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AD7147ACPZ-500RL7 PDF预览

AD7147ACPZ-500RL7

更新时间: 2024-11-04 04:04:15
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68页 940K
描述
CapTouch⑩ Programmable Controller for Single-Electrode Capacitance Sensors

AD7147ACPZ-500RL7 数据手册

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CapTouchProgrammable Controller for  
Single-Electrode Capacitance Sensors  
AD7147  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
AC  
V
GND  
10  
BIAS  
9
SHIELD  
CC  
Programmable capacitance-to-digital converter (CDC)  
Femtofarad resolution  
8
11  
POWER-ON  
RESET LOGIC  
13 capacitance sensor inputs  
19  
20  
21  
22  
23  
24  
1
CIN0  
CIN1  
CIN2  
CIN3  
CIN4  
CIN5  
CIN6  
CIN7  
CIN8  
CIN9  
CIN10  
CIN11  
CIN12  
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 AD7142  
On-chip RAM to store calibration data  
SPI-compatible (serial-peripheral-interface-compatible)  
serial interface (AD7147)  
I2C-compatible serial interface (AD7147-1)  
Separate VDRIVE level for serial interface  
Interrupt output and general-purpose input/output (GPIO)  
24-lead, 4 mm × 4 mm LFCSP  
EXCITATION  
SOURCE  
CALIBRATION  
AD7147  
RAM  
2
3
16-BIT  
Σ-Δ  
CDC  
CALIBRATION  
ENGINE  
4
5
6
CONTROL  
AND DATA  
REGISTERS  
7
2.6 V to 3.3 V supply voltage  
INTERRUPT  
AND GPIO  
LOGIC  
Low operating current  
Full power mode: 1 mA  
SERIAL INTERFACE  
AND CONTROL LOGIC  
12  
18  
GPIO  
V
DRIVE  
Low power mode: 21.5 μA  
13  
14  
15  
16  
17  
SDO/ SDI/ SCLK CS/  
SDA ADD0 ADD1  
INT  
APPLICATIONS  
Cell phones  
Figure 1. AD7147 Block Diagram  
Personal music and multimedia players  
Smart handheld devices  
Television, A/V, and remote controls  
Gaming consoles  
The AD7147 is designed for single-electrode capacitance  
sensors (grounded sensors). There is an active shield output to  
minimize noise pickup in the sensor.  
Digital still cameras  
The AD7147 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.  
GENERAL DESCRIPTION  
The AD7147 is designed for use with capacitance sensors  
implementing functions such as buttons, scroll bars, and  
wheels. The sensors need only one PCB layer, enabling ultra  
thin applications.  
The AD7147 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 (∑-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.  
The AD7147 has an SPI-compatible serial interface, and the  
AD7147-1 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 serial interface independent of VCC  
.
The AD7147 is available in a 24-lead, 4 mm × 4 mm LFCSP and  
operates from a 2.6 V to 3.6 V supply. The operating current con-  
sumption in low power mode is typically 26 μA for 13 sensors.  
High resolution sensors require minor software to run on the  
host processor.  
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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