MLX90601EZABBAXX

Datasheet SPI IR thermometer module MLX90601C Features • • • • • • Remote temperature measurement Fully linearised signals 125kb/s SPI Factory calibrated EEprom ECC Open drain relay driver output Applications • • • • Automotive climate control Toasters, microwave ovens and other appliances that require temperature control Residential, commercial climate control and occupancy detection Industrial temperature transducer and monitoring applications Ordering Information M L X 9 0 6 0 1 E Z A C X X Product Code Temperature Suffix Package Suffix Type Version Supply, i/o-Configuration and temperature ranges B C D Analog voltage output SPI serial interface PWM output Part No MLX90601 MLX90601 Temperature E E Suffix Package ZA ZA Type C C Version AA BA Description digital SPI –20/120°C 5V supply digital SPI 5/60°C 5V supply Description Functional Diagram IR+ IRRsens VSS VDD IRINP C2 IRINN TEMPOUT TINP TINN IROUT R2 R1 C4 IROUT C5 TEMPOUT C3 5V MLX90247 MLX90313 CS SCLK SDI SDO REL1 CREF VSS VREFP CS SCLK DIN DOUT REL VREF VSS/GND R3 The MLX90601C is a versatile IR thermometer module, which performs signal conditioning, linearisation and ambient temperature compensation. The module is built around the MLX90313 IR amplifier-interface, which uses high performance, chopper stabilized amplifiers, providing excellent noise performance. The sensing element is the MLX90247 discrete IR thermopile. The module is delivered factory calibrated. The SPI offers both the sensor ambient temperature and the object temperature in 12 bit digital form. Additionally the module offers several analog pins for access to the programmable comparator circuitry and the reference voltage. 390109060103 Rev. 004 Page 1 of 12 Dec/01 Datasheet SPI IR thermometer module MLX90601C ELECTRICAL CHARACTERISTICS Parameter Symbol Test Condition VDD @ Ta=25°C f ≤ 100kHz rms-value 8 IROUT IROUT IROUT IROUT IROUT 500 f ≤ 100kHz rms-value 15 TEMPOUT TEMPOUT TEMPOUT TEMPOUT 0 1 20 500 32 10 Vdd-0.2 75 400 0 1 20 Vdd-0.2 Min 4.5 1.1 75 Typ 5 5 1.3 Max 6 5.6 1.5 Unit V mA V dB Regulator and consumption Supply voltage range Vin Supply current Idd POR threshold voltage Vpor IR-chain amplifier and output driver Power supply rejection PSSR ratio Input referred white noise Vnir Chopper frequency fc Output voltage range Output source current Iod Output sink current Ios DC Output impedance, rod drive DC Output impedance, ros sink Amplifier bandwidth BW Temp-chain amplifier and output driver Power supply rejection PSSR ratio Input referred white noise Vntemp Chopper frequency fc Output voltage range ORtemp Output source current Iod Output sink current Ios AC Output impedance ro Amplifier bandwidth BW Rel1 open drain relay driver High voltage protections output impedance Ro ADC Monotonicity Differential non-linearity DNL Integral non-linearity INL Gain error Total input-referred noise DAC Resolution Monotonicity Differential non-linearity DNL Integral non-linearity INL PWM PWM Clock period Tclk PWM Total period T Leading buffer time t1 Trailing buffer time t5 Duty cycle high t2 Duty cycle low t3 Error signal t4 Rise time* 390109060103 Rev. 004 25 10 100 nV/√Hz kHz V mA uA Ω Ω Hz dB nV/√Hz kHz V mA uA Ω Hz V Ω 100 full scale Vref=3V guaranteed by design 0.4 LSB ½ LSB 1 LSB 0.2 LSB 8 bit guaranteed by design ½ LSB ½ LSB 45 92.16 50 102.4 12.5 12.5 55 112.64 µs ms % % % % % µs Dec/01 % of T % of T % of T % of T % of T 10% to 90% of Vh Page 2 of 12 0 0 25 13.3 50 50 100 Datasheet SPI IR thermometer module Parameter Fall time* Output voltage high Output voltage low *Without external loading MLX90601C Max 100 1 Symbol Vh Vl Test Condition 90% to 10% of Vh Ihigh=2mA Ilow=2mA Min 13.3 4 Typ Unit µs V V General Description MLX90601 is a versatile IR thermometer built around the MLX90247 Discrete IR thermopile sensor with on-chip PTC and the MLX90313 Programmable IR sensor interface. MLX90313 