- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄9489 > AD7147ACPZ-REEL (Analog Devices Inc)IC CAP-TO-DGTL CONV PROG 24LFCSP PDF資料下載
參數(shù)資料
| 型號： | AD7147ACPZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/73頁 |
| 文件大小： | 0K |
| 描述： | IC CAP-TO-DGTL CONV PROG 24LFCSP |
| 標(biāo)準(zhǔn)包裝： | 5,000 |
| 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： | 24-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 24-LFCSP-VQ（4x4） |
| 包裝： | 帶卷 (TR) |
| 配用： | EVAL-AD7147EBZ-ND - BOARD EVAL FOR AD7147ACPZ EVAL-AD7147-1EBZ-ND - BOARD EVAL FOR AD7147ACPZ-1 |
第1頁第2頁第3頁第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頁當(dāng)前第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頁第70頁第71頁第72頁第73頁
Data Sheet
AD7147
Rev. D | Page 19 of 72
NONCONTACT PROXIMITY DETECTION
The AD7147 internal signal processing continuously monitors
all capacitance sensors for noncontact proximity detection. This
feature provides the ability to detect when a user is approaching
a sensor, at which time all internal calibration is immediately
disabled while the AD7147 is automatically configured to detect
a valid contact.
The proximity control register bits are described in Table 12. The
FP_PROXIMITY_CNT and LP_PROXIMITY_CNT register
bits control the length of the calibration disable period after
the user stops touching the sensor and is not in close proximity
to the sensor during full or low power mode. The calibration is
disabled during this period and then enabled again. Figure 30
and Figure 31 show examples of how these registers are used to set
the calibration disable periods for the full and low power modes.
The calibration disable period in full power mode is the value
of the FP_PROXIMITY_CNT multiplied by 16 multiplied by
the time for one conversion sequence in full power mode. The
calibration disable period in low power mode is the value of the
LP_PROXIMITY_CNT multiplied by 4 multiplied by the time
for one conversion sequence in low power mode.
RECALIBRATION
In certain situations (for example, when a user hovers over a
sensor for a long time), the proximity flag can be set for a long
period. The environmental calibration on the AD7147 is sus-
pended while proximity is detected, but changes may occur
to the ambient capacitance level during the proximity event.
This means that the ambient value stored on the AD7147 no
longer represents the actual ambient value. In this case, even
when the user is not in close proximity to the sensor, the prox-
imity flag may still be set. This situation can occur if the user
interaction creates some moisture on the sensor, causing the
new sensor ambient value to be different from the expected
value. In this situation, the AD7147 automatically forces a
recalibration internally. This ensures that the ambient values
are recalibrated, regardless of how long the user hovers over
the sensor. A recalibration ensures maximum AD7147 sensor
performance.
The AD7147 recalibrates automatically when the measured CDC
value exceeds the stored ambient value by an amount determined
by the PROXIMITY_RECAL_LVL bits for a set period of time
known as the recalibration timeout. In full power mode, the recali-
bration timeout is controlled by FP_PROXIMITY_RECAL; in
low power mode, by LP_PROXMTY_RECAL.
The recalibration timeout in full power mode is the value of
the FP_PROXIMITY_RECAL multiplied by the time for one
conversion sequence in full power mode. The recalibration time-
out in low power mode is the value of the LP_PROXIMITY_
RECAL multiplied by the time for one conversion sequence in
low power mode.
FP_PROXIMITY_RECAL and LP_PROXIMITY_RECAL
register bits control the timeout period before a recalibration
while operating in the full and low power modes. In these
examples, a user approaches a sensor and then leaves, but the
proximity detection remains active. The measured CDC value
exceeds the stored ambient value by the amount set in the
PROXIMITY_RECAL_LVL bits for the entire timeout period.
The sensor is automatically recalibrated at the end of the
timeout period.
PROXIMITY SENSITIVITY
The fast filter in Figure 34 is used to detect when someone is close
to the sensor (proximity). Two conditions, detected by Compa-
rator 1 and Comparator 2, set the internal proximity detection
signal: Comparator 1 detects when a user is approaching or
leaving a sensor, and Comparator 2 detects when a user hovers
over a sensor or approaches a sensor very slowly.
The sensitivity of Comparator 1 is controlled by the
PROXIMITY_DETECTION_RATE bits. For example, if
PROXIMITY_DETECTION_RATE is set to 4, the Proximity 1
signal is set when the absolute difference between WORD1 and
WORD3 exceeds (4 × 16) LSB codes.
The PROXIMITY_RECAL_LVL bits (Address 0x003) control
the sensitivity of Comparator 2. For example, if PROXIMITY_
RECAL_LVL is set to 75, the Proximity 2 signal is set when the
absolute difference between the fast filter average value and the
ambient value exceeds (75 × 16) LSB codes.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MS3100A28-10S | CONN RCPT 7POS WALL MNT W/SCKT |
| V375A8M300BF | CONVERTER MOD DC/DC 8V 300W |
| MS17344R22C14S | CONN PLUG 19POS STRAIGHT W/SCKT |
| V375A8M300BL3 | CONVERTER MOD DC/DC 8V 300W |
| D38999/26WG16PA | CONN PLUG 16POS STRAIGHT W/PINS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7147EBZ | 制造商:Analog Devices 功能描述:CAPACITANCE TO DIGITAL CONVERTER - Bulk |
| AD7147P-1WAFER | 功能描述:IC CAP-TO-DGTL CONV PROG WAFER 制造商:analog devices inc. 系列:* 零件狀態(tài):上次購買時間 標(biāo)準(zhǔn)包裝:1 |
| AD7147PACPZ-1500R7 | 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 |
| AD7147PACPZ-1RL | 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 |
| AD7147PACPZ-500R7 | 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)。