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AD7147A

Analog Devices
Part Number AD7147A
Manufacturer Analog Devices
Description CapTouch Programmable Controller
Published Jul 3, 2010
Detailed Description CapTouch Programmable Controller for Single-Electrode Capacitance Sensors AD7147A SWITCH MATRIX 06663-001 FEATURES Pro...
Datasheet PDF File AD7147A PDF File

AD7147A
AD7147A

Overview
CapTouch Programmable Controller for Single-Electrode Capacitance Sensors AD7147A SWITCH MATRIX 06663-001 FEATURES Programmable capacitance-to-digital converter (CDC) Femtofarad (fF) resolution 13 capacitance sensor inputs 9 ms update rate, all 13 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 is compatible with the AD714x On-chip RAM to store calibration data Serial peripheral interface (SPI) (AD7147A) I2C-compatible serial interface (AD7147A-1) Separate VDRIVE level for serial interface Interrupt output and general-purpose input/output (GPIO) 25-ball, 2.
3 mm × 2.
1 mm WLCSP 2.
6 V to 3.
6 V supply voltage Low operating current Full power mode: 1 mA Low power mode: 28.
96 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 AD7147A CapTouch™ controller is designed for use with capacitance sensors implementing functions such as buttons, scroll bars, and wheels.
The sensors need only one PCB layer, enabling ultrathin applications.
The AD7147A is an integrated CDC with on-chip environmental calibration.
The CDC has 13 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.
By programming the registers, the user has full control over the CDC setup.
High resolution sensors require minor software to run on the host processor and may require two PCB layers.
CIN0 D3 CIN1 A3 CIN2 B3 CIN3 A4 CIN4 C3 CIN5 A5 CIN6 B4 CIN7 B5 CIN8 C4 CIN9 C5 CIN10 D4 CIN11 D5 CIN12 E5 FUNCTIONAL BLOCK DIAGRAM ACSHIELD VCC GND E4 D2 E2 BIAS E3 POWER-ON RESET LOGIC EXCITATION SOURCE AD7147A CALIBRATION RAM ...


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