参数资料
型号: AS8501-ASOU
厂商: ams
文件页数: 18/41页
文件大小: 0K
描述: IC DATA ACQ 16-SOIC
特色产品: AS8501 High Precision Data Acquisition Ics
标准包装: 46
类型: 数据采集系统(DAS)
输入类型: 模拟,数字
输出类型: 模拟,数字
接口: 串行
电流 - 电源: 5mA
安装类型: 表面贴装
封装/外壳: 16-SOIC(0.295",7.50mm 宽)
供应商设备封装: 16-SOIC
包装: 管件
产品目录页面: 803 (CN2011-ZH PDF)
AS8501 - Data Sheet
austriamicrosystems
Revision 1.1, 04-April-06
www.austriamicrosystems.com
Page 24 of 40
subregister TRIMBTC
change of reference voltage Uo and TC-value with TRIMBTC bits
Nr.
trimbtc0
VREF
TC
Notes
trimbtcs
trimbtc3
trimbtc2
1
trimbtc1
1
mV
ppm/K
0
Uo
TCo
1),2)
1
0
1
Uo -1*5.2
TCo -1*12.7
1),2)
2
0
1
0
Uo -2*5.2
TCo -2*12.7
1),2)
..
14
0
1
0
Uo –14*5.2
TCo -14*12.7
1),2)
15
0
1
Uo –15*5.2
TCo -15*12.7
1),2)
16
1
0
Uo
1),2)
17
1
0
1
Uo +1*5.2
TCo +1*12.7
18
1
0
1
0
Uo +2*5.2
TCo -2*12.7
1),2)
..
30
1
0
Uo +14*5.2
TCo -14*12.7
1),2)
31
1
Uo +15*5.2
TCo -15*12.7
Notes:
1)
Uo is the reference voltage in mV and TCo is the TC value in ppm/K at TRIMBV = 00000
2)
Every step of TRIMBTC settings brings
$BTC=5.2 mV change in absolute value of the reference voltage and
S=12.7 ppm/K change in the slope of temperature dependence. So for trimming the temperature coefficient of
the band-gap reference 2 measurements are recommended ( at T1=25oC and at T2=125oC ). If the measured TC
value is TCm then the number that should be written into the TRIMBTC for minimum final TC is calculated as
trimBTC=int(TCM/12.7) for positive values and trimBTC=16+int(-TCM/12.7) for negative values.
The absolute voltage is also changed in this way, which must be compensated by bringing back the absolute value by changing the TRIMBV
register. Usually the TRIMBVx=-TRIMBTCx+1 is sufficient. If further accuracy or change of absolute value is necessary it can be adjusted by
making some more measurements and adjustments.
ZZR REGISTER:
ZTR
ZCL
ZTC
20
110
53
TRR
CAR
bit0
reg.7
reg.6
5
TRR
CAR
data in
bit0
R/W
188
ZLO
Figure 8: Copying of ZCL and ZTR registers into CAR and TRR registers
ams
AG
Technical
content
still
valid
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