The
Analog
Mixed Signal Company
ZMD31030
Automotive Sensor Signal
Conditioner with LIN Interface
PRELIMINARY
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
•
Selectable separate input channel for an external
temperature sensor
•
Output options: PWM (bridge sensor signal)
or LIN interface (bridge and temp. sensor signal)
•
Digital sensor calibration via LIN interface
•
Sampling rate typically 125Hz
•
High voltage protection
•
Reverse polarity and short circuit protection
•
Operation temperature -40 to +125°C
•
Supply voltage 8 to 18V
Brief Description
ZMD31030 is a CMOS integrated circuit for highly-accurate
amplification and sensor-specific correction of bridge sensor
and temperature 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 coeffi-
cients stored in a non-volatile EEPROM.
The ZMD31030 is adjustable to nearly all piezo-resistive bridge
sensors. Measured values are provided at the PWM output
or at
the LIN interface.
The digital LIN bus interface can be used for a simple PC-con-
trolled calibration procedure, in order to program a set of cali-
bration coefficients into an on-chip EEPROM. Thus a specific
sensor and a ZMD31030 are mated digitally: fast, precise and
without the cost overhead associated with trimming by external
devices or laser.
The ZMD31030 is optimized for automotive environments by it’s
protection circuitry and excellent electromagnetic compatibility.
• Evaluation kit will be available, containing PCBs,
SSOP20 samples, software, documentation
• Support for industrial mass calibration available
• Quick circuit customization possible for large
production volumes
Benefits
•
No external trimming components required
•
PC-controlled configuration and calibration
via digital LIN bus interface – simple, low cost
•
High accuracy (±0.1% FSO @ -25 to 85°C;
±0.25% FSO @ -40 to 125°C)
Block Schematic and Application Circuit (Example)
ANALOG SUPPLY
VDDA
DIGITAL SUPPLY
VDD
VB
CONTROL
30k
POWER MANAGEMENT
AND
PROTECTION CIRCUITS
VBAT
VTN
LIN
LIN
CONTROLLER TRANSCEIVER
LIN
LIN
www.lin-subbus.de
VDDB
SENSOR BRIDGE
VBP
VBN
VSSB
ANALOG
SIGNAL
CONDITIONING
DIGITAL
SIGNAL
POST
PROCESSING
I/O
IF
GND
TEST IF
DI
CLK
ANALOG
GROUND
ZMD31030
VSSA
DIGITAL
GROUND
VSS
ZMD [ Zentrum Mikroelektronik Dresden AG ]
