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ZSC31150FLC-T Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers

Part # ZSC31150FLC-T
Description  Fast Automotive Sensor Signal Conditioner
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ZSC31150
Fast Automotive Sensor Signal Conditioner
Data Sheet
August 16, 2011
© 2011 Zentrum Mikroelektronik Dresden AG — Rev. 1.08
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 subject to changes without
notice.
11 of 24
2.2.
Application Modes
For each application, a configuration set has to be established (generally prior to calibration) by programming
the on-chip EEPROM regarding to the following modes:
Sensor Channel
-
Sensor Mode: Ratiometric bridge excitation in voltage or current supply mode.
-
Input Range: The gain adjustment of the AFE with respect to the maximum sensor signal span and
the zero point of the ADC have to be chosen.
-
Additional Offset Compensation (XZC): The extended analog offset compensation has to be enabled,
if required; e.g., if the sensor offset voltage is near to or larger than the sensor span.
-
Resolution/Response Time: The A/D converter has to be configured for resolution and converting
scheme or ADC order (first or second order). These settings influence the sampling rate and the
signal integration time, and thus, the noise immunity.
Temperature
-
Temperature Measurement: The source for the temperature correction has to be chosen.
2.3.
Analog Front End (AFE)
The Analog Front End (AFE) consists of the Programmable Gain Amplifier (PGA), the Multiplexer (MUX), and
the Analog-to-Digital Converter (ADC).
2.3.1.
Programmable Gain Amplifier (PGA)
Table 2.1 shows the adjustable gains, the sensor signal spans, and the allowed common mode range.
Table 2.1
Adjustable Gains, Resulting Sensor Signal Spans and Common Mode Ranges
Input common mode range
VIN_CM as % of VDDA
14
No.
Overall Gain
aIN
Max. Span
VIN_SP
[mV/V]
13
Gain
Amp1
Gain
Amp2
Gain
Amp3
XZC = Off
XZC = On
1
420
1.8
30
7
2
29 to 65
45 to 55
2
280
2.7
30
4.66
2
29 to 65
45 to 55
3
210
3.6
15
7
2
29 to 65
45 to 55
4
140
5.4
15
4.66
2
29 to 65
45 to 55
5
105
7.1
7.5
7
2
29 to 65
45 to 55
6
70
10.7
7.5
4.66
2
29 to 65
45 to 55
7
52.5
14.3
3.75
7
2
29 to 65
45 to 55
8
35
21.4
3.75
4.66
2
29 to 65
45 to 55
9
26.3
28.5
3.75
3.5
2
29 to 65
45 to 55
10
14
53.75
1
7
2
29 to 65
45 to 55
11
9.3
80
1
4.66
2
29 to 65
45 to 55
12
7
107
1
3.5
2
29 to 65
45 to 55
13
2.8
267
1
1.4
2
32 to 57
not applicable
13
Recommended internal signal range is 75% of supply voltage in maximum.
Span is calculated by the following formula: Span = 75% / gain
14
Bridge in voltage mode, containing maximum input signal (with XZC: +300% Offset), 14-bit accuracy. Refer to the 'ZSC31150
Functional Description' for usable input signal/common mode range at bridge in current mode.


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