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AS8501 数据表(PDF) 21 Page - ams AG

部件名 AS8501
功能描述  High precision voltage and current measurement sensor interface
PDF  41 Pages
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制造商  AMSCO [ams AG]
网页  http://www.ams.com
标志 AMSCO - ams AG

AS8501 数据表(HTML) 21 Page - ams AG

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AS8501 - Data Sheet
austriamicrosystems
Revision 1.1, 04-April-06
www.austriamicrosystems.com
Page 20 of 40
7.5.5
ZZR Zener-Zap register (188 bits )
Nr.
ZZR bits
183-187
163-182
53-162
0-52
NOTE
0
ZLO
ZTR
ZCL
ZTC1)
2)
Notes:
1)
5 bits are reserved for:
- 1 bit eventually destroyed during testing,
- 2 bits for testing programmed 0 and 1
- 2 bits reserved for locking
2)
due to a limited driving capability of the ZZR-cells the maximum reading speed is limited to 500 kHz
subregister ZLO: Zener spare bits ( 5 bits )
Nr.
Name
SYMBOL
WORD WIDTH
Default Hex
1
Reserved bits
ZLO
5
F
subregister ZTR: trimming bits (20 bits)
Nr.
PARAMETER
SYMBOL
WORD
WIDTH
Default
Dec1)
UNIT
NOTE
0
TC of reference
TRIMBTC
5
0
Bits
1
absolute value of reference
TRIMBV
5
0
Bits
2
amplifier offset
TRIMA
5
0
Bits
3
current source for external
temperature
TRIMC
5
0
Bits
4
∑ trim bits
TRIMREG
20
Bits
Notes:
1)
Default values must be written before start of the test
subregister ZCL: calibration bits ( 110 bits )
Nr.
PARAMETER
SYMBOL
WORD
WIDTH
Default
Dec3)
UNIT
NOTE
0
Calibration G=6, I
CGI1
11
1548
Bits
1),4)
1
Calibration G=24, I
CGI2
11
1548
Bits
1),4)
2
Calibration G=50, I
CGI3
11
1548
Bits
1),4)
3
Calibration G=100, I
CGI4
11
1548
Bits
1),4)
4
Calibration U0
CAU0
11
1548
Bits
1),4)
5
Calibration U1
CAU1
11
1548
Bits
1),4)
6
Calibration U2
CAU2
11
1548
Bits
1),4)
7
Calibration U3
CAU3
11
1548
Bits
1),4)
8
Calibration U4
CAU4
11
1548
Bits
1),4)
9
Calibration U5
CAU5
11
1548
Bits
2),4)
10
∑ cal. Bits
ZCL
110
Bits
Notes:
1)
Decimal default value of the calibration constant for voltage and current is calculated
using formula: CGdef=Nmax/NADdef=(Vref*1024)/(Vin*Gmax)=1548
2)
Default calibration constant for absolute value of the voltage proportional to absolute
temperature is the same as for any other range because it uses the same amplifier and
max voltage at max. temperature is approx. 150mV and the gain selected must be g0.
3)
Default values must be written before start of the test
4)
Calibration constants are selected dependent on state of M1 ( see table below). For M1=1 one of
CGI1 to CGI4 is selected according to selected gain of amplifier. For M1=0 the selection of the
calibration constants is defined by bits (cu2,cu1,cu0), which are part of CRA and CRB registers and
are defined via SDI interface independently of any other selection.



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