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| 型號： | AS8501-ASOT |
| 廠商： | ams |
| 文件頁數(shù)： | 5/41頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CURRENT MEASURE SOLAR 16-SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,500 |
| 類型： | 數(shù)據(jù)采集系統(tǒng)（DAS） |
| 輸入類型： | 模擬，數(shù)字 |
| 輸出類型： | 模擬，數(shù)字 |
| 接口： | 串行 |
| 電流 - 電源： | 5mA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC |
| 包裝： | 帶卷 (TR) |
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AS8501 - Data Sheet
austriamicrosystems
Revision 1.1, 04-April-06
www.austriamicrosystems.com
Page 12 of 40
7.2.3
Internal temperature sensor
The ASSP contains a high sensitive precision temperature sensor which can be used at any time. The sensor supplies a very linear voltage signal with
an offset at 23 degC, which is calibrated and stored in the ZZR-register. The voltage can be measured using the internal circuitry with gain 6, with free
selection of all other parameters defining the sampling rate.
The slope of the curve is approx. 75 digits per degC.
The calculation of the temperature has to be done in the external C acc. to the following simple formula:
Tint=( Uint(T)-Uint(23) ) / 75 + 23°C
Uint(T) is the measured result and Uint(23) is the reference value at 23°C, which is stored as an 11 bit-word in the ZZR-register.
Bits 15, 14 ,13 and 12 will always be the same at room temperature (0101 bin or 20480 dec), therefore it makes no sense to store them for each single
part. In addition we dont need the high resolution of one digit, which means 1/71.3 = 14 milli Kelvin. Therefore we cut the last bit and achieve a word of
11 bit length, which finally is stored in the ZZR-register as shown in the stored ZZR-register mapping‘ given in 8.6.2
Example:
value stored in the ZZR-register:
1060 dez or 10000100100 bin
Uint(23) = 0101 10000100100
0
= 22600 dec
Add register content Add
If your measured value is : Uint(T) = 23767 dec
Ti[°C]= ((23767-22600) / (75 digits / °C)) + 23 °C
= 15.6 °C + 23 °C = 38.6 °C
7.3
Digital part
In the digital part the result of the AD-converter is processed, i.e. calibration, active offset cancellation and filtering is done. In addition the
communication via the serial SDI interface is handled and all circuit functions (like voltage and current path settings, chopping, dechopping) are
controlled.
Whenever the power supply line returns from below 2.0 V to above 3.5 V a power-up circuitry is activated which loads the internal calibration registers
from the Zener-Zap memory into the working register and starts the chip in a special default mode.
7.3.1
Sampling rate
the sampling rate (SR) is defined by the setting of parameters in register CRA or CRB. The oversampling frequency (OSF), the oversampling ratio
(OSR), the chopping ratio (MM) and the averaging number (AV). The sampling rate can be calculated acc. to the following formula:
SR= OSF/(OSR*MM*AV)
Figure 7: Measurement of internal temperature sensor over oil bath temperature
15000
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Temperature in deg C
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linearity deviation
cubic fit
ams
AG
Technical
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valid
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AS8501-ASOU | 功能描述:IC DATA ACQ 16-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 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 |
| AS8501T&R | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:High precision voltage and current measurement sensor interface |
| AS8501TR | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:High precision voltage and current measurement sensor interface |
| AS8501TUB | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:High precision voltage and current measurement sensor interface |
| AS85049-32-1 | 制造商:GLENAIR 制造商全稱:Glenair, Inc. 功能描述:90° Adapter, Non-Environmental, RFI |
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