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PDF ZMD31020 Data sheet ( Hoja de datos )
| Número de pieza | ZMD31020 | |
| Descripción | Sensor Signal Conditioner | |
| Fabricantes | Zentrum Mikroelektronik Dresden | |
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ZMD31020
Sensor Signal Conditioner
Datasheet
Features
• Digital compensation of sensor offset, sensitivity,
temperature drift and non-linearity
• Adjustable to nearly all piezo-resistive bridge
sensor types
• Digital one-shot calibration: quick and precise
• Selectable temperature compensation reference:
internal or external diode
• Output options: 0...5V analog ratiometric voltage
or 12 bit digital I2C interface
• Product traceability by user-defined EEPROM
entries
• Operation temperature range, depending on
product version, up to –40...+125°C
• Supply voltage +4.5...+5.5V
• Sampling rate ≥100Hz
• Available in SSOP14 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 to 85°C;
±0.25% FSO @ -40 to 125°C)
Brief Description
ZMD31020 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.
ZMD31020 accommodates nearly all piezo-resistive
bridge sensor types.
The bi-directional digital I2C interface 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 ZMD31020 are mated digitally: fast,
precise and without the cost overhead associated with
trimming by external devices or laser.
ZMD31020 has been designed for industrial and
consumer applications and is specifically suited for
most pressure sensors.
§ Demo kit available (incl. calibration PCB,
SSOP14 samples, software, technical
documentation)
§ Support for industrial calibration available
§ Quick circuit customization possible for large
production volumes
Application Circuit Example
Copyright © 2004, ZMD AG, Rev. 1.6, 2005-05-19
1/19
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  
ZMD31020
Sensor Signal Conditioner
Datasheet
The digital signal correction takes place in the calibration micro-controller (CMC). It is based on a special
correction formula located in the ROM and on a set of sensor-specific calibration parameters stored in the
EEPROM. The resulting corrected sensor signal is output via the I2C-interface (with 12 bits resolution) , or, after
conversion by the DAC, as analog voltage (with 11 bits resolution) at the buffer amplifier (BAMP). The
programming of the configuration data and of the calibration parameters into the EEPROM (during the
calibration procedure) is also realized via the I2C interface.
2.2 Configuration Word
Many of the following sections, describing each block of ZMD31020 in detail, will refer to configuration bits, part
of the configuration word stored under address &H09 of the parameter EEPROM. These bits are settings for a
number of on-chip device functions and select specific functional or parametrical behaviour.
The contents of the parameter EEPROM are determined and calculated, written and stored under PC-control
during the calibration procedure. Hence the configuration bits are coded and non-volatile stored once calibration
of a ZMD31020 device / sensor pair has taken place, and will remain unchanged during regular sensing
operation, unless re-calibration is performed
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
- - - - - - - - - CH TS BP G1 G0 O1 O0
Configuration word, stored under address &H09 of the parameter EEPROM
Only 7 bits of the configuration word are relevant settings as follows:
Bit 0, Bit 1
O0, O1: select ADC’s offset compensation
Bit 2, Bit 3
G0, G1: select PGA’s gain
Bit 4
BP: cross-switches differential sensor inputs VBP and VBN
Bit 5
TS: selects on-chip vs. off-chip temperature sensor
Bit 6
CH: enables PGA’s chopper-stabilization
The possible options of these settings are shown in table form in the following paragraphs.
2.3 Differential Sensor
ZMD31020 has been specifically designed for ratiometric differential sensors, e.g. Wheatstone bridge type
sensors. A ratiometric sensor typically generates a differential output signal proportional to the supply voltage
applied to it. The sensor is supplied from VDDB1 or VDDB2 (whichever pin/pad is more favourable layoutwise)
at the + side and tied to VSSB at the – side. The sensor's differential output signal is routed to VBP and VBN.
Sensor and signal conditioner ZMD31020 have the same supply (see block schematic in section 2.1), hence the
differential input voltage seen by ZMD31020 is ratiometric to it’s supply voltage.
2.4 Temperature Sensing
The characteristic of a sensor element tends to change with temperature. To compensate for this, ZMD31020 is
equipped to measure temperature by an external diode or by an on-chip pn-junction. TS – configuration bit 5 –
will select the desired sensor option as follows:
TS Temperature sensing diode
0 off chip
1 on chip
Copyright © 2004, ZMD AG, Rev. 1.6, 2005-05-19
5/19
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 
ZMD31020
Sensor Signal Conditioner
Datasheet
3.3 Electrical Parameters
(for TAMB = -40°C ... +125°C; supply voltage: 4.5V ... 5.5V; all voltages referred to VSSA = VSS)
3.3.1 Power Supply
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNIT
Supply current
IDD + IDDA
no sensor, no diode
connected;
VOUT open
7.7 mA
3.3.2 PGA & 12-bit Input ADC
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
Differential input voltage range options @ Input span VIN_SP = 52 mV/V; aIN = 15.66
Diff. inp. volt. range 1
VIN_DIFF_1
RSADC = 15/16
-3
49
Diff. inp. volt. range 2
VIN_DIFF_2
RSADC = 7/8
-6
46
Diff. inp. volt. range 3
VIN_DIFF_3
RSADC = 3/4
-13
39
Diff. inp. volt. range 4
VIN_DIFF_4
RSADC = 1/2
-26
26
Sensitivity
SIN VDDA = 5V
73
Differential input voltage range options @ Input span VIN_SP = 36 mV/V; aIN = 24
Diff. inp. volt. range 1
VIN_DIFF_1
RSADC = 15/16
-2
34
Diff. inp. volt. range 2
VIN_DIFF_2
RSADC = 7/8
-4
32
Diff. inp. volt. range 3
VIN_DIFF_3
RSADC = 3/4
-9
27
Diff. inp. volt. range 4
VIN_DIFF_4
RSADC = 1/2
-18
18
Sensitivity
SIN VDDA=5V
50
Differential input voltage range options @ Input span VIN_SP = 20 mV/V; aIN = 42
Diff. inp. volt. range 1
VIN_DIFF_1
RSADC = 15/16
-1
19
Diff. inp. volt. range 2
VIN_DIFF_2
RSADC = 7/8
-2
18
Diff. inp. volt. range 3
VIN_DIFF_3
RSADC = 3/4
-5
15
Diff. inp. volt. range 4
VIN_DIFF_4
RSADC = 1/2
-10
10
Sensitivity
SIN VDDA=5V
29
UNIT
mV/V
mV/V
mV/V
mV/V
µV/LSB
mV/V
mV/V
mV/V
mV/V
µV/LSB
mV/V
mV/V
mV/V
mV/V
µV/LSB
Diff. input offset current IIN_OFF
-10
Note, that the parameter “RSADC” is equal to the former “CRROB”.
10 nA
3.3.3 Temperature Measurement: Current Sources, on-chip Diode & 12-bit ADC (4)
PARAMETER
Current source
TC current source (1)
Input voltage range
TC forward drop
Sensitivity
SYMBOL
ITS
TCI_TS
VTN
TCDROP
ST
CONDITIONS
pin / pad VTN
pin / pad VTN
rel. to VDDB1 = VDDB2
on-chip temp. sensor
pin / pad VTN
MIN
20
-2000
-810
-1.9
0.84
TYP
40
-2.1
0.97
MAX
55
2000
-200
-2.3
1.1
UNIT
µA
ppm/K
mV
mV/K
mV/ LSB
Copyright © 2004, ZMD AG, Rev. 1.6, 2005-05-19
11/19
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 | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ZMD31020.PDF ] | |
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