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AD7143

更新时间: 2024-11-24 04:04:15
品牌 Logo 应用领域
亚德诺 - ADI 传感器控制器
页数 文件大小 规格书
56页 697K
描述
Programmable Controller for Capacitance Touch Sensors

AD7143 数据手册

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Programmable Controller for  
Capacitance Touch Sensors  
AD7143  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
Programmable capacitance-to-digital converter  
25 ms update rate (@ maximum sequence length)  
Better than 1 fF resolution  
8 capacitance sensor input channels  
No external RC tuning components required  
Automatic conversion sequencer  
On-chip automatic calibration logic  
Automatic compensation for environmental changes  
Automatic adaptive threshold and sensitivity levels  
On-chip RAM to store calibration data  
I2C®-compatible serial interface  
Separate VDRIVE level for serial interface  
Interrupt output for host controller  
16-lead, 4 mm x 4 mm LFCSP-VQ  
POWER-ON  
RESET  
AD7143  
15  
16  
1
CIN0  
CIN1  
CIN2  
CIN3  
CIN4  
CIN5  
CIN6  
CIN7  
LOGIC  
CALIBRA-  
TION  
ENGINE  
16-BIT  
Σ-Δ  
CDC  
2
3
4
5
CALIBRA-  
TION  
9
VCC  
GND  
6
CONTROL  
AND  
RAM  
10  
DATA  
REGISTERS  
250kHz  
7
8
CSHIELD  
SRC  
EXCITATION  
SOURCE  
INTERRUPT  
LOGIC  
2
I C SERIAL INTERFACE  
AND CONTROL LOGIC  
2.6 V to 3.6 V supply voltage  
Low operating current  
11  
12  
13  
14  
Full power mode: less than 1 mA  
VDRIVE SDA SCLK  
INT  
Low power mode: 50 μA  
Figure 1.  
APPLICATIONS  
Personal music and multimedia players  
Cell phones  
Digital still cameras  
Smart hand-held devices  
Television, A/V, and remote controls  
Gaming consoles  
The AD7143 has on-chip calibration logic to account for  
changes in the ambient environment. The calibration sequence is  
performed automatically and at continuous intervals, while the  
sensors are not touched. This ensures that there are no false or  
nonregistering touches on the external sensors due to a  
changing environment.  
GENERAL DESCRIPTION  
The AD7143 is an integrated capacitance-to-digital converter  
(CDC) with on-chip environmental calibration for use in  
systems requiring a novel user input method. The AD7143  
interfaces to external capacitance sensors implementing  
functions, such as capacitive buttons, scroll bars, and  
scroll wheels.  
The AD7143 has an I2C-compatible serial interface and a  
separate VDRIVE pin for I2C serial interface operating voltages  
between 1.65 V and 3.6 V.  
The CDC has eight inputs channeled through a switch matrix to  
a 16-bit, 250 kHz sigma-delta (∑-Δ) capacitance-to-digital  
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 software to run on the host processor.  
The AD7143 is available in a 16-lead, 4 mm × 4 mm LFCSP-VQ  
and operates from a 2.6 V to 3.6 V supply. The operating  
current consumption is less than 1 mA, falling to 50 μA in low  
power mode (conversion interval of 400 ms).  
Rev. 0  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2007 Analog Devices, Inc. All rights reserved.  
 

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