Capacitive Sense

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Capacitive Touch Sense

Capacitive Sensing

Capacitive Sensing Overview
Silicon Labs' MCUs enable a rich set of capacitive sensing interfaces for your products human interface needs. The newest Silicon Labs patent-pending sensing technology offers

The world’s fastest Charge-Timing Capacitance to Digital Converter (CDC)
Excellent sensitivity
No external components
1.8 V to 3.6 V support
Silicon Labs' classic high-performance 25 MHz 8051

The C8051F700 family enables

Capacitive buttons
Sliders
Wheels
Proximity sensing
Liquid level sensing
Projected capacitance touch screens

The C8051F800 family enables

Capacitive buttons
Sliders
Wheels
Capacitive Proximity sensing
Liquid level sensing

Silicon Labs also offers the innovative C8051F900 low-voltage/low-power MCU family with support for the widely adopted relaxation oscillator capacitive sensing technique.

Available Products

MCU Family	Switches	MIPS*	Flash/ EPROM*	RAM*	Dig I/O*	CDC**	Dev Kit
C8051F7xx	32	25	16 kB	512	54	CT	C8051F700DK
C8051F8xx	16	25	16kB	512	17	CT	C8051F800DK
C8051F9xx	23	25	64 kB	4352	24	RO	C8051F930DK
C8051F30x	4	25	8 kB	256	8	RO	C8051F300DK
C8051F31x	8	25	16 kB	1280	29	RO	C8051F310DK
C8051F320/1	8	25	16 kB	2304	25	RO	C8051F320DK
C8051F330/1/2/3/4/5	8	25	16 kB	768	21	RO	C8051F330DK
C8051F336/7/8/9	8	25	16 kB	768	21	RO	C8051F336DK
C8051F34x	10	48	64 kB	5376	40	RO	C8051F340DK
C8051F35x	8	50	8 kB	768	17	RO	C8051F350DK
C8051F36x	8	100	32 kB	1280	39	RO	C8051F360DK
C8051F41x	12	50	16 kB	2304	24	RO	C8051F410DK
C8051F52x/53x	8	25	8 kB	256	16	RO	C8051F530ADK
C8051T60x	4	25	8 kB EPROM	256	8	RO	C8051T600DK
C8051T61x	8	25	16 kB EPROM	1280	29	RO	C8051T610DK

* Denotes maximum value in family
** CT denotes Charge-Timing CDC; RO denotes Relaxation Oscillator CDC

Other Resources

Application Notes

Capacitive Touch Sense Application Note (AN338)
Capacitive Touch Sense Example Firmware (AN338SW)
Understanding Capacitive Sensing Signal to Noise Ratios (AN367)
QuickSense Firmware API (AN366)
Baselining in the Capacitive Sensing Firmware API (AN418)
Designer's Guide for the Si1102 and Si1120 (AN442)
Printed Circuit Design Notes for Capacitive Sensing with the CS0 Module (AN447)

Training Material

C8051F70x Capacitive Touch Sense Overview- Learn how to implement the Capacitive Sensing technology using the C8051F70x/1x family.

Keyboard Evaluation Kit
The Keyboard Evaluation Kit introduces Silicon Labs new SAR CDC Capacitive Sense technology demonstrated with buttons, wheel and slider. The evaluation platform uses the new C8051F70x/71x high-pin count MCU device family.

KEYBOARD-EK

Capacitive Touch Sense Starter Kit and Daughter Card
The Capacitive Touch Sense Daughter Card includes four RO-based capacitive touch sense pads to enable customers to develop applications implementing capacitive touch sense switches. The Capacitive Touch Sense Starter Kit includes a Capacitive Touch Sense Daughter Card, ToolStick Base Adapter and USB cable. The Capacitive Touch Sense Daughter Card is also available individually for customers that already have a ToolStick Starter Kit.

Capacitive Touch Sense ToolStick Daughter Card User's Guide

Capacitive Touch Sense Starter Kit
Capacitive Touch Sense Daughter Card

The daughter card is pre-loaded with a game that requires you to mimic LED light sequences by entering the sequence via the capacitive touch sense pads.
Light Sequence Game

C8051F336 Development Kit
The development board in the C8051F336DK includes a Capacitive Touch Sense switch and example code. The development board provides an easy way to evaluate the solution.
C8051F336DK