您的位置：维库电子市场网 > Datasheet > AD7142

AD7142 Datasheet

  • AD7142

  • Programmable Capacitance-to-Digital Converter with Environme...

  • 3076.70KB

  • 66页

  • AD

阅览下载 纠错 0

扫码查看芯片数据手册

上传产品规格书

PDF预览

Programmable Capacitance-to-Digital
Converter with Environmental
Compensation
AD7142
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庐-compatible serial interface (AD7142)
I
2
C庐-compatible serial interface (AD7142-1)
Separate V
DRIVE
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 渭A
FUNCTIONAL BLOCK DIAGRAM
V
REF鈥?/div>
V
REF+
29
28
TEST
27
CIN0
CIN1
CIN2
CIN3
CIN4
CIN5
CIN6
CIN7
CIN8
CIN9
CIN10
CIN11
CIN12
CIN13
30
31
32
1
2
3
POWER-ON
RESET
LOGIC
13
14
AV
CC
AGND
SWITCH
MATRIX
4
5
6
7
8
9
10
11
16-BIT
危-螖
CDC
CALIBRATION
ENGINE
17
DV
CC
DGND1
DGND2
CALIBRATION
RAM
CONTROL
AND
DATA
REGISTERS
18
19
C
SHIELD
SRC
SRC
12
15
16
250kHz
EXCITATION
SOURCE
V
DRIVE
20
SERIAL INTERFACE
AND CONTROL LOGIC
INTERRUPT
AND GPIO
LOGIC
26
GPIO
APPLICATIONS
Personal music and multimedia players
Cell phones
Digital still cameras
Smart hand-held devices
Television, A/V, and remote controls
Gaming consoles
21
22
23
24
25
SDO/
SDA
SDI/ SCLK CS/
ADD0
ADD1
INT
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 (鈭?螖) 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.
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.
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,
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 AD7142 has an SPI-compatible serial interface, and the
AD7142-1 has an I
2
C-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 脳
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 渭A in low power mode (conversion interval of 400 ms).
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
漏2006 Analog Devices, Inc. All rights reserved.
05702-001

AD7142 PDF文件相关型号

AD7142-1

AD7142相关型号PDF文件下载

  • 型号
    版本
    描述
    厂商
    下载
  • AD711
    英文版
    Precision, Low Cost, High Speed, BiFET Op Amp
    AD
    AD711
  • AD711
    英文版
    Precision, Low Cost, High Speed, BiFET Op Amp
    AD [Analog...
    AD711
  • AD712
    英文版
    Dual Precision, Low Cost, High Speed, BiFET Op Amp
    AD
    AD712
  • AD712
    英文版
    Dual Precision, Low Cost, High Speed, BiFET Op Amp
    AD [Analog...
    AD712
  • AD713
    英文版
    Quad Precision, Low Cost, High Speed, BiFET Op Amp
    AD
    AD713
  • AD713
    英文版
    Quad Precision, Low Cost, High Speed, BiFET Op Amp
    AD [Analog...
    AD713
  • AD7111
    英文版
    LC2MOS LOGDAC Logarithmic D/A Converter
    AD
    AD7111
  • AD7111
    英文版
    LC2MOS LOGDAC Logarithmic D/A Converter
    AD [Analog...
    AD7111
  • AD7112
    英文版
    LC2MOS LOGDAC Dual Logarithmic D/A Converter
    AD
    AD7112
  • AD7112
    英文版
    LC2MOS LOGDAC Dual Logarithmic D/A Converter
    AD [Analog...
    AD7112
  • AD7118
    英文版
    LOGDAC CMOS Logarithmic D/A Converter
    AD
    AD7118
  • AD7118
    英文版
    LOGDAC CMOS Logarithmic D/A Converter
    AD [Analog...
    AD7118
  • AD7142
    英文版
    Programmable Capacitance-to-Digital Converter with Environme...
    AD
    AD7142
  • AD7143
    英文版
    Programmable Controller for Capacitance Touch Sensors
    AD
    AD7143
  • AD7143
    英文版
    AD7143
  • AD7147
    英文版
    CapTouch⑩ Programmable Controller for Single-Electrode Capa...
    AD
    AD7147
  • AD7147
    英文版
    CapTouch⑩ Programmable Controller for Single-Electrode Capa...
    AD [Analog...
    AD7147
  • AD7148
    英文版
    Programmable Touch Controller for Single Electrode Capacitan...
    AD
    AD7148
  • AD7148
    英文版
    Programmable Touch Controller for Single Electrode Capacitan...
    AD [Analog...
    AD7148
  • AD7150
    英文版
    Ultra Low Power, 2 Channel, Capacitance Converter for Proxim...
    AD
    AD7150

您可能感兴趣的PDF文件资料

热门IC型号推荐

©2024 维库电子市场网（www.dzsc.com）　备案号：浙B2-20050339-1 经营许可证：浙B2-20210386版权声明
买家服务热线：0571-85317607 | 买家服务部QQ： QQ:1609526468
卖家服务热线：0571-85317607 | 卖家服务部QQ： QQ:331652727

扫码下载APP，
一键连接广大的电子世界。

在线人工客服

买家服务：
卖家服务：

0571-85317607

客服在线时间周一至周五
9:00-17:30

关注官方微信号，
第一时间获取资讯。

建议反馈
返回顶部

建议反馈

联系人：

联系方式：

按住滑块，拖拽到最右边
>>
感谢您向阿库提出的宝贵意见，您的参与是维库提升服务的动力！意见一经采纳，将有感恩红包奉上哦！

PDF纠错X

投诉电话：0571-85317607 投诉QQ：

如选匿名将无法为您反馈投诉结果，建议实名投诉！