參數(shù)資料
型號： AS8501-ASOT
廠商： ams
文件頁數(shù)： 17/41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)
AS8501 - Data Sheet
austriamicrosystems
Revision 1.1, 04-April-06
www.austriamicrosystems.com
Page 23 of 40
subregister TRIMA
change of amplifier offset with TRIMA bits
The offset of the PGA should be trimmed to a mimimum absolute value to guarantee the
full dynamic range with all gain settings.
Nr.
trima0
Voffset
Notes
trimas
trima3
trima2
trima1
mV
0
Uos
1),2) ,3)
1
0
1
Uos -1*1.34
1),2)
2
0
1
0
Uos -2*1.34
1),2)
..
14
0
1
0
Uos –14*1.34
1),2)
15
0
1
Uos –15*1.34
1),2)
16
1
0
Uos
1),2)
17
1
0
1
Uos +1*1.34
18
1
0
1
0
Uos +2*1.34
1),2)
..
30
1
0
Uos +14*1.34
1),2)
31
1
Uos +15*1.34
Notes:
1)
Uos is the input offset voltage in mV at TRIMA = 00000
2)
Every step of TRIMA settings brings
$offset=1.34 mV change in absolute value of the input offset voltage.
If the measured value is Uos then the number that should be written into the TRIMA for minimum
final absolute value is calculated as TRIMA=int((Uos)/1.34) for Uos above zero and
TRIMA=16+int(-Uos)/1.34) for Uos below zero.
3)
The input offset voltage can be measured with chopping and dechopping bits being cleared in register CRG.
Any input channel as well as gain settings can be used. The input should be shorted to avoid any external voltages to interfere with the
measurement. If the measured output voltage is Va then the offset voltage is calculated acc. Vos = Va/gain.
subregister TRIMBV
change of reference voltage Uo with TRIMBV bits
Nr.
trimbv0
VREF
Notes
trimbvs
trimbv3
trimbv2
trimbv1
mV
0
Ua
1),2)
1
0
1
Ua -1*5.1
1),2)
2
0
1
0
Ua -2*5.1
1),2)
..
14
0
1
0
Ua –14*5.1
1),2)
15
0
1
Ua –15*5.1
1),2)
16
1
0
Ua
1),2)
17
1
0
1
Ua +1*5.1
18
1
0
1
0
Ua +2*5.1
1),2)
..
30
1
0
Ua +14*5.1
1),2)
31
1
Ua +15*5.1
Notes:
1)
Ua is the reference voltage in mV at TRIMBTC = 00000, the optimum value is 1.232V.
2)
Every step of TRIMBV settings brings
$BV=5.1 mV change in absolute value of the reference voltage.
For trimming the TC value and absolute value of the reference voltage it is recommended to trim the TC
value first and then trim the absolute value since TRIMBTC is changing both TC and absolute value, whereas
TRIMBV is changing only the absolute value.
If the measured absolute value is Uam then the number that should be written into the TRIMBV for optimum
final absolute value is calculated as TRIMBV=int((Uam-1.231)/0.0051) for Uam above the ideal value and
TRIMBV=16+int(-(Uam-1.232)/0.0051) for Uam below the ideal value.
ams
AG
Technical
content
still
valid
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