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MLX90313KDF Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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4 / 35 page MLX90313 Programmable IR Sensor Interface MLX90313 Programmable IR sensor Interface Page 4 Rev 1.0 21-July-2001 3901090313 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, Vin1 (overvoltage) 80V Supply Voltage, Vin (overvoltage) 6V Supply Voltage, Vin1 (operating) 16V Supply Voltage, Vin (operating) 5.5V Reverse Voltage Protection -5V Supply Current, IDD 5.6 mA Output Current, IOUT 3 mA Operating Temperature Range, TA -40C to +125C Operating Temperature Range, TS -55C to +150C ESD Susceptibility 2 kV Rel1 output impedance 10 ohms |
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