mlx90313 ETC-unknow, mlx90313 Datasheet - Page 4

• Manufacturer Part Number: mlx90313
• Description: Programmable Ir Sensor Interface
• Manufacturer: ETC-unknow

General Description
The MLX90313 is a versatile in-circuit programmable interface, which performs signal conditioning,
linearisation and ambient temperature compensation, particularly for infrared sensors combined with a
thermistor. Other types of sensors can also be used in various configurations. Sensors that can be used
include pressure sensors, strain gauges, acceleration sensors etc.
The amplifier chains in MLX90313 are programmable in very broad ranges of gain, between 50 and
12000 for the IR-chain and between 1 and 120 for the Temp-chain. Both chains consist of high
performance, chopper-stabilized amplifiers, providing excellent noise performance and low offset. The I/O
configuration as well as analog settings are in-circuit programmable by means of the SPI-serial interface.
This serial link can also be used to read out the output signals digitally. The circuit can either provide
linear analog or PWM (Pulse Width Modulated) signal outputs, relative to an analog ground, or several
combinations of analog and digital comparator driven outputs. Two comparators controlled by either one
of the two linearised signals are available on chip with different possibilities for the threshold level, polarity
and switching hysteresis. One of the comparators drives the open drain output. The user can provide the
threshold for this comparator at the IROUT I/O pin with a simple potentiometer.
A bias current for the thermistor can be obtained at the TINP input by connecting an external resistor
between the CREF pin and VSS. The standard package is SOIC-20.
Unique Features
The MLX90313 integrates dual low noise programmable gain amplifier stages. Both thermistor and IR
signal path can be configured to suit a large number of components and applications. The onboard
analog to digital converter (ADC) combined with the digital linearisation unit results in linear output
signals. These output signals are available as analog or digital output signal. Applications requiring digital
temperature information can use single wire PWM output or SPI serial communication. The complete
configuration and calibration is in-system programmable through the SPI interface. Combination of all
these integrated features combined with a thermopile sensor make the MLX90313 a true high accuracy
automotive grade single-chip infrared thermometer.
Absolute Maximum Ratings
Supply Voltage, V
Supply Voltage, V
Supply Voltage, V
Supply Voltage, V
Reverse Voltage Protection
Supply Current, I
Output Current, I
Operating Temperature Range, T
Operating Temperature Range, T
ESD Susceptibility
Rel1 output impedance
MLX90313 Programmable IR sensor Interface
3901090313
OUT
DD
in1
in
in1
in
(overvoltage)
(operating)
(overvoltage)
(operating)
A
S
80V
6V
16V
5.5V
-5V
5.6 mA
3 mA
-40C to +125C
-55C to +150C
2 kV
10 ohms
Page 4
Programmable IR Sensor Interface
MLX90313
Rev 1.0 21-July-2001