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The Analog Mixed Signal Company
ZMD31015
RBicdLiteTM
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 250A (typical) * Operation temperature: -50C to +150C * 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 85C; 0.25% FSO @ -50 to 150C) The RBicdLiteTM is adjustable to nearly all piezo-resistive bridge sensors. Measured and corrected bridge values are provided at the SIGTM 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 PCcontrolled calibration procedure to program a set of calibration coefficients into an on-chip EEPROM. The calibrated RBicdLiteTM 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 RBicdLiteTM particularly well suited for automotive applications. * The RBicdLiteTM 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 RBicdLiteTM 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 RBicdLiteTM Application Circuit
Application Examples
Automotive Industrial Appliances Consumer/Medical
Airflow Differential Pressure * Process Control
* *
* *
Process Control Dataloggers
Filter Check Refrigerant * Pressure Monitoring
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Blood Pressure Meters PDAs * Mobile Phones
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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 (-40C to +125C) E = Extended automotive (-50C to +125C)
* 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
(c) 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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