參數(shù)資料
型號(hào)： EVAL-AD7150EBZ
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 10/28頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL FOR AD7150
特色產(chǎn)品： AD715x Series Capacitance-to-Digital Converters & Evaluation Board
標(biāo)準(zhǔn)包裝： 1
傳感器類(lèi)型： 觸摸，電容式
接口： I²C
電源電壓： 2.7 V ~ 3.6 V
嵌入式： 否
已供物品： 板，電池
已用 IC / 零件： AD7150
產(chǎn)品目錄頁(yè)面： 781 (CN2011-ZH PDF)
相關(guān)產(chǎn)品： AD7150BRMZ-REEL-ND - IC CAP CONV 2CH ULT LP 10MSOP
AD7150BRMZ-ND - IC CAP CONV 2CH ULT LP 10MSOP
AD7150
Rev. 0 | Page 18 of 28
SETUP REGISTERS
Ch1 Address Pointer 0x0B
Ch2 Address Pointer 0x0E
8 Bits, Read/Write, Factory Preset 0x0B
Table 10. Setup Registers Bit Map
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mnemonic
RngH
RngL
–
Hyst
ThrSettling (4-Bit Value)
Default
0
0x0B
Table 11. Setup Registers Bit Descriptions
Bit
Mnemonic
Description
Range bits set the CDC input range and determine the step for the AutoDAC function.
RngH
RngL
Capacitive Input Range (pF)
AutoDAC Step (CAPDAC LSB)
0
2
4
0
1
0.5
1
0
1
2
7
6
RngH
RngL
1
4
8
5
–
This bit should be 0 for the specified operation.
4
Hyst
Hyst = 1 disables hysteresis in adaptive threshold mode. This bit has no effect in fixed threshold mode;
hysteresis is always disabled in the fixed threshold mode.
3
2
1
0
ThrSettling
Determines the settling time constant of the data average and thus the settling time of the adaptive thresholds.
The response of the average to an input capacitance step change (that is, response to the change in the CDC
output data) is an exponential settling curve characterized by the following equation:
)
1
(
)
0
(
)
(
/ TimeConst
N
e
Change
Average
N
Average
+
=
where:
Average(N) is the value of average N complete CDC conversion cycles after a step change on the input.
Average(0) is the value before the step change.
TimeConst can be selected in the range between 2 and 65,536 conversion cycle multiples, in steps of power of
2, by programming the ThrSettling bits.
)
1
(
2
+
=
g
ThrSettlin
TimeConst
INPUT CAPACITANCE
(CDC DATA) CHANGE
DATA AVERAGE RESPONSE
TIME
06
51
7-
0
4
9
Figure 41. Data Average Response to Data Step Change
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