The
Analog
Mixed Signal Company
ZMD31035
Automotive Sensor Signal
Conditioner
PRELIMINARY
Features
•
Digital compensation of sensor offset, sensitivity,
temperature drift and non-linearity
•
Adjustable to nearly all piezo-resistive bridge sensors types
•
Digital one-shot calibration: quick and precise
•
Selectable temperature compensation reference:
internal or external diode
•
Output options: analog voltage (0 to 5V) or one-wire-interface
(LIN compatible protocol)
•
Digital sensor calibration via one-wire-interface
•
Sampling rate typically 125Hz
•
High voltage protection
•
Reverse polarity and short circuit protection
•
Operation temperature –40 to +125°C
•
Supply voltage 4.5 to 5.5V
Benefits
•
No external trimming components required
•
PC-controlled configuration and calibration
via one-wire interface – simple, low cost
•
High accuracy (±0.1% FSO @ -25 to 85°C;
±0.25% FSO @ -40 to 125°C)
Brief Description
The ZMD31035 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 a 16-bit RISC micro-controller running
a correction algorithm with calibration coefficients stored
in a non-volatile EEPROM.
The ZMD31035 is adjustable to nearly all piezo-resistive
bridge sensors. Measured values are provided at the
analog voltage output or at the one-wire-interface.
The digital one-wire-interface can be used for a simple
PC-controlled calibration procedure, in order to program
a set of calibration coefficients into an on-chip EEPROM.
Thus a specific sensor and a ZMD31035 are mated digi-
tally: fast, precise and without the cost overhead associ-
ated with trimming by external devices or laser.
The ZMD31035 is optimized for automotive environ-
ments by it’s protection circuitry and excellent electro-
magnetic compatibility.
Application Circuit
VSSA
VDDB
VTN
VSSA
VDDA
ZMD31035
TEMP.
SENSING
DIODE
100n
DI
CLK
VDD
100n
VDDE
100n
VSS
VBN
BRIDGE
SENSOR
VSSB
VBP
AOUT
VSSE
• Evaluation kit will be available, containing PCBs,
SSOP14 samples, software, documentation
• Support for industrial mass calibration available
• Quick circuit customization possible for large
production volumes
15n
GND
OUT
OWI
V
SUPPLY
4.5...5.5V
ZMD [ Zentrum Mikroelektronik Dresden AG ]
