CPT112S datasheet(33/35 Pages) SILABS

33 / 35 page

Table of Contents

1. Feature List and Ordering Information ...................... 1

2. Typical Connection Diagrams ......................... 2

2.1 Signal, Analog, and Power connections ..................... 2

2.2 Configuration .............................. 3

3. Electrical Specifications ........................... 4

3.1 Electrical Characteristics .......................... 4

3.1.1 Recommended Operating Conditions ..................... 4

3.1.2 Power Consumption ........................... 5

3.1.3 Reset and Supply Monitor ......................... 6

3.1.4 Configuration Memory .......................... 6

3.1.5 Capacitive Sense ............................ 7

3.1.6 Buzzer Output ............................. 8

3.2 Thermal Conditions ............................ 8

3.3 Absolute Maximum Ratings ......................... 9

3.4 Typical Performance Curves .........................10

4. Functional Description...........................

4.1 Capacitive Sensing Input ..........................13

4.1.1 Introduction ..............................13

4.1.2 Touch Qualification Criteria.........................13

4.1.3 Thresholds ..............................13

4.1.4 Debounce Counter

...........................14

4.1.5 Touch Deltas

.............................14

4.1.6 Auto-Accumulation and Averaging ......................14

4.1.7 Drive strength .............................14

4.1.8 Active Mode Scan Enable .........................14

4.1.9 Active Mode Scan Period .........................14

4.1.10 Active Mode Scan Type .........................15

4.1.11 Sleep Mode Scan Period .........................15

4.1.12 Active Mode and Sleep Mode Transitions ...................16

4.2 I2C Event Buffer Interface ..........................17

4.2.1 Introduction ..............................17

4.2.2 Packet Retrieval ............................17

4.2.3 Event Packet Structure ..........................18

4.2.4 Defined Event Types ...........................19

4.2.5 Description Bytes for Touch Events ......................19

4.2.6 Description Bytes for Slider Events ......................19

4.2.7 Event Buffer I2C Slave Address .......................19

4.3 Capacitive Proximity Sensing.........................20

4.3.1 Wake on Proximity

...........................20

4.3.2 Proximity Configuration ..........................20

4.4 Slider .................................20

4.5 Touch Time-Out .............................21

Table of Contents

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