參數資料
型號： AS8501-ASOU
廠商： ams
文件頁數： 5/41頁
文件大?。?/td> 0K
描述： IC DATA ACQ 16-SOIC
特色產品： AS8501 High Precision Data Acquisition Ics
標準包裝： 46
類型： 數據采集系統(tǒng)（DAS）
輸入類型： 模擬，數字
輸出類型： 模擬，數字
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）
供應商設備封裝： 16-SOIC
包裝： 管件
產品目錄頁面： 803 (CN2011-ZH PDF)
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
20000
25000
30000
35000
-50
-25
0
25
50
75
100
125
150
175
Temperature in deg C
In
ter
n
al
tem
p
er
ature
in
d
igi
ts
-100
-75
-50
-25
0
25
50
75
100
in
ea
ri
ty
de
vi
at
ion
in
di
gi
ts
output signal
linearity deviation
cubic fit
ams
AG
Technical
content
still
valid
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