參數(shù)資料
型號(hào)： AD7148ACPZ-1REEL
廠商： Analog Devices Inc
文件頁數(shù)： 14/57頁
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 20 of 56
071
55
-0
29
PROXIMITY SENSITIVITY
The fast filter in Figure 30 is used to detect when someone is
close to the sensor (proximity). Two conditions set the internal
proximity detection signal, using Comparator 1 and Comparator 2.
Comparator 1 detects when a user is approaching a sensor. The
PROXIMITY_DETECTION_RATE bits (Address0x003[13:8])
controls the sensitivity of Comparator 1. 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. Comparator 2 detects when
a user hovers over a sensor or approaches a sensor very slowly.
The PROXIMITY_RECAL_LVL bits (Address 0x003[7:0]) 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.
FF_SKIP_CNT
The proximity detection fast FIFO is used by the on-chip logic
to determine if proximity is detected . The fast FIFO expects to
receive samples from the converter at a set rate. FF_SKIP_CNT
(Register 0x002[3:0]) is the fast filter skip control, which used to
normalize the frequency of the samples going into the FIFO,
regardless of how many conversion stages are in a sequence. This
value determines which CDC samples are not used (skipped) in
the proximity detection fast FIFO.
Determining the FF_SKIP_CNT value is required only once during
the initial setup of the capacitance sensor interface. Table 13 shows
how FF_SKIP_CNT controls the update rate to the fast FIFO.
Recommended value for this setting, when using all eight
conversion stages on the AD7148, is
FF_SKIP_CNT = 0000 = no samples skipped.
8
7
N
= 0
PROXIMITY_DETECTION_RATE
REGISTER 0x003
PROXIMITY_RECAL_LVL
REGISTER 0x003
BANK 3 REGISTERS
P
R
OX
IM
ITY
2
SLOW_FILTER_UPDATE_LVL
REGISTER 0x003
BANK 3 REGISTERS
SW1
16
NOTES
1. SLOW_FILTER_EN IS SET AND SW1 IS CLOSED WHEN |STAGEx_SF_WORD0–STAGEx_SF_WORD 1| EXCEEDS THE VALUE PROGRAMMED IN THE SLOW_FILTER_UPDATE_LVL BITS
PROVIDING PROXIMITY IS NOT SET.
2. PROXIMITY 1 IS SET WHEN |STAGEx_FF_WORD0– STAGEx_FF_WORD3| EXCEEDS THE VALUE PROGRAMMED IN THE PROXIMITY_DETECTION_RATE BITS.
3. PROXIMITY 2 IS SET WHEN |AVERAGE–AMBIENT| EXCEEDS THE VALUE PROGRAMMED IN THE PROXIMITY_RECAL_LVL BITS.
4. DESCRIPTION OF COMPARATOR FUNCTIONS:
COMPARATOR 1: USED TO DETECT WHEN A USER IS APPROACHING OR LEAVING A SENSOR.
COMPARATOR 2: USED TO DETECT WHEN A USER IS HOVERING OVER A SENSOR OR APPROACHING A SENSOR VERY SLOWLY.
FP_PROXIMITY_RECAL
REGISTER 0x004
LP_PROXIMITY_RECAL
REGISTER 0x004
PROXIMITY
AMBIENT VALUE
STAGEx_SF_WORDx
CDC
O
UT
P
UT
CO
DE
TIME
SENSOR
CONTACT
STAGEx_SF_AMBIENT
BANK 3 REGISTERS
STAGEx_FF_AVG
BANK 3 REGISTERS
FP_PROXIMITY_CNT
REGISTER 0x002
LP_PROXIMITY_CNT
REGISTER 0x002
PROXIMITY 1
PROXIMITY TIMING
CONTROL LOGIC
WORD(N)
Σ
STAGEx_SF_WORD7
STAGEx_SF_WORD6
STAGEx_SF_WORD5
STAGEx_SF_WORD4
STAGEx_SF_WORD3
STAGEx_SF_WORD2
STAGEx_SF_WORD1
STAGEx_SF_WORD0
STAGEx_FF_WORDx
ALSO USED TO DETECT IF THE SENSOR AMBIENT LEVEL HAS CHANGED AS A RESULT OF USER INTERACTION.
FOR EXAMPLE, HUMIDITY OR DIRT LEFT BEHIND ON SENSOR.
COMPARATOR 3: USED TO ENABLE THE SLOW FILTER UPDATE RATE. THE SLOW FILTER IS UPDATED WHENSLOW_FILTER_EN IS SET AND PROXIMITY IS NOT SET.
CDC
STAGEx_FF_WORD0
STAGEx_FF_WORD1
STAGEx_FF_WORD2
STAGEx_FF_WORD3
STAGEx_FF_WORD4
STAGEx_FF_WORD5
STAGEx_FF_WORD6
STAGEx_FF_WORD7
WORD0 – WORD3
AVERAGE – AMBIENT
PROXIMITY
COMPARATOR 1
COMPARATOR 2
COMPARATOR 3
SLOW_FILTER_EN
WORD0 – CDC VALUE
Figure 30. Proximity Detection Logic
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