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參數(shù)資料
| 型號： | AS8501-ASOU |
| 廠商： | ams |
| 文件頁數(shù)： | 4/41頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DATA ACQ 16-SOIC |
| 特色產(chǎn)品： | AS8501 High Precision Data Acquisition Ics |
| 標準包裝： | 46 |
| 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） |
| 供應商設備封裝： | 16-SOIC |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 803 (CN2011-ZH PDF) |
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AS8501 - Data Sheet
austriamicrosystems
Revision 1.1, 04-April-06
www.austriamicrosystems.com
Page 11 of 40
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s e tting of s ubre gis te r T R IM B T C of TR R
tem
p
erat
u
re
co
effi
ci
ent
in
ppm
/K
ch ang e 12 .7 p p m /K
p er step
The TC trimming also opens the unique possibility to change the TC-value within the time of reprogramming of the TRR-register (i.e. within sec) to
allow the compensation of
different TC-values of the external circuitry for different channels.
In addition it can be used for very fast autocalibration of the total TC of a given channel. An external reference voltage is applied to the channel to be
checked. Then all numbers from 0 to 31 are written into subregister TRIMBTC and a reading is done for the input voltage and the internal temperature
as well. The same is repeated at any temperature above RT. From these data the TRIMBTC setting for a minimum drift can be easily calculated.
7.2.2
Current sources
The AS8501 contains several current sources which can be used for checking all input lines for wire brake, to control external circuitry or to activate
external sensors.
Main current source
The main current source can be digitally controlled via the content of the CRG register in 31 steps of 8 A in the range of 0 to 248 A. Its absolute
value can be calibrated by writing in the subregister TRIMC of TRR.
The current source can be switched to the inputs VBAT, ETR or ETS to activate external sensors like RTDs, NTCs or resistance briges and strain
gages. It can also be used to detect a wire breake of external connected sensors. Performing a measurement with a high and a low (or zero) current
opens the possiblity to eliminate thermal EMF voltages in external sensors.
Secondary current sources
The ASSP contains two other high quality current sources supplying a current of approx. 2A at the inputs RSHL and RSHH. These current sources
can be switched on and off at any time to check the correct connection of both terminals. During off state they must not interfere with the high sensitive
voltage inputs, especially the noise level should not be increased. If one of the terminals is an open connection the amplifier goes into saturation and
the overflow bit is set.
Figure 6: Temperature coefficient as function of TRIMBTC setting
ams
AG
Technical
content
still
valid
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