參數(shù)資料
型號(hào): AD7147AACBZ-RL
廠商: Analog Devices Inc
文件頁(yè)數(shù): 13/69頁(yè)
文件大小: 0K
描述: IC CDC 13CH SPI W/RAM 25WLCSP
產(chǎn)品變化通告: 8mm Carrier Tape Changes 28/Feb/2012
標(biāo)準(zhǔn)包裝: 10,000
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: 25-UFBGA,WLCSP
供應(yīng)商設(shè)備封裝: 25-WLCSP
包裝: 帶卷 (TR)
AD7147A
Rev. B | Page 19 of 68
Table 13. Proximity Control Registers (See Figure 33)
Bit Name
Length
(Bits)
Register Address
Description
FP_PROXIMITY_CNT
4
0x002[7:4]
Calibration disable time in full power mode.
LP_PROXIMITY_CNT
4
0x002[11:8]
Calibration disable time in low power mode.
FP_PROXIMITY_RECAL
10
0x004[9:0]
Full power mode proximity recalibration time control.
LP_PROXIMITY_RECAL
6
0x004[15:10]
Low power mode proximity recalibration time control.
PROXIMITY_RECAL_LVL
8
0x003[7:0]
Proximity recalibration level. This value, multiplied by 16, controls the
sensitivity of Comparator 2 (see Figure 33).
PROXIMITY_DETECTION_RATE
6
0x003[13:8]
Proximity detection rate. This value, multiplied by 16, controls the
sensitivity of Comparator 1 (see Figure 33).
CALIBRATION ENABLED
CALIBRATION DISABLED
PROXIMITY
DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
12
3456789 10 11 12 13 14 15 16
CDC CONVERSION
SEQUENCE
(INTERNAL)
USER LEAVES
SENSOR AREA
USER APPROACHES
SENSOR
17 18 19 20 21 22 23 24
tCONV_FP
tCALDIS
07
72
7-
02
9
Figure 29. Example of Full Power Mode Proximity Detection (FP_PROXIMITY_CNT = 1)
NOTES
1. SEQUENCE CONVERSION TIME
tCONV_LP = tCONV_FP + LP_CONV_DELAY.
2. PROXIMITY IS SET WHEN THE USER APPROACHES THE SENSOR, AT WHICH TIME THE INTERNAL CALIBRATION IS DISABLED.
3.
tCALDIS = (tCONV_LP × LP_PROXIMITY_CNT × 4).
CALIBRATION ENABLED
CALIBRATION DISABLED
PROXIMITY
DETECTION
(INTERNAL)
CALIBRATION
(INTERNAL)
tCALDIS
tCONV_LP
123456
789 10 11 12 13 14 15 16
CDC CONVERSION
SEQUENCE
(INTERNAL)
USER LEAVES
SENSOR AREA
USER APPROACHES
SENSOR
17 18 19 20 21 22 23 24
07
72
7-
0
30
Figure 30. Example of Low Power Mode Proximity Detection (LP_PROXIMITY_CNT = 4)
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