MLX90313KDF

MLX90313 Programmable IR Sensor Interface Features and Benefits Dual low noise, low offset, fully programmable amplifier chain 12 bit on-chip ADC Powerful signal conditioning and linearisation unit Multiple output options: 12 bit digital through SPI, 8 bit resolution analog linear signal outputs or 10 bit PWM, both for ambient and object temperature. On-chip programmable digital moving average LPF for ultimate low noise performance ISP I/O-configuration and analog settings, accessible by SPI serial interface. Wide supply voltage range from 4.5V-80V Applications Thermopile + thermistor amplification chain Digital or analog, linear, ambient-compensated IR sensor interface General purpose programmable sensor amplifier/ signal conditioner Ordering Information Part No. MLX90313 Temperature Suffix K Package DF Temperature Range -40C to 125C Automotive Functional Diagram 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. 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 incircuit 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. Additional the circuit can perform simple control applications using on-board comparators Supply Regulator IR+ IR path pwm output option selector IRThermistor path PGA Tinn A/D 12Bit Linearisation unit PGA A/D 12Bit IRout lin non lin pwm Tempout lin non lin Tinp Digital Control Logic Configuration eeprom SPI interface SPI interface MLX90313 Programmable IR sensor Interface 3901090313 Page 1 Rev 1.0 21-July-2001 MLX90313 Programmable IR Sensor Interface MLX90313 Electrical Specifications DC Operating Parameters TA = -40 C to 125 C, VDD = 4.5V to 80V (unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Regulator and consumption Supply voltage range Supply voltage range Supply current Regulated supply voltage Regulated voltage temperature coefficient POR threshold voltage Band-gap reference Analog ground voltage Analog ground thermal coefficient Reference current mirror load drive voltage Common mode input range Common mode rejection ratio Power supply rejection ratio Available gain settings Gain tolerance Amplifier offset Input referred white noise Chopper frequency Output voltage range Output source current Output sink current DC Output impedance, drive DC Output impedance, sink Capacitive load IROUT pin Amplifier bandwidth Common mode input range Common mode rejection ratio Power supply rejection ratio TINP bias current Available gain settings Iod Ios rod ros Cmax BW CMIR CMRR PSSR Itpb Atemp Page 2 f ≤ 100kHz f ≤ 100kHz bias current enabled 0.1 75 75 1/7 1 .1 40 Agnd TCbg Vcref 1.8 2.3 2.5 15 2 2.7 50 2.2 V µV/° V Vin1 Vin Idd Vreg TCvr Vpor 1.1 VDD1 VDD @ Ta=25°C VDD, 10uF ext. cap 4.7 7 4.5 5 5 5 -2.35 1.3 1.5 80 5.5 5.6 5.3 V V mA V mV/° V o o IR-chain amplifier and output driver CMIR CMRR PSSR Air δGir Voff Vnir fc IROUT IROUT IROUT IROUT IROUT IROUT 500 Vdd3V 0 1 20 10 100 50 rms-value 8 Vdd0.2 f ≤ 100kHz Rsens < 60kΩ * f ≤ 100kHz 75 55 -6.5 5500 +6.5 4 25 dB V/V % µV nV/√Hz KHz V mA µA Ω Ω pF Hz V dB dB iCref* V/V Rev 1.0 21-July-2001 -0.1 75 Vdd-3 V dB Temp-chain amplifier and output driver MLX90313 Programmable IR sensor Interface 3901090313 MLX90313 Programmable IR Sensor Interface Parameter Gain tolerance Amplifier offset Input referred white noise Chopper frequency Output voltage range Output source current Output sink current DC Output impedance, drive DC Output impedance, sink Capacitive load TEMPOUT pin Amplifier bandwidth Rel1 open drain relay driver High voltage protection output impedance Comp1 comparator Potentiometer input range ADC Input stage gain External Reference voltage Internal Reference voltage Vrefp input leakage current Resolution Monotonicity Differential non-linearity Integral non-linearity Gain error Total input-referred noise DAC Resolution Monotonicity Differential non-linearity Integral non-linearity DNL INL 8 guaranteed by design ½ ½ LSB LSB bit DNL INL full scale Vref=3V Vrefpex Vrefp Ilvrefp @150°C 12 guaranteed by design 0.4 ½ 1 0.2 LSB LSB LSB LSB 2.95 1 2.4 2.5 3 3.05 3.3 2.6 5 V/V V V uA bit IRirout IROUT 0 100 % of Vrefp Ro 32 10 V Ω Symbol δGtemp Voff Vntemp fc ORtemp Iod Ios rod ros Cmax BW TEMPOUT TEMPOUT TEMPOUT TEMPOUT TEMPOUT TEMPOUT 500 0 1 20 10 100 50 rms-value 8 Vdd0.2 Test Conditions bias current enabled Min -6.5 Typ Max +6.5 4 400 Unit % µV nV/√Hz kHz V mA uA Ω Ω pF Hz *Rsens is the impedance of the sensor connected between IRINP and IRINN for the IR-chain amplifier. **Icref is the current flowing out of pin CREF MLX90313 Programmable IR sensor Interface 3901090313 Page 3 Rev 1.0 21-July-2001 MLX90313 Programmable IR Sensor Interface 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) Supply Voltage, Vin (overvoltage) Supply Voltage, Vin1 (operating) Supply Voltage, Vin (operating) Reverse Voltage Protection Supply Current, IDD Output Current, IOUT Operating Temperature Range, TA Operating Temperature Range, TS ESD Susceptibility Rel1 output impedance 80V 6V 16V 5.5V -5V 5.6 mA 3 mA -40C to +125C -55C to +150C 2 kV 10 ohms MLX90313 Programmable IR sensor Interface 3901090313 Page 4 Rev 1.0 21-July-2001 MLX90313 Programmable IR Sensor Interface Pin-out TINP TINN IRINP IRINN VSS REL1 IROUT SDIN TOUT1 TOUT2 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 TEMPOUT CSB SDOUT SCLK TSTCLK VDD VDD1 AGND VREFP CREF Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol TINP TINN IRINP IRINN VSS REL1 IROUT SDIN TOUT1 TOUT2 CREF VREFP AGND VDD1 VDD TSTCLK SCLK SDOUT CSB TEMPOUT Description Temp-chain amplifier positive input Temp-chain amplifier negative input IR-chain amplifier positive input IR-chain amplifier negative input Supply pin Open-drain relay driver output IR-chain amplifier output SPI data input Test pin/ Oscillator output Test pin, leave open Bias current reference Reference voltage input/output Analog ground, band-gap reference voltage Automotive Ignition supply pin Regulated supply pin Clock for test mode; leave open SPI clock input SPI data output SPI chip select active low Temp-chain amplifier output MLX90313 Programmable IR sensor Interface 3901090313 Page 5 Rev 1.0 21-July-2001 MLX90313 Programmable IR Sensor Interface Pin Descriptions TINP Temperature sensor positive input pin. The pin connects to the temp-chain amplifier and the on-chip biasing current source. The source is a mirrored version of the current running into CREF with programmable ratio. The current source can be switched off for use of external current biasing. TINN Temperature sensor negative input. IRINP - IRINN Thermopile sensor input pins. VSS: Supply pin REL1 Open drain relay driver output. The typical on-resistance of this driver is