17.6.Window Detector In Single-Ended Mode ...................................................................111
17.7.Voltage Reference ..................................................................................................... 112
17.7.1.External Voltage Reference............................................................................... 112
17.7.2.Internal Voltage Reference................................................................................ 113
17.8.Temperature Sensor .................................................................................................. 113
17.8.1.Calibration ......................................................................................................... 113
17.9.ADC Control Registers...............................................................................................114
17.10.Voltage Reference Registers ................................................................................... 127
17.11.Temperature Sensor Registers................................................................................ 128
18. Capacitive Sense (CS0) ................................................................................................... 130
18.1.Configuring Port Pins as Capacitive Sense Inputs .................................................... 131
18.2.Initializing the Capacitive Sensing Peripheral ............................................................131
18.3.Capacitive Sense Start-Of-Conversion Sources........................................................ 131
18.4.CS0 Multiple Channel Enable .................................................................................... 132
18.5.CS0 Gain Adjustment ................................................................................................ 132
18.6.Wake from Suspend .................................................................................................. 132
18.7.Using CS0 in Applications that Utilize Sleep Mode.................................................... 132
18.8.Automatic Scanning (Method 1—CS0SMEN = 0) .....................................................132
18.9.Automatic Scanning (Method 2—CS0SMEN = 1) .....................................................134
18.10.CS0 Comparator ......................................................................................................134
18.11.CS0 Conversion Accumulator.................................................................................. 135
18.12.CS0 Pin Monitor....................................................................................................... 136
18.13.Adjusting CS0 For Special Situations ...................................................................... 137
18.13.1.Adjusting the CS0 Reset Timing...................................................................... 137
18.13.2.Adjusting Primary Reset Timing: CS0DT ........................................................ 137
18.13.3.Adjusting Secondary Reset Timing: CS0DR ................................................... 138
18.13.4.Adjusting CS0 Ramp Timing: CS0IA ............................................................... 138
18.13.5.Low-Pass Filter Adjustments ........................................................................... 139
18.13.6.Adjusting CS0 Ramp Timing: CS0RP ............................................................. 139
18.13.7.Adjusting CS0LP for Non-Default CS0RP Settings ......................................... 139
18.13.8.Other Options for Adjusting CS0LP................................................................. 139
18.14.CS0 Analog Multiplexer ........................................................................................... 140
18.14.1.Pin Configuration for CS0 Measurements Method .......................................... 142
18.15.Capacitive Sense Registers..................................................................................... 143
19. Analog Multiplexer (AMUX0)........................................................................................... 158
19.1.AMUX Control Registers............................................................................................ 159
4
Rev 1.0