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PDF ZMD31050 Data sheet ( Hoja de datos )
| Número de pieza | ZMD31050 | |
| Descripción | Advanced Differential Sensor Signal Conditioner | |
| Fabricantes | Zentrum Mikroelektronik Dresden | |
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ZMD31050
Advanced Differential Sensor Signal Conditioner
Datasheet
PRELIMINARY
Features
Brief Description
• Digital compensation of sensor offset, sensitivity,
temperature drift and non-linearity
• Accommodates nearly all bridge sensor types
(signal spans from 1 up to 275mV/V processable)
• Digital one-shot calibration: quick and precise
• Selectable compensation temperature T1 source:
bridge, thermistor, internal diode or external diode
• Output options: voltage (0...5V), current
(4...20mA), PWM, I2C, SPI, ZACwireTM (one-wire-
interface), alarm
• Adjustable output resolution (up to 15 bits) versus
sampling rate (up to 3.9kHz)
• Selectable bridge excitation: ratiometric voltage,
constant voltage or constant current
• Input channel for separate temperature sensor
• Sensor connection and common mode check
(Sensor aging detection)
• operation temperature, depending on product
version, up to -40...+125°C (-40...+150°C derated)
• Supply voltage +2.7V...+5.5V
• Available in SSOP16 or as die
Benefits
• No external trimming components required
• PC-controlled configuration and calibration via
digital bus interface - simple, low cost
• High accuracy (±0.1% FSO @ -25...85°C; ±0.25%
FSO @ -40...125°C)
Application Circuit (Examples)
ZMD31050 is a CMOS integrated circuit for highly-
accurate amplification and sensor-specific correction
of bridge sensor signals. The device provides digital
compensation of sensor offset, sensitivity, temperature
drift and non-linearity by a 16-bit RISC micro controller
running a correction algorithm with correction
coefficients stored in non-volatile EEPROM.
The ZMD31050 accommodates virtually any bridge
sensor (e.g. piezo-resistive, ceramic-thickfilm or steel
membrane based). In addition, the IC can interface a
separate temperature sensor.
The bi-directional digital interfaces (I2C, SPI,
ZACwireTM) can be used for a simple PC-controlled
one-shot calibration procedure, in order to program a
set of calibration coefficients into an on-chip
EEPROM. Thus a specific sensor and a ZMD31050
are mated digitally: fast, precise and without the cost
overhead associated with laser trimming, or
mechanical potentiometer methods.
§ Application kit available (SSOP16 samples,
calibration PCB, calibration software, technical
documentation)
§ Support for industrial mass calibration
available
§ Quick circuit customization possible for large
production volumes
100 nF
VSUPP
100 nF
100
100 nF
nF
VDDA = 5 V
+7...+40 V
VSUPP
15 nF
Re
(120 Ω)
Rsens(50 Ω)
Fig.1: Ratiometric measurement with voltage output,
temperature compensation via external diode
Fig.2: Two-wire-(4 to 20) mA configuration [(7 to 40) V],
temperature compensation via internal diode
Refer also chapter 2 for additional application circuits and details
Copyright © 2005, ZMD AG, Rev. 0.95, 2005-09-16
1/20
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.
1 page  
ZMD31050
Advanced Differential Sensor Signal Conditioner
Datasheet
PRELIMINARY
1.3 Analog Front End (AFE)
The analog front end consists of the programmable gain amplifier (PGA), the multiplexer (MUX) and
the analog-to-digital converter (ADC).
1.3.1. Programmable Gain Amplifier
The following tables show the adjustable gains, the processable sensor signal spans and the allowed
common mode range.
No. PGA Gain
Gain aIN Amp1
Gain Gain
Max. span
Amp2 Amp3 VIN_SP in mV/V
Input range
VIN_CM in % VDDA ∗
1 420
30
7
2
2 280
30
4,66
2
2
3
43 - 57
40 - 59
3 210
15
7
2
4
43 - 57
4 140
15
4,66
2
6
40 - 59
5 105 15 3,5 2
8
38 - 62
6 70
7,5 4,66 2
12
40 - 59
7 52,5
7,5
3,5
2
16
38 - 62
8 35
3,75
4,66
2
24
40 - 59
9 26,3
3,75
3,5
2
32
38 - 62
10 14
1
72
50
43 - 57
11 9,3
1
4,66
2
80
40 - 59
12 7
1 3,5 2
13 2,8 1 1,4 2
100
280
38 - 62
21 - 76
Table 1: Adjustable gains, resulting sensor signal spans and common mode ranges
1.3.2. Analog Sensor Offset Compensation - Analog Zero Point Shift (AZS)
The ZMD31050 supports two methods of sensor offset cancellation (zero shift):
• digital offset correction
• analog cancellation for large offset values (up to approx 300% of span)
Digital sensor offset correction will be processed at the digital signal correction/conditioning by the
CMC. Analog sensor offset pre-compensation will be needed for compensation of large offset values,
which would be overdrive the analog signal path by uncompensated gaining. For analog sensor offset
pre-compensation a compensation voltage will be added in the analog pre-gaining signal path (coarse
offset removal). The analog offset compensation in the AFE can be adjusted by 6 EEPROM bits. It
allows an Analog Zero Point Shift up to 300% of the processable signal span.
The zero point shift of the temperature measurements can also be adjusted by 6 EEPROM bits
(ZAZS= -25…+25) and is calculated by:
VAZS / VDDBR= k * ZAZS / ( 20 * aIN)
∗ Bridge in voltage mode, refer “ZMD31050 Functional description” for usable input signal/common mode range at bridge in current mode
Copyright © 2005, ZMD AG, Rev. 0.95, 2005-09-16
5/20
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.
5 Page 
ZMD31050
Advanced Differential Sensor Signal Conditioner
Datasheet
PRELIMINARY
1.6 Voltage Regulator
For ratiometric applications 3V to 5V (±10%) the external supply voltage can be used for sensor
element biasing. If an absolute analog output is desired then the internal voltage regulator with external
power regulation element (FET) can be used. It is bandgap reference based and designed for an
external supply range VSUPP = (7 to 40) VDC. With the voltage regulator the internal supply and sensor
bridge voltage can be varied between 3V and 5V.
1.7 Watchdog and Error Detection
The ZMD31050 detects various possible errors. A detected error is signalized by changing in a
diagnostic mode. In this case the analog output is set to High or Low (maximum or minimum possible
output value) and the output registers of the digital serial interface are set to a significant error code.
A watchdog oversees the continuous working of the CMC and the running measurement loop.
A check of the sensor bridge for broken wires is done permanently by two comparators watching the
input voltage of each input [(VSSA + 0.5V) to (VDDA – 0.5V)]. Add on the common mode voltage of
the sensor is watched permanently (sensor aging).
Different functions and blocks in digital part are watched like RAM-, ROM,- EEPROM- and Register
content continuously, the document “ZMD31050 Functional Description” contains in chapter 1.3.4 a
detailed description of all watched blocks and methods of messaging of errors.
Copyright © 2005, ZMD AG, Rev. 0.95, 2005-09-16
11/20
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.
11 Page | ||
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