參數(shù)資料
型號(hào)： AD7148ACPZ-1REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 11/57頁(yè)
文件大?。?/td> 0K
描述： IC CAP-TO-DGTL CONV PROG 16LFCSP
標(biāo)準(zhǔn)包裝： 5,000
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： 帶卷 (TR)
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ambient value stored on the AD7148 no longer represents the actual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.
Figure 28 and Figure 29 show examples of how the FP_
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
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