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AD7147A Dataheets PDF



Part Number AD7147A
Manufacturers Analog Devices
Logo Analog Devices
Description CapTouch Programmable Controller
Datasheet AD7147A DatasheetAD7147A Datasheet (PDF)

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 t.

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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 16-BIT Σ-Δ CDC CALIBRATION ENGINE CONTROL AND DATA REGISTERS VDRIVE C2 SERIAL INTERFACE AND CONTROL LOGIC INTERRUPT AND GPIO LOGIC B2 TP A2 GPIO E1 D1 C1 B1 A1 SDO SDI SCLK CS (SDA) (ADD0) (ADD1) INT NOTES 1. PIN NAMES IN PARENTHESES ARE FOR THE AD7147A-1. Figure 1. The AD7147A is designed for single electrode capacitance sensors (grounded sensors). There is an active shield output to minimize noise pickup in the sensor. The AD7147A 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 AD7147A has an SPI-compatible serial interface, and the AD7147A-1 has an I2C®-compatible serial interface. Both parts have an interrupt output, as well as a GPIO. There is a VDRIVE pin to set the voltage level for the seri.


L7650S AD7147A ADIS16360


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