Capacitive Switches - Xycap Dccs Digitally Controlled Capacitive Switching

Xymox now offers capacitive touch as an interface solution in addition to stock membrane switches and custom membrane swtiches. In some cases a capacitive touch solution may be preferred due to its light touch, durability, sealability, ease of use with front surfaces such as glass, and the option to design in scroll wheel type features.

Xycap Digital Controlled Capacitive Switch Key Features

The XyCap Digitally Controlled Capacitive Switches solution offers some unique features when compared to other capacitive chips, especially when you consider that Xymox can provide the total solution for you - from design thru full assembly build.

XyCap Capacitive Switch Features

• Operates fully in digital domain
• Low power consumption
• Fast response time
• Able to configure multiple key sensitivities within a keypad
• Small key design available - down to 1mm square
• High level of ESD protection

DCC (Digital Contact Controller) is a touch sensor IC which will convert capacitance generated between the human body and a conductive touch pad to digital data without any analog signal processing. The DCC chip is supplied through a Xymox agreement with Fujitsu Microelectronics America, Inc. and it includes proprietary technology of ATLab, Inc., Korea, that compares reference and sensor input impedances to detect touch, all in the digital domain. As the second generation touch sensor IC, the FMA1127 provides numerous new features compared to its predecessor.

Its programmability increases design flexibility and gives better performance and stability for a broader range of applications.

XyCap Is Water Resistant

The controller is water resistant and can be implemented with a variety of materials, making the technology an ideal choice for handheld healthcare products, home appliances or other applications

Other Capacitive Switches	Our Capacitive Switches

Xycap AIC (Automatic Impedance Calibration) Feature

The FMA1127’s AIC™ (Automatic Impedance Calibration) function can be easily configured to support different sensitivities for individual channels independently as well as to change values of parameters such as calibration interval. AIC may also be temporarily paused and resumed by a host MCU.

XyCap APIS (Adjacent Pattern Interference Suppression) Feature

Among the many new features of FMA1127, APIS™ (Adjacent Pattern Interference Suppression) is a filtering function to eliminate adjacent key or pattern interference. The FMA1127 also gives touch-strength output in addition to touch on/off output. There are a number of general-purpose DIOs depending on package type that can be configured and programmed to meet customer’s specific needs. This gives customers greater flexibility and value.

APIS Mode 1 (Reads Strongest Touch Only)
APIS Mode 2 (Reads Touches That Exceed A Threshold Value)
APIS Mode 3 (Reads 2 Strongest Touches)

Specifications

• Wide voltage range of 2.5V to 5.5V
• Current < 0.15mA
• Response time as fast as 0.2msec
• Recommended operating temperature: -35°C to +85°C
• No ground is required for touch pad
• No false key activations when exposed to moisture
• Flexibility to choose digital I/O from 12/8/6/3/2 each and sensor inputs 12/9/6 each based on package
• Automatically adjusts sensor sensitivity to cope with various operating environment
• No external clock source is required
• Supports idle and sleep/suspension modes for power saving
• Extra ESD protection (8kV for chip/contact and 15kV for system/air)
• RoHS compliant (lead-free package)
• Patented fully digital architecture
• Supports 12 input channels (40QFN and 30SSOP) or 9 input channels (32QFN and 24SSOP) or 6 input channels (24QFN and 20SSOP)
• Programmable registers to characterize applications
• I2C interface with the host MCU
• Two types of interrupts (GINT for general purpose and TINT for touch detection)
• 8-bit resolution of touch strength data (256 steps)
• Configurable DIO pins as direct touch outputs, extended GPIOs, or external interrupt inputs.
• Beep generation
• Idle and Sleep modes for power saving
• De-bounced touch outputs

Part Number Details

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