- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄9488 > AD7147AACBZ-500RL7 (Analog Devices Inc)IC CDC 13CH SPI W/RAM 25WLCSP PDF資料下載
參數(shù)資料
| 型號： | AD7147AACBZ-500RL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 4/69頁 |
| 文件大小： | 0K |
| 描述： | IC CDC 13CH SPI W/RAM 25WLCSP |
| 產(chǎn)品變化通告： | 8mm Carrier Tape Changes 28/Feb/2012 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | CapTouch™ |
| 類型： | 電容數(shù)字轉(zhuǎn)換器 |
| 分辨率（位）： | 16 b |
| 采樣率（每秒）： | 250k |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 電壓電源： | 單電源 |
| 電源電壓： | 2.6 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 25-UFBGA，WLCSP |
| 供應(yīng)商設(shè)備封裝： | 25-WLCSP |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | AD7147AACBZ-500RL7DKR |
第1頁第2頁第3頁當(dāng)前第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁
AD7147A
Rev. B | Page 11 of 68
THEORY OF OPERATION
The AD7147A and AD7147A-1 are CDCs with on-chip environ-
mental compensation. They are intended for use in portable
systems requiring high resolution user input. The internal
circuitry consists of a 16-bit, Σ-Δ converter that can change a
capacitive input signal into a digital value. There are 13 input
pins, CIN0 to CIN12. A switch matrix routes the input signals
to the CDC. The result of each capacitance-to-digital conversion
is stored in on-chip registers. The host subsequently reads the
results over the serial interface. The AD7147A has an SPI interface,
and the AD7147A-1 has an I2C interface, ensuring that the parts
are compatible with a wide range of host processors. AD7147A
refers to both the AD7147A and AD7147A-1, unless otherwise
noted, from this point forward in this data sheet.
The AD7147A interfaces with up to 13 external capacitance
sensors. These sensors can be arranged as buttons, scroll bars,
or wheels, or as a combination of sensor types. The external
sensors consist of an electrode on a single- or multiple-layer
PCB that interfaces directly to the AD7147A.
The AD7147A can be set up to implement any set of input
sensors by programming the on-chip registers. The registers
can also be programmed to control features such as averaging,
offsets, and gains for each of the external sensors. There is an
on-chip sequencer that controls how each of the capacitance
inputs is polled.
The AD7147A has on-chip digital logic and 528 words of RAM
that are used for environmental compensation. The effects of
humidity, temperature, and other environmental factors can
affect the operation of capacitance sensors. Transparent to the
user, the AD7147A performs continuous calibration to compen-
sate for these effects, allowing the AD7147A to consistently
provide error-free results.
The AD7147A requires a companion algorithm that runs on the
host or another microcontroller to implement high resolution
sensor functions, such as scroll bars or wheels. However, no
companion algorithm is required to implement buttons. Button
sensors are implemented on chip, entirely in digital logic.
The AD7147A can be programmed to operate in either full
power mode or low power automatic wake-up mode. The
automatic wake-up mode is particularly suited for portable
devices that require low power operation to provide the user
with significant power savings and full functionality.
The AD7147A has an interrupt output, INT, to indicate when new
data has been placed into the registers. INT is used to interrupt the
host on sensor activation. The AD7147A operates from a 2.6 V to
3.6 V supply and is available in a 2.3 mm × 2.1 mm WLCSP.
CAPACITANCE SENSING THEORY
The AD7147A measures capacitance changes from single electrode
sensors. The sensor electrode on the PCB comprises one plate
of a virtual capacitor. The other plate of the capacitor is the user’s
finger, which is grounded with respect to the sensor input.
The AD7147A first outputs an excitation signal to charge the
plate of the capacitor. When the user comes close to the sensor,
the virtual capacitor is formed, with the user acting as the second
capacitor plate.
PLASTIC COVER
AD7147A
SENSOR PCB
MU
X
Σ-Δ
ADC
16-BIT
DATA
EXCITATION
SIGNAL
250kHz
07
72
7-
0
19
Figure 19. Capacitance-Sensing Method
A square wave excitation signal is applied to CINx during
the conversion, and the modulator continuously samples the
charge going through CINx. The output of the modulator is
processed via a digital filter, and the resulting digital data is
stored in the CDC_RESULT_Sx registers for each conversion
stage, at Address 0x00B to Address 0x016.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ICM7242IPAZ | IC OSC BINARY CTC 13MHZ 8-DIP |
| MS17344R24C22P | CONN PLUG 4POS STRAIGHT W/PINS |
| MC14536BDWG | IC OSC PROG TIMER 2MHZ 16SOIC |
| MS17344C24C22P | CONN PLUG 4POS STRAIGHT W/PINS |
| MS17344R24C28P | CONN PLUG 24POS STRAIGHT W/PINS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7147AACBZ-RL | 功能描述:IC CDC 13CH SPI W/RAM 25WLCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 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:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| AD7147ACPZ-1500RL7 | 功能描述:IC CAP-TO-DGTL CONV PROG 24LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:CapTouch™ 產(chǎn)品培訓(xùn)模塊:Data Converter Basics 標(biāo)準(zhǔn)包裝:1 系列:- 類型:電機(jī)控制 分辨率（位）:12 b 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，并聯(lián) 電壓電源:單電源 電源電壓:2.7 V ~ 3.6 V，4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:100-TQFP 供應(yīng)商設(shè)備封裝:100-TQFP（14x14） 包裝:剪切帶 (CT) 其它名稱:296-18373-1 |
| AD7147ACPZ-1500RL7 | 制造商:Analog Devices 功能描述:IC CDC 16BIT 111SPS LFCSP-24 |
| AD7147ACPZ-1REEL | 功能描述:IC CAP-TO-DGTL CONV PROG 24LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 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:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| AD7147ACPZ-500RL7 | 功能描述:IC CAP-TO-DGTL CONV PROG 24LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:CapTouch™ 產(chǎn)品培訓(xùn)模塊:Data Converter Basics 標(biāo)準(zhǔn)包裝:1 系列:- 類型:電機(jī)控制 分辨率（位）:12 b 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，并聯(lián) 電壓電源:單電源 電源電壓:2.7 V ~ 3.6 V，4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:100-TQFP 供應(yīng)商設(shè)備封裝:100-TQFP（14x14） 包裝:剪切帶 (CT) 其它名稱:296-18373-1 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。