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Programmable Touch Controller for

Single Electrode Capacitance Sensors

AD7148

Rev.

0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

©

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 (∑-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.

FUNCTIONAL BLOCK DIAGRAM

GND

VCC

VDRIVE

SDA

SCLK

SERIAL INTERFACE

AND CONTROL LOGIC

INTERRUPT

AND GPIO

LOGIC

POWER-ON

RESET

LOGIC

CALIBRATION

RAM

CONTROL

AND

DATA

REGISTERS

CALIBRATION

ENGINE

BIAS

6

7

8

ACSHIELD

5

CIN0 13

CIN1 14

CIN2 15

CIN3 16

CIN4

1

CIN5

2

CIN6

3

CIN7

4

9

10

11

12

INT

AD7148

16-BIT

Σ-Δ

CDC

EXCITATION

SOURCE

Figure 1.

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.

Số phần tương tự - AD7148ACPZ-1REEL

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