参数资料
型号: AS8501-ASOT
厂商: ams
文件页数: 3/41页
文件大小: 0K
描述: IC CURRENT MEASURE SOLAR 16-SOIC
标准包装: 1,500
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: 带卷 (TR)
AS8501 - Data Sheet
austriamicrosystems
Revision 1.1, 04-April-06
www.austriamicrosystems.com
Page 10 of 40
7.2.1
Reference voltage
The ASSP contains a highly sophisticated precision reference voltage. Its typical temperature dependence is a slight parabola shaped curve and is
shown in figure 21. This reference voltage is used mainly for the internal AD-converter, but can also be used for external purposes if the impedance of
the external circuitry is high enough.
The absolute value and its temperature coefficient (TC) is given by the content of the TRR register. This opens the possibility to calibrate the reference
voltage to the optimum absolute value (i.e. 1.28 V) and the TC value to zero thus eliminating fully the production spread.
Writing into subregister TRIMBV of TRR changes the absolute value linearly by 5.1 mV per digit as shown in the following graph and described in full
detail in 7.5.7
Trimming the TC value is similarly done by writing into subregister TRIMBTC. Since the TC trimming is also changing the absolute value it is important
to trim the TC first and then the absolute value.
1,1 6
1,2 0
1,2 4
1,2 8
1,3 2
1,3 6
0
5
1 0
15
20
25
3 0
c onte n t of TR IM B V in bits
re
fer
enc
evo
lt
ag
ei
n
V
75 ° C
24 °C
1,12
1,14
1,16
1,18
1,20
1,22
1,24
1,26
10
30
50
70
90
110
resistan ce lo ad in kO h m
refer
ence
vol
tag
ei
n
V
m eas u rem en t
o p en lo o p va lu e
Figure 4: Reference voltage as function of resistance load
Figure 5: Reference voltage as function of temperature
ams
AG
Technical
content
still
valid
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