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AD7889ARS-3

更新时间: 2024-11-16 21:07:07
品牌 Logo 应用领域
亚德诺 - ADI 光电二极管转换器
页数 文件大小 规格书
41页 780K
描述
IC 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16, SSOP-16, Analog to Digital Converter

AD7889ARS-3 数据手册

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Low Voltage Controller for Touch Screens  
AD7879/AD7889  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
V
/REF  
CC  
4-wire touch screen interface  
1.6 V to 3.6 V operation  
X– Y– X+ Y+  
Median and averaging filter to reduce noise  
Automatic conversion sequencer and timer  
User-programmable conversion parameters  
Auxiliary analog input/battery monitor (0.5 V to 5 V)  
1 optional GPIO  
X+  
X–  
REF–  
REF–  
REF+  
Y+  
Y–  
Interrupt outputs (INT, PENIRQ)  
Touch-pressure measurement  
Wake-up on touch function  
12-BIT  
SAR ADC  
RESULT  
REGISTERS  
GND  
TEMPERATURE  
SENSOR  
Shutdown mode: 6 μA maximum  
12-ball, 1.6 mm × 2 mm WLCSP  
16-lead, 4 mm × 4 mm LFCSP  
AD7879/  
AD7879-1/  
AD7889/  
CONTROL  
REGISTERS  
AD7889-1  
APPLICATIONS  
Personal digital assistants  
Smart handheld devices  
Touch screen monitors  
Point-of-sale terminals  
Medical devices  
SEQUENCER  
AND TIMER  
SERIAL PORT  
TO  
RESULT  
REGISTERS  
CS/  
DIN/ DOUT/ SCL  
ADD0 ADD1 SDA  
Cell phones  
Figure 1.  
GENERAL DESCRIPTION  
The AD7879/AD7889 are 12-bit successive approximation  
analog-to-digital converters (SAR ADCs) with a synchronous  
serial interface and low on-resistance switches for driving 4-wire  
resistive touch screens. The AD7879/AD7889 work with a very  
low power supply—a single 1.6 V to 3.6 V supply—and feature  
throughput rates of 105 kSPS. The devices include a shutdown  
mode that reduces current consumption to less than 6 μA.  
The AD7879/AD7889 have a programmable pin that can operate  
as an auxiliary input to the ADC, as a battery monitor, or as a  
GPIO. In addition, a programmable interrupt output can operate  
in three modes: as a general-purpose interrupt to signal when  
DAV  
new data is available (  
INT  
), as an interrupt to indicate when  
limits are exceeded (  
), or as a pen-down interrupt when the  
PENIRQ  
screen is touched (  
). The AD7879/AD7889 offer temp-  
erature measurement and touch-pressure measurement.  
To reduce the effects of noise from LCDs and other sources, the  
AD7879/AD7889 contain a preprocessing block. The prepro-  
cessing function consists of a median filter and an averaging  
filter. The combination of these two filters provides a more robust  
solution, discarding the spurious noise in the signal and keeping  
only the data of interest. The size of both filters is programmable.  
Other user-programmable conversion controls include variable  
acquisition time and first conversion delay; up to 16 averages  
can be taken per conversion. The AD7879/AD7889 can run in  
slave mode or standalone (master) mode, using an automatic  
conversion sequencer and timer.  
The AD7879 is available in a 12-ball, 1.6 mm × 2 mm WLCSP  
and in a 16-lead, 4 mm × 4 mm LFCSP. The AD7889 is available  
in a backside-coated version of the WLCSP. Both parts support  
an SPI interface (AD7879/AD7889) or an I2C interface  
(AD7879-1/AD7889-1).  
Rev. C  
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  
www.analog.com  
Fax: 781.461.3113 ©2008–2010 Analog Devices, Inc. All rights reserved.  
 
 
 
 

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