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參數(shù)資料
| 型號(hào)： | AD7148ACPZ-1500RL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/57頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CAP-TO-DGTL CONV PROG 16LFCSP |
| 標(biāo)準(zhǔn)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(zhǔn)： | 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(yīng)商設(shè)備封裝： | 16-LFCSP |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 781 (CN2011-ZH PDF) |
| 其它名稱： | AD7148ACPZ-1500RL7DKR |
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AD7148
Rev. A | Page 12 of 56
Low Power Mode
The time required for the AD7148 to transition from a full power
state to a reduced power state after the user stops touching the
external sensors is configurable. The PWR_DOWN_TIMEOUT
bits in the AMB_COMP_CTRL0 register (Address 0x002[13:12])
control the time delay before the AD7148 transitions to the reduced
power state after the user stops touching the sensors.
When in low power mode, the POWER_MODE bits are set
to 10 upon device initialization. If the external sensors are not
touched, the AD7148 reduces its conversion frequency, thereby
greatly reducing its power consumption. The part remains in
a reduced power state while the sensors are not touched. After a
delay defined by the LP_CONV_DELAY bits (200 ms, 400 ms,
600 ms or 800 ms), the AD7148 performs a conversion and uses
this data to update the compensation logic.
Low Latency from Touch to Response
In low power mode, the AD7148 remains in a low power state until
proximity is detected on any one of the external sensors. When
proximity is detected, the AD718 is automatically configured into
the full power mode operation, thus converting each sequence
every 36 ms. Using this method, the latency delay is minimized
because the AD7148 is operating in full power mode by the time
the user physically makes contact with a sensor.
When an external sensor is touched, the AD7148 begins a conver-
sion sequence every 25 ms to read back data from the sensors.
In low power mode, total current consumption is an average of the
current used during a conversion and the current used while the
AD7148 is waiting for the next conversion to begin. For example,
when LP_CONV_DELAY is 400 ms, the AD7148 typically uses
0.85 mA current for 25 ms and 14 μA for 400 ms during the
conversion interval. Note that these conversion timings can be
altered through the register settings. See the CDC Conversion
Sequence Time section for more information.
NO
YES
NO
TIMEOUT
0
7155-
018
USER IN
PROXIMITY
TO SENSOR?
PROXIMITY TIMER
COUNT DOWN
CONVERSION SEQUENCE
EVERY 36ms FOR
SENSOR READBACK
USER IN
PROXIMITY
TO SENSOR?
CONVERSION SEQUENCE
EVERY LP_CONV_DELAY
UPDATE COMPENSATION
LOGIC DATA PATH
AD7148 SETUP
AND INITIALIZATION
POWER_MODE = 10
Figure 19. Low Power Mode Operation
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| 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(biāo)準(zhǔn)包裝:96 系列:- 類型:- 觸摸面板接口:- 輸入數(shù)/鍵:- 分辨率（位）:- 評(píng)估套件:* 數(shù)據(jù)接口:- 數(shù)據(jù)速率/采樣率 (SPS，BPS):- 電壓基準(zhǔn):- 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(yīng)商設(shè)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(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)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(yīng)商設(shè)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(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)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(yīng)商設(shè)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 |
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