ZMD31014
RBic
iLite
™
Low-Cost Sensor Signal Conditioner with I
2
C & SPI
Brief Description
The RBic
iLiteTM
is a CMOS integrated circuit for highly
accurate amplification and analog-to-digital conver-
sion of differential and half-bridge input signals. The
RBic
iLiteTM
can compensate the measured signal for
offset, 1
st
and 2
nd
order span, and 1
st
and 2
nd
order
temperature (Tco and Tcg). It is well-suited for sen-
sor-specific correction of bridge sensors. Digital
compensation of signal offset, sensitivity, tempera-
ture drift, and non-linearity is accomplished via an
internal digital signal processor running a correction
algorithm with calibration coefficients stored in a
non-volatile EEPROM.
The RBic
iLiteTM
is adjustable to nearly all piezo-resis-
tive bridge sensors. Measured and corrected bridge
values are provided at digital output pins, which can
be configured as I
2
C or SPI. The digital I
2
C interface
can be used for a simple PC-controlled calibration
procedure to program calibration coefficients into an
on-chip EEPROM. The calibrated RBic
iLiteTM
and a
specific sensor are mated digitally: fast, precise, and
without the cost overhead associated with trimming
by external devices or laser trimming.
Integrated diagnostics functions make the RBic
iLiteTM
particularly well-suited for safety-critical applications.
Benefits
•
•
•
•
•
Simple PC-controlled configuration and single-
pass digital calibration via I2C interface – quick,
precise, and low cost; SPI option for measure-
ment modeneed for external trimming
Eliminates
components
On-chip diagnostic features add safety to the
application (e.g., EEPROM signature, bridge
connection checks, bridge short detection).
Low-power Sleep Mode lengthens battery life
Enables multiple sensor networks
Available Support
•
•
•
Evaluation Kit
Application Notes
Mass Calibration Solution
Physical Characteristics
•
•
•
•
•
Features
•
•
•
•
•
•
•
Wide supply voltage capability: 2.7V to 5.5V
Current consumption as low as 70μA depending
on programmed sample rate
Low-power Sleep Mode (<2μA @ 25°C)
Operation temperature: -40°C to +125°C
Small SOP8 package
High accuracy (±0.1% FSO @ -25 to +85°C;
±0.25% FSO @ -40 to +125°C)
2nd order charge-balancing analog-to-digital
converter provides low noise, 14-bit data at
sample rates exceeding 2kHz
Fast power-up to data output response: 3ms
at 4MHz
Digital compensation of sensor offset, sensitivity,
temperature drift, and non-linearity
Eight programmable analog gain settings com-
bine with a digital gain term; accommodates
bridges with spans <1mV/V and high offset
Internal or optional external temperature com-
pensation for sensor correction and for corrected
temperature output
48-bit customer ID field for module traceability
ZMD31014 Application: I
2
C Interface, Low Power
Bsink Option, Internal Temperature Correction
V
supply
RBic
iLite
™
VSS
BSINK
VBP
VBN
VDD
INT/SS
SDA/MISO
SCL/SCLK
(2.7V to 5.5V)
0.1µF
GND
© 2009 ZMD AG — Rev. 1.0
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.
ZMD31014
RBic
iLite
™
Low-Cost Sensor Signal Conditioner with I
2
C & SPI
ZMD31014 Block Diagram
Temperature
0.1µF
V
DD
(2.7V - 5.5V)
Applications
Industrial:
building automation,
dataloggers, pressure meters, leak
detection monitoring
Medical:
infusion pumps, blood
pressure meters, air mattresses,
apnea monitors
White Goods / Appliances:
fluid
level, refrigerant
Consumer:
body monitors, portable
monitors, desktop weather stations,
bathroom scales, toys/games
Sensor
Diagnostics
Reference
POR/Oscillator
RBic
iLite
™
V
BP
V
BN
INMUX
A
PreAmp
14-Bit ADC
D
Optional
Bsink
Bsupply
Optional
EEPROM
w/
Charge Pump
& Checksum
DSP
Core
I
2
C or SPI
Interface
INT/SS
SDA/MISO
SCL/SCLK
RTD
V
SS
Application:
Bridge TC Used for External Temperature
V
Supply
Application:
Generic Differential A2D Converter
RBic
iLite
™
VSS
BSINK
VBP
VBN
VDD
INT/SS
SDA/MISO
SCL/SCLK
0.1µF
GND
Ordering Information
Sales Code
ZMD31014DAB
ZMD31014DAC
ZMD31014DAD
ZMD31014DAG1
ZMD31014KIT
Description
ZMD31014 RBic
iLite
™ Die — Temperature range: -40°C to +125°C
ZMD31014 RBic
iLite
™ Die — Temperature range: -40°C to +125°C
ZMD31014 RBic
iLite
™ Die — Temperature range: -40°C to +125°C
ZMD31014 RBic
iLite
™ SOP8 (150 mil) — Temperature range: -40° to +125°C
ZMD31014 SSC Evaluation Kit: Communication Board, SSC Board, Sensor Replacement Board,
Software, USB Cable, 5 IC Samples
Package
Unsawn on Wafer
Sawn on Wafer Frame
Waffle Pack
Tube: add “-T” to sales code
Reel: add “-R”
Kit
Sales and Further Information
Zentrum Mikroelektronik
Dresden AG (ZMD AG)
Grenzstrasse 28
01109 Dresden
Germany
Phone
Fax
www.zmdi.com
ZMD AG, Japan Office
2nd Floor, Shinbashi Tokyu Bldg.
4-21-3, Shinbashi, Minato-ku
Tokyo, 105-0004
Japan
Phone
Fax
+81.3.6895.7410
+81.3.6895.7301
sales@zmdi.com
ZMD Far East, Ltd.
3F, No. 51, Sec. 2,
Keelung Road
11052 Taipei
Taiwan
Phone
Fax
ZMD America, Inc.
8413 Excelsior Drive
Suite 200
Madison, WI 53717
USA
Phone
Fax
+49 (0)351.8822.7.772
+49(0)351.8822.87.772
+01 (608) 829-1987
+01 (631) 549-2882
+886.2.2377.8189
+886.2.2377.8199
DISCLAIMER: This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Zentrum Mikroelektronik Dresden AG
(ZMD AG) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. The information furnished hereby is believed to be true and accurate. However, under
no circumstances shall ZMD AG be liable to any customer, licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever
arising out of or in any way related to the furnishing, performance, or use of this technical data. ZMD AG hereby expressly disclaims any liability of ZMD AG to any customer, licensee or any
other third party, and any such customer, licensee and any other third party hereby waives any liability of ZMD AG for any damages in connection with or arising out of the furnishing, perfor-
mance or use of this technical data, whether based on contract, warranty, tort (including negligence), strict liability, or otherwise.
© 2009 ZMD AG — Rev. 1.0
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.
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