The
Analog
Mixed Signal Company
ZMD31015
RBic
dLite™
Low-Cost Sensor Signal Conditioner
with Diagnostics
P R E L I M I N A RY
Features
• Digital compensation of sensor offset, sensitivity, temperature
drift and non-linearity
• Programmable analog gain and digital gain;
accommodates bridges with spans < 1mV/V and high offset
• Many diagnostic features on chip (e.g., EEPROM signature,
bridge connection checks, bridge short detection, power loss
detection)
• Independently programmable high and low clipping levels
• 24-bit customer ID field for module traceability
• Digital calibration and configuration via one-wire interface –
quick and precise
• Internal temperature compensation reference
(no external components)
• Option for external temperature compensation with addition
of single diode
• Output options: rail-to-rail ratiometric analog voltage
(12-bit resolution), absolute analog voltage,
digital one-wire-interface
• Supply voltage 2.7 to 5.5V; with external JFET, 5.5 to 30V
• Fast power-up to data out response; output available 5ms after
power up
• Current consumption depends on programmed sample rate;
1mA down to 250µA (typical)
• Operation temperature: –50°C to +150°C
• Fast response time: 1ms (typical)
• High voltage protection up to 30V with external JFET
• No external trimming components required
• High accuracy (±0.1% FSO @ -25 to 85°C;
±0.25% FSO @ -50 to 150°C)
The RBic
dLite
TM
is adjustable to nearly all piezo-resistive bridge
sensors. Measured and corrected bridge values are provided
at the SIG
TM
pin, which can be configured as an analog voltage
output or as a one-wire serial digital output.
The digital one-wire interface can be used for a simple PC-
controlled calibration procedure to program a set of calibration
coefficients into an on-chip EEPROM. The calibrated RBic
dLite
TM
and a specific sensor are mated digitally: fast, precise, and without
the cost overhead associated with trimming by external devices
or laser. Integrated diagnostics functions make the RBic
dLite
TM
particularly well suited for automotive applications.
• The RBic
dLite
TM
Development Kit is available –
includes the Development Board, SOP8 samples, software,
and documentation.
• Support for industrial mass calibration is available
• Quick circuit customization possible for large production volumes
Application Circuit
Brief Description
The RBic
dLite
TM
is a CMOS integrated circuit for highly accurate
amplification and sensor-specific correction of bridge sensor
signals. Digital compensation of sensor offset, sensitivity,
temperature 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.
Typical RBic
dLite
TM
Application Circuit
Application Examples
Automotive
Industrial
Appliances
Consumer/Medical
Airflow
•
Differential Pressure
•
Process Control
•
Process Control
•
Dataloggers
•
Filter Check
•
Refrigerant
•
Pressure Monitoring
•
Blood Pressure Meters
•
PDAs
•
Mobile Phones
•
Ordering Code
Example:
ZMD Product Sales Name
ZMD31015 BIF-T
Delivery Form**
T = delivery in tube
R = delivery in tape on reel
S = special (e.g. sample box)
Design Revision
A = first design revision
B = second design revision
etc.
Die/Package Options
B
C
D
F
G1
=
=
=
=
=
tested dice on unsawn wafer
tested dice on frame
tested dice in waffle pack
finished parts in plastic package
finished parts in “green” plastic package
(lead-free terminals – pure Sn)
Target Application Area/
Usual Operating Temperature Range*
I = Industrial (-40°C
to
+125°C)
E = Extended automotive (-50°C
to
+125°C)
* only for serial parts; engineering samples don’t have this character
** only for finished parts in plastic package
Engineering samples can be marked with the additional characters “ES”.
Not all possible product versions are available. Please ask ZMD sales
if and when a certain product version is available.
For further
information:
ZMD AG
Grenzstrasse 28
01109 Dresden
Germany
Tel +49.351.8822.366
Fax +49.351.8822.337
sales@zmd.de
ZMD America, Inc.
201 Old Country Road, Suite 204
Melville, NY 11747
USA
Tel +1.631.549.2666
Fax +1.631.549.2882
sales@zmda.com
ZMD Far East
1F, No. 14, Lane 268, Sec. 1 Guangfu Rd.
HsinChu City 300
Taiwan
Tel +886.3.563.1388
Fax +886.3.563.6385
sales@zmd.de
© ZMD AG 2006 · Rev. 0.1 · Preliminary
www.zmd.biz
This information applies to a product under development. Its characteristics and specifications are subject to change without notice. ZMD assumes no obligation regarding future manufacture
unless otherwise agreed to in writing. The information furnished hereby is believed to be true and accurate. However, ZMD shall not be liable to any customer, licencee or any other third party
for any damages in connection with or arising out of the furnishing, performance or use of this technical data. No obligation or liability to any customer, licencee or any other third party shall
result from ZMD‘s rendering of technical or other services.
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