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AS8500 Datasheet(PDF) 21 Page - ams AG

No. de pieza AS8500
Descripción Electrónicos  Universal multi pupose data aquisition system
PDF  41 Pages
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Fabricante Electrónico  AMSCO [ams AG]
Página de inicio  http://www.ams.com
Logo AMSCO - ams AG

AS8500 Datasheet(HTML) 21 Page - ams AG

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AS8500 - Data Sheet
austriamicrosystems
Revision 1.2, 08-Junel-06
www.austriamicrosystems.com
Page 21 of
41
7.5.5
ZZR Zener-Zap register (188 bits ):
For the AS8500 the zener zap registers are set to a predefined default value. As an exception the TRIMA bits
in the ZTR subregister is factory adjusted for minimum amplifier offset to ensure optimum linearity over input
range.
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
UNIT
0
TC of reference
TRIMBTC
5
Bits
1
absolute value of reference
TRIMBV
5
Bits
2
amplifier offset
TRIMA
5
Bits
3
current source for external
temperature
TRIMC
5
Bits
4
∑ trim bits
TRIMREG
20
Bits
subregister ZCL: calibration bits ( 110 bits )
Nr.
PARAMETER
SYMBOL
WORD
WIDTH
UNIT
0
Calibration G=6, I
CGI1
11
Bits
1
Calibration G=24, I
CGI2
11
Bits
2
Calibration G=50, I
CGI3
11
Bits
3
Calibration G=100, I
CGI4
11
Bits
4
Calibration U0
CAU0
11
Bits
5
Calibration U1
CAU1
11
Bits
6
Calibration U2
CAU2
11
Bits
7
Calibration U3
CAU3
11
Bits
8
Calibration U4
CAU4
11
Bits
9
Calibration U5
CAU5
11
Bits
10
∑ cal. Bits
ZCL
110
Bits
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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