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AD7889ACBZ-RL 数据表(PDF) 1 Page - Analog Devices

部件名 AD7889ACBZ-RL
功能描述  Low Voltage Controller for Touch Screens
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7889ACBZ-RL 数据表(HTML) 1 Page - Analog Devices

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Low Voltage Controller for Touch Screens
Data Sheet
AD7879/AD7889
Rev. D
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
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
©2008–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
4-wire touch screen interface
1.6 V to 3.6 V operation
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
Interrupt outputs (INT, PENIRQ)
Touch-pressure measurement
Wake-up on touch function
Shutdown mode: 6 μA maximum
12-ball, 1.6 mm × 2 mm WLCSP
16-lead, 4 mm × 4 mm LFCSP
APPLICATIONS
Personal digital assistants
Smart handheld devices
Touch screen monitors
Point-of-sale terminals
Medical devices
Cell phones
FUNCTIONAL BLOCK DIAGRAM
REF+
X– Y– X+ Y+
RESULT
REGISTERS
CONTROL
REGISTERS
SEQUENCER
AND TIMER
REF–
TEMPERATURE
SENSOR
TO
RESULT
REGISTERS
AD7879/
AD7879-1
AD7889/
AD7889-1
VCC/REF
X+
X–
Y+
Y–
GND
SERIAL PORT
DIN/
ADD1
DOUT/
SDA
SCL
CS/
ADD0
12-BIT
SAR ADC
REF–
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 a
throughput rate of 105 kSPS. The devices include a shutdown
mode that reduces current consumption to less than 6 μA.
To reduce the effects of noise from LCDs and other sources, the
AD7879/AD7889 contain a preprocessing block. The
preprocessing 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/AD7889 have a programmable pin that can
operate as an auxiliary input to the ADCs, as a battery monitor,
or as a general-purpose input/output (GPIO). In addition, a
programmable interrupt output can operate in three modes: as a
general-purpose interrupt to signal when new data is available
(DAV), as an interrupt to indicate when limits are exceeded
(INT), or as a pen-down interrupt when the screen is touched
(PENIRQ). The AD7879/AD7889 offer temperature
measurement and touch pressure measurement.
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 devices support
an SPI interface (AD7879/AD7889) or an I2C interface (AD7879-1/
AD7889-1).
Note that throughout this data sheet, multifunction pins, such
as PENIRQ/INT/DAV, are referred to either by the entire pin
name or by a single function of the pin, for example, PENIRQ,
when only that function is relevant.


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