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| 型號： | EVAL-AD7156EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD7156 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 傳感器類型： | 觸摸，電容式 |
| 接口： | I²C |
| 電源電壓： | 1.8 V ~ 3.6 V |
| 嵌入式： | 否 |
| 已供物品： | 板，CD |
| 已用 IC / 零件： | AD7156 |
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AD7156
Rev. 0 | Page 13 of 28
DATA AVERAGE
The adaptive threshold algorithm is based on an average calculated
from the previous CDC output data, using the following equation:
1
2
)
1
(
)
(
)
1
(
)
(
+
+
=
g
ThrSettlin
N
Average
N
Data
N
Average
N
Average
where:
Average(N) is the new average value.
Average(N 1) is the average value from the previous cycle.
Data(N) is the latest complete CDC conversion result.
ThrSettling is a parameter, programmable in the setup registers.
A more specific case of the input capacitance waveform is a step
change. The response of the average to an input capacitance step
change (more exactly, response to a step change in the CDC output
data) is an exponential settling curve, which can be 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 = 2(ThrSettling + 1)
ThrSettling is a parameter, programmable in the setup registers.
See Figure 31 and the Register Descriptions section for further
information.
INPUT CAPACITANCE
(CDC DATA) CHANGE
DATA AVERAGE RESPONSE
TIME
07
72
6-
0
38
Figure 31. Data Average Response to Data Step Change
HYSTERESIS
In adaptive threshold mode, the comparator features hysteresis.
The hysteresis is fixed to of the threshold sensitivity and can
be programmed on or off. The comparator does not have hyster-
esis in the fixed threshold mode.
OUTPUT
POSITIVE
THRESHOLD
DATA AVERAGE
OUTPUT ACTIVE
TIME
HYSTERSIS
DATA
07
72
6-
04
0
Figure 32. Threshold Hysteresis
TIMEOUT
In the case of a large, long change in the capacitive input, when
the data average adapting to a new condition takes too long, a
timeout can be set.
The timeout becomes active (counting) when the CDC data
goes outside the band of data average ± sensitivity. When the
timeout elapses (a defined number of CDC conversions is
counted), the data average (and thus the thresholds), is forced
to follow the new CDC data value immediately (see Figure 33).
The timeout can be set independently for approaching (for change
in data toward the threshold) and for receding (for change in data
Descriptions section for further information.
DATA AVERAGE
+ SENSITIVITY
LARGE CHANGE IN DATA
DATA AVERAGE
– SENSITIVITY
TIME
TIMEOUT
07
72
6-
0
41
Figure 33. Threshold Timeout After a Large Change in CDC Data
INPUT
CAPACITANCE
THRESHOLD
OUTPUT
DATA AVERAGE
OUTPUT ACTIVE
TIME
TIMEOUT APPROACHING
0772
6-
0
42
Figure 34. Approaching Timeout in Negative Threshold Mode
Shortens False Output Trigger
INPUT
CAPACITANCE
LARGE CHANGE
THRESHOLD
OUTPUT
OUTPUT ACTIVE
TIME
TIMEOUT RECEDING
0
77
26
-04
3
Figure 35. Positive Timeout in Negative Threshold Mode
Shortens Period of Missing Output Trigger
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-AD7156EBZ | 制造商:Analog Devices 功能描述:EVAL BOARD, AD7156 2CH CAPACITANCE CONVE |
| EVAL-AD7170EBZ | 功能描述:BOARD EVAL FOR AD7170 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| EVAL-AD7171EBZ | 功能描述:BOARD EVAL FOR AD7171 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| EVAL-AD7173-8SDZ | 制造商:Analog Devices 功能描述:EVAL BOARD MULTI CHANNEL - Boxed Product (Development Kits) |
| EVAL-AD7175-8SDZ | 功能描述:AD7175-8 - 24 Bit 250k Samples per Second Analog to Digital Converter (ADC) Evaluation Board 制造商:analog devices inc. 系列:- 零件狀態(tài):有效 A/D 轉(zhuǎn)換器數(shù):1 位數(shù):24 采樣率（每秒）:250k 數(shù)據(jù)接口:并聯(lián) 輸入范圍:±VREF 不同條件下的功率（典型值）:105mW @ 250kSPS 使用的 IC/零件:AD7175-8 所含物品:板，電源 標(biāo)準(zhǔn)包裝:1 |
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