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| 型號(hào)： | AD7151BRMZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CAP CONV 1CH ULT LP 10MSOP |
| 特色產(chǎn)品： | AD715x Series Capacitance-to-Digital Converters & Evaluation Board |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類型： | 電容數(shù)字轉(zhuǎn)換器 |
| 輸入類型： | 電壓 |
| 輸出類型： | 數(shù)字 |
| 接口： | 2 線串口 |
| 電流 - 電源： | 120µA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 781 (CN2011-ZH PDF) |
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AD7151
Rev. 0 | Page 16 of 28
DATA REGISTER
Address Pointer 0x01, 0x02
16 Bits, Read-Only, Default Value 0x0000
Data from the last complete capacitance-to-digital conversion
reflects the capacitance on the input. Only the 12 MSBs (most
significant bits) of the data register are used for the CDC result.
The 4 LSBs (least significant bits) are always 0, as shown in
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2
12-BIT CDC RESULT
BIT 1 BIT 0 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2
DATA HIGH
MSB
DATA LOW
LSB
BIT 1 BIT 0
0
07
086
-0
44
Figure 34. CDC Data Register
The nominal AD7151 CDC transfer function (an ideal transfer
function excluding offset and/or gain error) maps the input
capacitance between zero scale and full scale to output data
codes between 0x3000 and 0xCFF0 only (see Table 8).
Table 8. AD7151 Capacitance-to-Data Mapping
Data
Input Capacitance
0x0000
Not valid, underrange
0x3000
Zero-scale (0 pF)
0x8000
Mid-scale (+1 pF)
0xCFF0
Full-scale (+2 pF)
0xFFF0
Not valid, overrange
The input capacitance can be calculated from the output data
using the following equation:
Range
Input
Data
C
_
40944
12288
)
pF
(
×
=
where Input_Range = 4 pF, 2 pF, 1 pF, or 0.5 pF.
The following is the same equation written with hexadecimal
numbers:
Range
Input
FF
Data
C
_
0
9
x
0
3000
x
0
)
pF
(
×
=
The data register is updated after a finished conversion, with
one exception: when the serial interface read operation from the
data register is in progress, the data register is not updated and
the new capacitance conversion result is lost.
The stop condition on the serial interface is considered to be the
end of the read operation. Therefore, to prevent incorrect data
reading through the serial interface, the two bytes of the data
register should be read sequentially using the register address
pointer auto-increment feature of the serial interface.
AVERAGE REGISTER
Address Pointer 0x05, 0x06
16 Bits, Read-Only, Default Value 0x0000
This register shows the average calculated from the previous
CDC data. The 12-bit CDC result corresponds to the 12 MSBs
of the average register.
The settling time of the average can be set by programming the
ThrSettling bits in the setup register. The average register is
overwritten directly with the CDC output data, that is, the
history is forgotten if the timeout is enabled and elapses.
FIXED THRESHOLD REGISTER
Address Pointer 0x09, 0x0A
16 Bits, Read/Write, Factory Preset 0x0886
A constant threshold for the output comparator in the fixed
threshold mode can be set using this register. The 12-bit CDC
result corresponds to the 12 MSBs of the threshold register. The
fixed threshold register shares the address pointer and location
on-chip with the sensitivity and timeout registers. The fixed
threshold register is not accessible in the adaptive threshold
mode.
SENSITIVITY REGISTER
Address Pointer 0x09
8 Bits, Read/Write, Factory Preset 0x08
The sensitivity register sets the distance of the positive
threshold above the data average, and the distance of the
negative threshold below the data average, in the adaptive
threshold mode.
NEGATIVE
THRESHOLD
POSITIVE
THRESHOLD
DATA AVERAGE
OUTPUT ACTIVE
TIME
SENSITIVITY
DATA
SENSITIVITY
0
70
86
-0
24
Figure 35. Threshold Sensitivity
The sensitivity is an 8-bit value and is mapped to the lower eight
bits of the 12-bit CDC data, that is, it corresponds to the 16-bit
data register as shown in Figure 36.
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3
SENSITIVITY
BIT 2 BIT 1 BIT 0
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2
12-BIT CDC RESULT
BIT 1 BIT 0 BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2
DATA HIGH
DATA LOW
BIT 1 BIT 0
07
08
6-
0
25
Figure 36. Relation Between Sensitivity Register and CDC Data Register
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| AD7151BRMZ-REEL | 功能描述:IC CAP CONV 1CH ULT LP 10MSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| AD7152 | 制造商:AD 制造商全稱:Analog Devices 功能描述:12-Bit Capacitance-to-Digital Converter |
| AD7152BRMZ | 功能描述:IC CDC 12BIT 2/4CH 10MSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Data Converter Basics 標(biāo)準(zhǔn)包裝:1 系列:- 類型:電機(jī)控制 分辨率（位）:12 b 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，并聯(lián) 電壓電源:單電源 電源電壓:2.7 V ~ 3.6 V，4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:100-TQFP 供應(yīng)商設(shè)備封裝:100-TQFP（14x14） 包裝:剪切帶 (CT) 其它名稱:296-18373-1 |
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