參數(shù)資料
型號(hào)： EVAL-AD7143-1EBZ
廠商： Analog Devices, Inc.
英文描述： Programmable Controller for Capacitance Touch Sensors
中文描述： 可編程控制器，用于電容觸摸傳感器
文件頁(yè)數(shù)： 1/56頁(yè)
文件大?。?/td> 527K
代理商： EVAL-AD7143-1EBZ
Programmable Controller for
Capacitance Touch Sensors
AD7143
FEATURES
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 registered trademarks are the 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
2007 Analog Devices, Inc. All rights reserved.
www.analog.com
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
I
2
C-compatible serial interface
Separate VDRIVE level for serial interface
Interrupt output for host controller
16-lead, 4 mm x 4 mm LFCSP-VQ
2.6 V to 3.6 V supply voltage
Low operating current
Full power mode: less than 1 mA
Low power mode: 50 μA
APPLICATIONS
Personal music and multimedia players
Cell phones
Digital still cameras
Smart hand-held devices
Television, A/V, and remote controls
Gaming consoles
FUNCTIONAL BLOCK DIAGRAM
CSHIELD
SRC
GND
CIN0
CIN1
CIN2
CIN3
CIN4
CIN5
CIN6
CIN7
VDRIVE
VCC
16-BIT
Σ
-
Δ
CDC
S
M
15
16
1
2
3
4
5
6
9
10
7
8
250kHz
EXCITATION
SOURCE
CONTROL
AND
DATA
REGISTERS
CALIBRA-
TION
ENGINE
CALIBRA-
TION
RAM
POWER-ON
RESET
LOGIC
SDA
SCLK
INT
INTERRUPT
LOGIC
I
2
C SERIAL INTERFACE
AND CONTROL LOGIC
13
14
12
11
AD7143
0
Figure 1.
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 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 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.
The AD7143 has an I
2
C-compatible serial interface and a
separate VDRIVE pin for I
2
C serial interface operating voltages
between 1.65 V and 3.6 V.
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).
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EVAL-AD7147-1EBZ 功能描述:BOARD EVAL FOR AD7147ACPZ-1 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 傳感器 系列:CapTouch™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:-
EVAL-AD7147EBZ 功能描述:BOARD EVAL FOR AD7147ACPZ RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 傳感器 系列:CapTouch™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:-
EVAL-AD7150EBZ 功能描述:BOARD EVAL FOR AD7150 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 傳感器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:-
EVAL-AD7150EBZ 制造商:Analog Devices 功能描述:PROXIMITY SENSOR EVAL BOARD
EVAL-AD7152EBZ 功能描述:BOARD EVAL AD7152 RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 傳感器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:-
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