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ZMD31050 Datasheet(PDF) 6 Page - Zentrum Mikroelektronik Dresden AG

Part No. ZMD31050
Description  Advanced Differential Sensor Signal Conditioner
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Maker  ZMD [Zentrum Mikroelektronik Dresden AG]
Homepage  http://www.zmdi.com
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 6 page
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Copyright © 2005, ZMD AG, Rev. 0.95, 2005-09-16
6/20
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior
written consent of the copyright owner. The Information furnished in this publication is preliminary and subject to changes without notice.
ZMD31050
Advanced Differential Sensor Signal Conditioner
Datasheet
PRELIMINARY
PGA gain
aIN
Max. span
VIN_SP
in mV/V
Calculation
factor k
Offset shift per step
in % full span
Approx. maximum
offset shift in mV/V
Approx. maximum
shift in [% VIN_SP]
(@ ± 25)
420
2
3,0
15%
+/- 9
450
280
3
1,833
9%
+/- 8
266
210
4
3,0
15%
+/- 18
450
140
6
1,833
9%
+/- 18
300
105
8
1,25
6%
+/- 15
187
70
12
1,833
9%
+/- 33
275
52,5
16
1,25
6%
+/- 44
275
35
24
1,833
9%
+/-66
275
26,3
32
1,25
6%
+/- 87
272
14
50
3,0
15%
+/- 270
540
9,3
80
1,833
9%
+/- 250
312
7
100
1,25
6%
+/- 225
225
2,8
280
0,2
1%
+/- 90
32
Table 2: Analog Zero Point Shift Ranges
1.3.3.
Measurement Cycle realized by Multiplexer
The Multiplexer selects, depending on EEPROM settings, the following inputs in a certain sequence.
§
Bridge temperature signal measured by external diode
§
Bridge temperature signal measured by internal pn-junction
§
Bridge temperature signal measured by bridge resistors
§
Separate temperature signal measured by external thermistor
§
Internal offset of the input channel measured by input short circuiting
§
Pre-amplified bridge sensor signal
The
complete
measurement
cycle
is
controlled by the CMC. The cycle diagram
at the right shows its principle structure.
The EEPROM adjustable parameters are:
§
Pressure measurement count,
n=<1,2,4,8,16,32,64,128>
§
Enable temperature measurement 2,
e2=<0,1>
After Power ON the start routine is called. It
contains
the
pressure
and
auto
zero
measurement. When enabled it measures the
temperature and its auto zeros.
Fig. 4: Measurement cycle ZMD31050
Start routine
n
Pressure measurement
1
Temp 1 auto zero
n
Pressure measurement
1
Temp 1 measurement
n
Pressure measurement
1
Pressure auto zero
n * e2
Pressure measurement
e2
Temp 2 auto zero
→ n * e2 * Pressure measurement
e2 *
Temp 2 measurement




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