- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄9737 > AD7148ACPZ-1500RL7 (Analog Devices Inc)IC CAP-TO-DGTL CONV PROG 16LFCSP PDF資料下載
參數(shù)資料
| 型號： | AD7148ACPZ-1500RL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/57頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CAP-TO-DGTL CONV PROG 16LFCSP |
| 標準包裝： | 1 |
| 類型： | 電容性 |
| 觸摸面板接口： | 2 線 |
| 輸入數(shù)/鍵： | 8 鍵 |
| 分辨率（位）： | 16 b |
| 數(shù)據(jù)接口： | I²C，串行 |
| 數(shù)據(jù)速率/采樣率 (SPS，BPS)： | 250k |
| 電壓基準： | 內(nèi)部 |
| 電源電壓： | 2.6 V ~ 3.3 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 16-LFCSP |
| 包裝： | 標準包裝 |
| 產(chǎn)品目錄頁面： | 781 (CN2011-ZH PDF) |
| 其它名稱： | AD7148ACPZ-1500RL7DKR |
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頁當前第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
AD7148
Rev. A | Page 18 of 56
RECALIBRATION
In certain situations, the proximity flag can be set for a long period: for
example, when a user hovers over a sensor for a long time. The
environmental calibration on the AD7148 is suspended 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ambient value stored on the AD7148 no longer represents the actual
ambient value. In this case, even when the user has left the sensor, the
proximity flag may still be set. This situation could occur if 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 AD7148 automatically forces an internal recalibration,
ensuring that the ambient values are recalibrated, regardless of how
long the user hovers over a sensor. The recalibration ensures
maximum sensor performance.
The AD7148 recalibrates automatically when the measured CDC
value exceeds the stored ambient value by an amount determined by
the PROXIMITY_RECAL_LVL bits (Address 0x003[7:0]) for
a set period of time, known as the recalibration timeout.
In full power mode, the recalibration timeout is controlled by
FP_PROXIMITY_RECAL; in low power mode, the timeout is
controlled by LP_PROXIMTY_RECAL.
The recalibration timeout in full power mode is the value of the
FP_PROXIMITY_RECAL multiplied by the time taken for one
conversion sequence in full power mode.
The recalibration timeout in low power mode is the value of the
LP_PROXIMITY_RECAL multiplied by the time taken for one
conversion sequence in low power mode.
PROXIMITY_RECAL and LP_PROXIMITY_RECAL register
bits (Address 0x004[15:0]) control the timeout period before a
recalibration while operating in the full power and low power modes.
These figures show a user approaching a sensor, followed by the user
leaving the sensor while the proximity detection remains active
after the user leaves the sensor. 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.
CALIBRATION ENABLED
tRECAL_TIMEOUT
16
30
70
tCONV_FP
MEASURED CDC VALUE > STORED AMBIENT
BY PROXIMITY_RECAL _LVL
RECALIBRATION TIME-OUT
PROXIMITY DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
CDC CONVERSION SEQUENCE
(INTERNAL)
RECALIBRATION COUNTER
(INTERNAL)
071
55
-0
27
NOTES
1. SEQUENCE CONVERSION TIME
tCONV_FP DETERMINED FROM TABLE 9.
2.
tCALDIS = tCONV_FP × FP_PROXIMITY_CNT × 16.
3.
tRECAL_TIMEOUT = tCONV_FP × FP_PROXIMITY_RECAL.
4.
tRECAL = 2 × tCONV_FP.
USER APPROACHES
SENSOR HERE
USER LEAVES SENSOR
AREA HERE
tCALDIS
tRECAL
CALIBRATION DISABLED
Figure 28. Full Power Mode Proximity Detection with Forced Recalibration Example with FP_PROXIMITY_CNT = 1 and FP_PROXIMITY_RECAL = 40
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MS27467P9B98SA | CONN PLUG 3POS STRAIGHT W/SCKT |
| VE-J1J-MX-F1 | CONVERTER MOD DC/DC 36V 75W |
| MS27484T10B35PB | CONN PLUG 13POS STRAIGHT W/PINS |
| SY100E416JI | IC LINE RCVR QUINT DIFF 28-PLCC |
| MS27467T15F19PD | CONN PLUG 19POS STRAIGHT W/PINS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7148ACPZ-1REEL | 功能描述:IC CAP-TO-DGTL CONV PROG 16LFCSP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 觸摸屏控制器 系列:- 標準包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數(shù)/鍵:- 分辨率（位）:- 評估套件:* 數(shù)據(jù)接口:- 數(shù)據(jù)速率/采樣率 (SPS，BPS):- 電壓基準:- 電源電壓:- 電流 - 電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR) |
| AD7150 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultra Low Power, 2 Channel, Capacitance Converter for Proximity Sensing |
| AD7150BRMZ | 功能描述:IC CAP CONV 2CH ULT LP 10MSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:20-TSSOP 包裝:管件 |
| AD7150BRMZ-REEL | 功能描述:IC CAP CONV 2CH ULT LP 10MSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:20-TSSOP 包裝:管件 |
| AD7151 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Ultra-Low Power, 1-Channel, Capacitance Converter for Proximity Sensing |
發(fā)布緊急采購，3分鐘左右您將得到回復。