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| 型号： | AD7142ACPZ-500RL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/73页 |
| 文件大小： | 0K |
| 描述： | IC CAP-TO-DGTL CONV PROG 32LFCSP |
| 标准包装： | 1 |
| 类型： | 电容数字转换器 |
| 分辨率（位）： | 16 b |
| 采样率（每秒）： | 250k |
| 数据接口： | 串行 |
| 电压电源： | 单电源 |
| 电源电压： | 2.6 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 32-LFCSP-VQ（5x5） |
| 包装： | 标准包装 |
| 其它名称： | AD7142ACPZ-500RL7DKR |
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Programmable Controller for
Capacitance Touch Sensors
AD7142
Rev. A
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
36 ms update rate (@ maximum sequence length)
Better than 1 fF resolution
14 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
SPI-compatible serial interface (AD7142)
I2C-compatible serial interface (AD7142-1)
Separate VDRIVE level for serial interface
Interrupt output and GPIO
32-lead, 5 mm x 5 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
TEST
VREF+
VREF–
SDO/
SDA
SDI/
ADD0
SCLK
CS/
ADD1
INT
CSHIELD
SRC
VDRIVE
SW
IT
C
H
MA
T
R
IX
16-BIT
Σ-Δ
CDC
CALIBRATION
ENGINE
CONTROL
AND
DATA
REGISTERS
CALIBRATION
RAM
250kHz
EXCITATION
SOURCE
SERIAL INTERFACE
AND CONTROL LOGIC
INTERRUPT
AND GPIO
LOGIC
POWER-ON
RESET
LOGIC
AVCC
AGND
DGND1
DGND2
DVCC
GPIO
19
18
17
14
13
27
28
29
CIN0 30
CIN1 31
CIN2 32
CIN3
1
CIN4
2
CIN5
3
CIN6
4
CIN7
5
CIN8
6
CIN9
7
CIN10
8
CIN11
9
CIN12 10
CIN13 11
12
15
16
20
21
22
23
24
25
26
05702-
001
Figure 1.
GENERAL DESCRIPTION
The AD7142 and AD7142-1 are integrated capacitance-to-
digital converters (CDCs) with on-chip environmental
calibration for use in systems requiring a novel user input
method. The AD7142 and AD7142-1 can interface to external
capacitance sensors implementing functions such as capacitive
buttons, scroll bars, or wheels.
The CDC has 14 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 minor software to run on the host processor.
The AD7142 and AD7142-1 have on-chip calibration logic to
account for changes in the ambient environment. The calibration
sequence is performed automatically and at continuous intervals,
when 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 AD7142 has an SPI-compatible serial interface, and the
AD7142-1 has an I2C-compatible serial interface. Both parts
have an interrupt output, as well as a general-purpose input/
output (GPIO).
The AD7142 and AD7142-1 are available in a 32-lead, 5 mm ×
5 mm LFCSP_VQ and operate 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7142ACPZ-500RL71 | 制造商:AD 制造商全称:Analog Devices 功能描述:Programmable Controller for Capacitance Touch Sensors |
| AD7142ACPZ-REEL | 功能描述:IC CAP-TO-DGTL CONV PROG 32LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:数据采集系统（DAS） 分辨率（位）:16 b 采样率（每秒）:21.94k 数据接口:MICROWIRE?，QSPI?，串行，SPI? 电压电源:模拟和数字 电源电压:1.8 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（6x6） 包装:托盘 |
| AD7142ACPZ-REEL1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Programmable Controller for Capacitance Touch Sensors |
| AD7143 | 制造商:AD 制造商全称:Analog Devices 功能描述:Programmable Controller for Capacitance Touch Sensors |
| AD7143ACPZ | 制造商:Analog Devices 功能描述:IC CDC 16BIT SMD LFCSP-16 7143 制造商:Analog Devices 功能描述:IC, CDC, 16BIT, SMD, LFCSP-16, 7143 |
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