OVERVIEW
The MPR083 is an Inter-Integrated Circuit Communication (I2C) driven Capacitive Touch Sensor Controller, optimized to manage an 8-position rotary shaped capacitive array. The device can accommodate a wide range of implementations through 3 output mechanisms, and many configurable options.

Features
*1.8 V to 3.6 V operation
*41 μA average supply current with 1 s response time
*2 μA Standby Current
*Variable low power mode response time (32 ms – 4 s)
*Rejects unwanted multi-key detections from EMI events such as PA bursts or user handling
*Ongoing pad analysis and detection is not reset by EMI events
*Data is buffered in a FIFO for shortest access time
*IRQ output advises when FIFO has data
*System can set interrupt behavior as immediate after event, or program a minimum time between successive interrupts
*Current rotary position is always available on demand for pollingbased systems
*Sounder output can be enabled to generate key-click sound when rotary is touched
*Two hardware selectable I2C addresses allowing two devices on a single I2C bus
*Configurable real-time auto calibration
*5 mm x 5 mm x 1 mm 16 lead QFN package
*-40°C to +85°C operating temperature range
 
Implementations
*Control Panels
*Switch Replacements
*Rotary and Linear Sliders

Typical Applications
*Appliances
*PC Peripherals
*Access Controls
*MP3 Players
*Remote Controls
*Mobile Phones

MPR083Q, MPR083EJ

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FEATURES
Programmable capacitance-to-digital converter (CDC)
Femtofarad (fF) resolution 8 capacitance sensor inputs
25 ms update rate, all 8 sensor inputs
No external RC components required
Automatic conversion sequencer
On-chip automatic calibration logic
Automatic compensation for environmental changes
Automatic adaptive threshold and sensitivity levels
Register map compatible with AD7143
On-chip RAM to store calibration data
I2C-compatible serial interface Separate VDRIVE level for serial interface
Interrupt output
16-lead, 4 mm × 4 mm LFCSP
2.6 V to 3.3 V supply voltage
Low operating current
Full power mode: 1 mA Low power mode: 21.5 μA

APPLICATIONS
Cell phones
Personal music and multimedia players
Smart handheld devices
Television, A/V, and remote controls
Gaming consoles
Digital still cameras

GENERAL DESCRIPTION
The AD7148 is designed for use with capacitance sensors imple- menting functions such as buttons, scroll bars, and wheels.
The sensors need only one PCB layer, enabling ultrathin applications. The AD7148 is an integrated capacitance-to-digital converter (CDC) with on-chip environmental calibration. The CDC has eight inputs channeled through a switch matrix to a 16-bit, 250 kHz sigma-delta (Σ-Δ) converter. The CDC is capable of sensing changes in the capacitance of the external sensors and uses this information to register a sensor activation. The external sensors can be arranged as a series of buttons, as a scroll bar or wheel, or as a combination of sensor types. By programming the registers, the user has full control over the CDC setup.
High resolution sensors require minimal software to run on the host processor.
The AD7148 is designed for single electrode capacitance sensors (grounded sensors). There is an active shield output to minimize noise pickup in the sensor. For floating, or two, electrode sensors, use the AD7143.
The AD7148 has on-chip calibration logic to compensate for changes in the ambient environment. The calibration sequence is performed automatically and at continuous intervals as long as the sensors are not touched. This ensures that there are no false or nonregistering touches on the external sensors due to a changing environment. The AD7148 has an I2C®-compatible serial interface, as well as an interrupt output. There is a VDRIVE pin to set the voltage level for the serial interface independent of VCC.
The AD7148 is available in a 16-lead, 4 mm × 4 mm LFCSP and operates from a 2.6 V to 3.6 V supply. The operating current consumption in low power mode is typically 26 μA.

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