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MLX902xx Name of Sensor
Rev Y.X
22/Aug/98
Page 1
MLX90308CAB
Programmable Sensor Interface
MLX90308CAB Programmable Sensor Interface
Page 1
Rev 1.1
11/Sept/00
Features and Benefits
Microprocessor-controlled signal conditioning for bridge-type sensors
Suited for low-cost sensors: reduction of non-linearity by programmable coefficients
External or internal temperature sensor for compensating temperature errors
Versatile output signal ranges: 4, 5, 10, or 11VDC; 4 to 20 mA loop
Mass calibration easy with 2400 or 9600 baud UART
Power supply from 6 to 35VDC
Applications
Pressure transducers
Accelerometers
Temperature sensor assemblies
Linear position sensors
Ordering Information
art No.
Temperature Suffix
Package
Option
Temperature Range
MLX90308
L
LW
-CAB
-40C to 140C Automotive
MLX90308
L
UD*
-CAB
-40C to 140C Automotive
*UD denotes unpackaged die
Description
The MLX90308CAB is a dedicated microcontroller
which performs signal conditioning for sensors wired
in bridge or differential configurations. Sensors that
can be used include thermistors, strain gauges, load
cells, pressure sensors, accelerometers, etc. The
signal conditioning includes gain adjustment, offset
control,
high
order
temperature
and
linearity
compensation. Compensation values are stored in
EEPROM and are re-programmable. Programming is
accomplished by using a PC, with an interface circuit
(level shifting and glue logic), and provided software.
The application circuits can provide an output of an
absolute voltage, relative voltage, or current. The
output can be range limited with defined outputs
when the signal is beyond the programmed limits.
Other features include alarm outputs and level
steering. The robust electrical design allows the
MLX90308CAB to be used where most signal
conditioning and sensor interface circuits cannot be
used. Voltage regulation control is provided for
absolute voltage and current modes (external FET
required).
The standard package is a plastic SO16W. The
device
is
static-sensitive
and
requires
ESD
precautions.
Functional Diagram
Supply Regulator
Offset
Gain
VM
CM
TSTB
CMN
VMO
CMO
GND
V
DD
FET
VDD1
FLT
OFC
VBP
VBN
TMP
IO1
IO2
COMS
Temp.
Sensor
& Amp
Offset
DAC
Gain
DAC
Osc
& PLL
POR
Test
&
WDC
ADC
|Converter
I/O Ports
Bidirectional
I/O
UART
Times & IRQs
LX11 Core
EEPROM
RAM
ROM
Analog Signal Chain