amplifies the signals coming from MLX90247 and converts them to digital by means of two high performance, low noise, chopper stabilized amplifiers and the 12-bit analog to digital converter. The digital unit on the interface then performs the ambient compensation of the IR signal. This results in two temperature signals, one representing the temperature of the object the IR sensor is pointed at (Tobject) and one representing the temperature of the sensor (Tambient). Both signals are then linearised and stored in dedicated registers, which are accessible through SPI (Tobject at register address 09h, Tambient at register address 0Ah). The REL1 output is directly connected to the open drain relay driver output of the comparator circuitry inside MLX90313. The TEMPOUT pin is connected to a pseudo push-pull output stage of the second comparator. Both comparators can act on the linearised object or ambient temperature and have programmable hysteresis values and polarity settings. Absolute Maximum Ratings Supply Voltage, VDD (overvoltage) Supply Voltage, VDD (operating) Reverse Voltage Protection Supply Current, IDD @25°C Output Current, IOUT Operating Temperature Range, TA Storage Temperature Range, TS ESD Susceptibility 80V 4.5V - 6V -5V 6 mA mA -40°C - 125°C -55°C - 150°C 4kV Pinout Pin 1 2 3 4 5 6 7 8 9 10 Symbol REL1 VSS VDD SDIN SDOUT CSB SCLK IROUT VREF TEMPOUT Description Open drain, relay driver comparator output Ground Supply pin SPI data input SPI data output SPI chip select input SPI clock input Object temperature output Reference voltage Ambient temperature output Unique Features MLX90601 is an automotive grade IR thermometer that can be fitted to any contactless temperature measurement application by means of the programmable Interfaces. The module is designed to cope with all standard qualification tests oriented towards the harsh automotive environment. If so desired, all temperature ranges and comparator settings can be adapted to the application. MLX90601 is delivered calibrated, relieving the customer of IR calibration. Detailed Description Analog Features Supply The module should be supplied directly with a nominal 5V regulated supply on pin VDD. (4.5V – 6V) The power-on reset circuitry is completely internal to MLX90313. The module is fully operational 16 ms from the time the supply 390109060103 Rev. 004 Page 3 of 12 Dec/01 Datasheet SPI IR thermometer module crosses 1.3V. The POR circuit will issue another reset if the supply voltage goes below 1.3V. MLX90601C A/D The MLX90313 on the module contains a 12-bit internal analog to digital converter. Real 12-bit conversion is achieved by a fully differential analog part of the converter. Automatic calibration is implemented in the background, which allows precise conversion in a very wide temperature range. In the second step the value of the ambient temperature is combined with the measured signal coming from the IR thermopile sensor inside MLX90247 to obtain a calculated value for the object temperature, based on the calibration data. The value is stored in a dedicated register and also available for the output electronics and SPI. Sensor Characteristics For detailed specification we refer to the datasheet on MLX90247, available from the Melexis website. In a calibrated module the linearisation unit of MLX90313 takes all characteristics of the sensor into account, including all process variations they are subject to. The TO-39 sensor housing of the thermopile has a 2.5mm diameter aperture, resulting in a 70° full angle field of view. The silicon filter used as IR-window is treated with an antireflective coating that will pass minimum 75% of IR radiation in the wave length band from 7.5µm to 13.5µm. Below 5µm, 99.5% of incoming radiation is reflected by the filter Comparators Two comparator circuits are available. Comparator 1 drives the Rel1 open drain output and is triggered by the