ZMD31020 datasheet, PDF - EEWORLD Datasheet

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ZMD31020: DescriptionSPECIALTY ANALOG CIRCUIT, UUC14; Categoryaccessories; File Size1001KB，19 Pages; ManufacturerZMD; Websitehttp://www.zmd.de/

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ZMD31020 Overview

SPECIALTY ANALOG CIRCUIT, UUC14

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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 I C interface

•

Product traceability by user-defined EEPROM

entries

•

Operation temperature range, depending on

product version, up to –40...+125°

•

Supply voltage +4.5...+5.5V

•

Sampling rate

≥100Hz

•

Available in SSOP14 or as die

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

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 I C interface can be used for

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

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°

±0.25% FSO @ -40 to 125°C)

Application Circuit Example

1/19

written consent of the copyright owner. The Information furnished in this publication is preliminary and subject to changes without notice.

ZMD31020

Sensor Signal Conditioner

Datasheet

CONTENT

PIN DESCRIPTION ......................................................................................................................................3

CIRCUIT DESCRIPTION .............................................................................................................................4

2.1 Signal Flow ....................................................................................................................................................4

2.2 Configuration Word........................................................................................................................................5

2.3

Differential Sensor ....................................................................................................................................5

2.4

Temperature Sensing ...............................................................................................................................5

2.5

Analog Input Channel ...............................................................................................................................6

2.5.1

Bridge Polarity Setting .......................................................................................................................6

2.5.2

Programmable Gain Amplifier PGA...................................................................................................6

2.5.3

Analog-to-digital Converter ADC .......................................................................................................6

2.5.4

Temperature Measurement ...............................................................................................................7

2.6

Correction Microcontroller CMC................................................................................................................7

2.7

Parameter EEPROM.................................................................................................................................7

2.8

Sensor Signal Correction Method and Sequence.....................................................................................8

2.9

Digital I C Interface ...................................................................................................................................8

2.9.1

Digital Corrected Sensor Signal Output and I/O for Calibration and Device Test .............................8

2.9.2

Data Communication Specifics..........................................................................................................8

2.10

The Analog Output Stage....................................................................................................................10

ELECTRICAL SPECIFICATION.................................................................................................................10

3.1

Absolute maximum ratings......................................................................................................................10

3.2

Operating Conditions ..............................................................................................................................10

3.3

Electrical Parameters..............................................................................................................................11

3.3.1

Power Supply...................................................................................................................................11

3.3.2

PGA & 12-bit Input ADC ..................................................................................................................11

(4)

3.3.3

Temperature Measurement: Current Sources, on-chip Diode & 12-bit ADC ..............................11

(1)

3.3.4

12-bit ADC ...................................................................................................................................12

3.3.5

EEPROM programming ...................................................................................................................12

3.3.6

Serial I C Interface...........................................................................................................................12

(2)

3.3.7

11-bit Output DAC & Output BUFFER .........................................................................................14

3.3.8

Total System ....................................................................................................................................14

PACKAGE DIMENSIONS ..........................................................................................................................15

DIE DIMENSIONS AND PAD COORDINATES .........................................................................................16

5.1

Die Dimensions .......................................................................................................................................16

5.2

Pad Coordinates .....................................................................................................................................17

EVALUATION KIT “ZMD31020KIT” ...........................................................................................................18

ORDERING INFORMATION ......................................................................................................................19

RELATED DOCUMENTS...........................................................................................................................19

2/19

written consent of the copyright owner. The Information furnished in this publication is preliminary and subject to changes without notice.

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 I C-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 I C 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

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

TS: selects on-chip vs. off-chip temperature sensor

Bit 5

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:

Temperature sensing diode

off chip

on chip

5/19

written consent of the copyright owner. The Information furnished in this publication is preliminary and subject to changes without notice.

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