參數(shù)資料
型號(hào)： AD7147WPACPZ-500R7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 7/73頁(yè)
文件大?。?/td> 0K
描述： IC CAP-TO-DGTL CONV PROG 24LFCSP
標(biāo)準(zhǔn)包裝： 500
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)
AD7147
Data Sheet
Rev. D | Page 14 of 72
Full Power Mode
In full power mode, all sections of the AD7147 remain fully
powered and converting at all times. While a sensor is being
touched, the AD7147 processes the sensor data. If no sensor is
touched, the AD7147 measures the ambient capacitance level
and uses this data for the on-chip compensation routines. In full
power mode, the AD7147 converts at a constant rate. See the
CDC Conversion Sequence Time section for more information.
Low Power Mode
When AD7147 is in low power mode, the POWER_MODE bits
are set to 10 upon device initialization. If the external sensors
are not touched, the AD7147 reduces its conversion frequency,
thereby greatly reducing its power consumption. The part remains
in a reduced power state while the sensors are not touched. The
AD7147 performs a conversion after a delay defined by the
LP_CONV_DELAY bits, and it uses this data to update the
compensation logic and check if the sensors are active. The
LP_CONV_DELAY bits set the delay between conversions to
200 ms, 400 ms, 600 ms, or 800 ms.
In low power mode, the total current consumption of the AD7147
is an average of the current used during a conversion and the
current used while the AD7147 is waiting for the next conversion
to begin. For example, when LP_CONV_DELAY is 400 ms, the
AD7147 typically uses 0.85 mA of current for 36 ms and 14 μA
of current 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.)
The time for the AD7147 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 Ambient Compensation Control 0 (AMB_COMP_CTRL0)
Register at Address 0x002) control the time delay before the
AD7147 transitions to the reduced power state after the user
stops touching the sensors.
Latency from Touch to Response
In low power mode, the AD7147 remains in a low power state
until any one of the external sensors are touched. When a
sensor is touched, the AD7147 begins a conversion sequence
every 36 ms to read back data from the sensors. This means that
the latency between the user touching the sensor, and the AD7147
responding, is a maximum of LP_CONV_DELAY ms.
Low Latency from Touch to Response
In low power mode, the AD7147P model remains in a low power
state until proximity is detected on any one of the external sensors.
When proximity is detected, the AD714P begins a conversion
sequence every 36 ms, or 18 ms, or 9 ms to read back data from the
sensors. The latency between first touch and the AD7147P
responding is much reduced, compared to the AD7147, because
the part is already in a full power state by the time the user has
touched the sensor.
NO
YES
NO
TIMEOUT
AD7147P SETUP
AND INITIALIZATION
POWER_MODE = 10
USER IN
PROXIMITY
TO SENSOR?
CONVERSION SEQUENCE
EVERY LP_CONV_DELAY
UPDATE COMPENSATION
LOGIC DATA PATH
PROXIMITY TIMER
COUNTDOWN
CONVERSION SEQUENCE
EVERY 9/18/36ms FOR
SENSOR READBACK
USER IN
PROXIMITY
TO SENSOR?
06
66
3-
06
6
NO
YES
NO
TIMEOUT
AD7147 SETUP
AND INITIALIZATION
POWER_MODE = 10
ANY
SENSOR
TOUCHED?
CONVERSION SEQUENCE
EVERY LP_CONV_DELAY
UPDATE COMPENSATION
LOGIC DATA PATH
PROXIMITY TIMER
COUNTDOWN
CONVERSION SEQUENCE
EVERY 9/18/36ms FOR
SENSOR READBACK
ANY SENSOR
TOUCHED?
06
66
3-
0
20
Figure 23. Low Power Mode Operation, AD7147P
Figure 22. Low Power Mode Operation, AD7147
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