linearised object temperature signal. The threshold level is programmed in the eeprom. Comparator 2 drives the TEMPOUT pin and is triggered by the linearised object temperature signal. The threshold level is programmed in EEPROM and can be changed through the SPI. Configuration and settings for the comparators are accessible through the SPI. For details please refer to the application note on the SPI. Linearisation Unit The linearisation unit of MLX90313 realizes 3 functions: 1. Offset measurement and calibration (offset drift compensation) 2. Measurement and offset cancellation 3. Linearisation. Linearisation proceeds in two steps. In the first step the ambient temperature is calculated from the measured signal coming from the on-chip PTC temperature sensor of MLX90247. The value is stored in a dedicated register than is available for the output electronics. CS SCLK SDI SDO C7 C6 C5 C4 C3 C2 C1 X C0 A7 C7 A6 C6 A5 C5 A4 C4 A3 C3 A2 C2 A1 C1 A0 C0 Serial Peripheral Interface (SPI) Protocol The digital interface implemented in MLX90313C is SPI compatible. It can be used to access the on-chip EEPROM and all internal registers. The chip will always work as a slave device. The format of any command is always 32 bits: 8 bits for the operation code, 8 bits for the address and 16 bits of data. The communication protocol is presented below. D15 A7 D14 A6 D13 A5 D12 A4 D11 A3 D10 A2 D9 A1 D8 A0 D7 D15 D6 D14 D5 D13 D4 D12 D3 D11 D2 D10 D1 D9 D0 D8 X X write command CS SCLK SDI SDO C7 C6 C5 C4 C3 C2 C1 X C0 A7 C7 A6 C6 A5 C5 A4 C4 A3 C3 A2 C2 A1 C1 A0 C0 X D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X read command 390109060103 Rev. 004 Page 4 of 12 Dec/01 Datasheet SPI IR thermometer module MLX90601C Every write command starts with a high to low transition of CS and ends by a low to high transition of CS after 32 periods of the serial data clock (SCLK). MLX90313C reads the data present on SDI on the rising edge of the clock. With a delay of 8 periods of the serial clock, the SPI will repeat the opcode, address and the first 8 bits of data on pin SDO. This allows the external master to check command and address and terminate the operation in case of an error by forcing CS high before the end of the complete command cycle, i.e. before the end of the 32 clock periods. The read command is build up similarly, except that no data has to be passed of course. On SDO the opcode will be followed directly by the requested data, the address is not returned in this case. The data on SDO is valid on the rising edge of the clock. In case of a read command, the SPI th will output the data on SDO starting on the 25 rising edge of the clock (after CS low) as indicated in the figure above. Timing/speed The baud-rate depends on the serial data clock (SCLK) supplied by the master controller and is limited to 125kb/s. The timing requirements are given in the figure and table below tcls tsclk tsch CS SCLK tsu thd SDI tdv SDO Symbol tsclk tcls tsch tsu thd tdv SPI timing requirements Parameter Value Sclk period min 8 CS low to SCLK high min 50 SCLK low to CS high min 50 data in setup time min 200 data in hold time min 200 data out valid min 1 Unit µs ns ns ns ns µs Below table summarizes the operations available in MLX90313C. mnem. WR RD WEPR ER REPR BLWR BLER C[7:0] Operation Codes Command X101X0XX Write internal register X10010XX Read internal register 0001XXXX Write EEprom 001XXXXX Erase EEprom X0001XXX Read EEprom 1001XXXX Block Write EEprom 101XXXXX Block erase EEprom operation codes The operation code is the first series of 8bits in a command, C[7:0] in the figure on the protocol above. Additional information on the SPI and use can be found in the application note on SPI. 390109060103 Rev. 004 Page 5 of 12 Dec/01 Datasheet SPI IR thermometer module CSB: MLX90601C Pin Descriptions REL1 Open drain relay driver output. The typical onresistance of this driver is