參數(shù)資料
型號(hào)： EVAL-AD7147-1EBZ
廠商： Analog Devices, Inc.
英文描述： CapTouch⑩ Programmable Controller for Single-Electrode Capacitance Sensors
中文描述： CapTouch⑩可編程控制器，用于單電極電容傳感器
文件頁(yè)數(shù)： 1/68頁(yè)
文件大?。?/td> 670K
代理商： EVAL-AD7147-1EBZ
CapTouch
Programmable Controller for
Single-Electrode Capacitance Sensors
AD7147
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 (CDC)
Femtofarad resolution
13 capacitance sensor inputs
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)
I
2
C-compatible serial interface (AD7147-1)
Separate V
DRIVE
level for serial interface
Interrupt output and general-purpose input/output (GPIO)
24-lead, 4 mm × 4 mm LFCSP
2.6 V to 3.3 V supply voltage
Low operating current
Full power mode: 1 mA
Low power mode: 21.5 μA
APPLICATIONS
Cell phones
Personal music and multimedia players
Smart handheld devices
Television, A/V, and remote controls
Gaming consoles
Digital still cameras
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.
High resolution sensors require minor software to run on the
host processor.
FUNCTIONAL BLOCK DIAGRAM
AC
SHIELD
V
CC
GND
8
11
10
CALIBRATION
ENGINE
SERIAL INTERFACE
AND CONTROL LOGIC
CALIBRATION
RAM
POWER-ON
RESET LOGIC
INTERRUPT
AND GPIO
LOGIC
EXCITATION
SOURCE
BIAS
9
CONTROL
AND DATA
REGISTERS
1Σ
Δ
C-
S
M
19
CIN0
20
CIN1
21
CIN2
22
CIN3
23
CIN4
24
CIN5
1
CIN6
2
CIN7
3
CIN8
4
CIN9
5
CIN10
6
CIN11
7
CIN12
V
DRIVE
GPIO
18
12
13
14
15
16
17
SDO/
SDA
SDI/
ADD0
SCLK CS/
ADD1
INT
AD7147
0
Figure 1. AD7147 Block Diagram
The AD7147 is designed for single-electrode capacitance
sensors (grounded sensors). There is an active shield output to
minimize noise pickup in the sensor.
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.
The AD7147 has an SPI-compatible serial interface, and the
AD7147-1 has an I
2
C-compatible serial interface. Both parts have
an interrupt output, as well as a GPIO. There is a V
DRIVE
pin to set
the voltage level for the serial interface independent of V
CC
.
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.
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參數(shù)描述
EVAL-AD7147EBZ 功能描述:BOARD EVAL FOR AD7147ACPZ RoHS:是 類別:編程器，開發(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-AD7156EBZ 功能描述:BOARD EVAL FOR AD7156 RoHS:是 類別:編程器，開發(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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