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參數資料
| 型號： | AD7143ACPZ-1REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 1/57頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CONV CAP-TO-DGTL PROG 16LFCSP |
| 標準包裝： | 5,000 |
| 類型： | 電容數字轉換器 |
| 輸入類型： | 邏輯 |
| 輸出類型： | 邏輯 |
| 接口： | I²C |
| 電流 - 電源： | 1mA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 16-LFCSP-VQ |
| 包裝： | 帶卷 (TR) |
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Programmable Controller for
Capacitance Touch Sensors
AD7143
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
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
www.analog.com
Fax: 781.461.3113
2007 Analog Devices, Inc. All rights reserved.
FEATURES
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
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
SW
IT
C
H
MA
T
R
IX
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
I2C SERIAL INTERFACE
AND CONTROL LOGIC
13
14
12
11
AD7143
06
47
2-
0
01
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 I2C-compatible serial interface and a
separate VDRIVE pin for I2C 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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