參數(shù)資料
型號(hào)： AD7143ACPZ-1REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 15/57頁(yè)
文件大?。?/td> 0K
描述： IC CONV CAP-TO-DGTL PROG 16LFCSP
標(biāo)準(zhǔn)包裝： 5,000
類型： 電容數(shù)字轉(zhuǎn)換器
輸入類型： 邏輯
輸出類型： 邏輯
接口： I²C
電流 - 電源： 1mA
安裝類型： 表面貼裝
封裝/外殼： 16-VQFN 裸露焊盤(pán)，CSP
供應(yīng)商設(shè)備封裝： 16-LFCSP-VQ
包裝： 帶卷 (TR)
AD7143
Rev. 0 | Page 21 of 56
NOTES
1. SLOW FILTER EN IS SET AND SW1 IS CLOSED WHEN |STAGE_SF_WORD 0 TO STAGE_SF_WORD 1| EXCEEDS THE VALUE PROGRAMMED IN THE
SLOW_FILTER_UPDATE_LVL REGISTER PROVIDING PROXIMITY IS NOT SET.
2. PROXIMITY 1 IS SET WHEN |STAGE_FF_WORD 0 TO STAGE_FF_WORD 3| EXCEEDS THE VALUE PROGRAMMED IN THE
PROXIMITY_DETECTION_RATE REGISTER.
3. PROXIMITY 2 IS SET WHEN |AVERAGE–AMBIENT| EXCEEDS THE VALUE PROGRAMMED IN THE PROXIMITY_RECAL_LVL REGISTER.
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.
ALSO USED TO DETECT IF THE SENSOR AMBIENT LEVEL HAS CHANGED AS A RESULT OF THE 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 WHEN SLOW FILTER EN IS SET AND
PROXIMITY
IS NOT SET.
BANK 3 REGISTERS
SW1
PROXIMITY
SLOW_FILTER_EN
STAGE_SF_WORD0
STAGE_SF_WORD1
STAGE_SF_WORD2
STAGE_SF_WORD3
STAGE_SF_WORD4
STAGE_SF_WORD5
STAGE_SF_WORD6
STAGE_SF_WORD7
STAGE_FF_WORD0
STAGE_FF_WORD1
STAGE_FF_WORD2
STAGE_FF_WORD3
STAGE_FF_WORD4
STAGE_FF_WORD5
STAGE_FF_WORD6
STAGE_FF_WORD7
8
7
ΣWORD(N)
N
= 0
COMPARATOR 3
WORD0 TO WORD1
SLOW_FILTER_UPDATE_LVL
REGISTER 0x003
STAGE_SF_AMBIENT
BANK 3 REGISTERS
STAGE_FF_AVG
BANK 3 REGISTERS
16
CDC
COMPARATOR 1
|WORD0 TO WORD3|
PROXIMITY_DETECTION_RATE
REGISTER 0x003
COMPARATOR 2
|AVERAGE–AMBIENT|
P
R
OX
IM
IT
Y
2
PROXIMITY_RECAL_LVL
REGISTER 0x003
PROXIMITY 1
PROXIMITY
LP_PROXIMITY_CNT
REGISTER 0x002
FP_PROXIMITY_CNT
REGISTER 0x002
LP_PROXIMITY_RECAL
REGISTER 0x004
FP_PROXIMITY_RECAL
REGISTER 0x004
PROXIMITY TIMING
CONTROL LOGIC
CDC
O
UT
P
UT
CO
DE
TIME
AMBIENT
VALUE
STAGE_SF_WORDx
STAGE_FF_WORDx
SENSOR
CONTACT
0
64
72
-0
29
Figure 31. AD7143 Proximity Detection and Environmental Calibration
BANK 3 REGISTERS
STAGE_MAX_WORD0
STAGE_MAX_WORD1
STAGE_MAX_WORD2
STAGE_MAX_WORD3
STAGE_MIN_WORD0
STAGE_MIN_WORD1
STAGE_MIN_WORD2
STAGE_MIN_WORD3
STAGE_MAX_AVG
BANK 3 REGISTERS
STAGE_MAX_TEMP
BANK 3 REGISTERS
STAGE_HIGH_THRESHOLD
BANK 3 REGISTERS
STAGE_MIN_AVG
BANK 3 REGISTERS
STAGE_MIN_AVG
BANK 3 REGISTERS
STAGE_LOW_THRESHOLD
BANK 3 REGISTERS
MAX LEVEL
DETECTION
LOGIC
MIN LEVEL
DETECTION
LOGIC
16
Σ-Δ
16-BIT
CDC
06
47
2-
0
48
Figure 32. AD7143 Maximum and Minimum Level Detection Logic
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