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| 型號： | EVAL-AD7150EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/28頁 |
| 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 |
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AD7150
Rev. 0 | Page 10 of 28
ARCHITECTURE AND MAIN FEATURES
DIGITAL
FILTER
POWER-DOWN
TIMER
CLOCK
GENERATOR
SERIAL
INTERFACE
POWER SUPPLY
MONITOR
CIN1
CX1
CX2
EXC1
Σ-Δ CDC
CIN2
EXC2
MUX
EXCITATION
CAPDAC
THRESHOLD
SCL
VDD
GND
AD7150
SDA
PROGRAMMING
INTERFACE
DIGITAL
OUTPUTS
OUT1
OUT2
3.3V
0
65
17
-03
0
Figure 22. AD7150 Block Diagram
The AD7150 core is a high performance capacitance-to-digital
converter (CDC) that allows the part to be interfaced directly to
a capacitive sensor.
The comparators compare the CDC result with thresholds, either
fixed or dynamically adjusted by the on-chip adaptive threshold
algorithm engine. Thus, the outputs indicate a defined change in
the input sensor capacitance.
The AD7150 also integrates an excitation source and CAPDAC
for the capacitive inputs, an input multiplexer, a complete clock
generator, a power-down timer, a power supply monitor, control
logic, and an I2C-compatible serial interface for configuring the
part and accessing the internal CDC data and status, if required
in the system (see Figure 22).
CAPACITANCE-TO-DIGITAL CONVERTER
Figure 23 shows the CDC simplified functional diagram. The
converter consists of a second-order sigma delta (Σ-Δ), charge
balancing modulator and a third-order digital filter. The
measured capacitance CX is connected between an excitation
source and the Σ-Δ modulator input. The excitation signal is
applied on the CX during the conversion, and the modulator
continuously samples the charge going through the CX. The
digital filter processes the modulator output, which is a stream
of 0s and 1s containing the information in 0 and 1 density. The data
is processed by the adaptive threshold engine and output compara-
tors; the data can be also read through the serial interface.
The AD7150 is designed for floating capacitive sensors.
Therefore, both CX plates have to be isolated from ground or
any other fixed potential node in the system.
The AD7150 features slew rate limiting on the excitation voltage
output, which decreases the energy of higher harmonics on the
excitation signal and dramatically improves the system
electromagnetic compatibility (EMC).
DIGITAL
FILTER
0x000 TO 0xFFF
DATA
CLOCK
GENERATOR
CAPACITANCE TO DIGITAL CONVERTER
(CDC)
CIN
CX
0pF TO 4pF
EXC
EXCITATION
Σ-Δ
MODULATOR
06
51
7-
03
1
Figure 23. CDC Simplified Block Diagram
CAPDAC
The AD7150 CDC core maximum full-scale input range is 4 pF.
However, the part can accept a higher capacitance on the input,
and the offset (nonchanging component) capacitance of up to 10
pF can be balanced by a programmable on-chip CAPDAC.
0x000 TO 0xFFF
DATA
CIN
EXC
CAPDAC
10pF
0pF TO 4pF
CX
10pF TO 14pF
0
65
17
-0
32
Figure 24. Using CAPDAC
The CAPDAC can be understood as a negative capacitance
connected internally to the CIN pin. The CAPDAC has a 6-bit
resolution and a monotonic transfer function. Figure 24 shows
how to use the CAPDAC to shift the CDC 4 pF input range to
measure capacitance between 10 pF and 14 pF.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EVAL-AD7150EBZ | 制造商:Analog Devices 功能描述:PROXIMITY SENSOR EVAL BOARD |
| EVAL-AD7152EBZ | 功能描述:BOARD EVAL AD7152 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 傳感器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- |
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