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MLX90308CCC Datasheet(PDF) 9 Page - Micro Electronics |
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MLX90308CCC Datasheet(HTML) 9 Page - Micro Electronics |
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9 / 26 page  MLX902xx Name of Sensor Rev Y.X 22/Aug/98 Page 9 MLX90308CCC Programmable Sensor Interface MLX90308CCC Programmable Sensor Interface Page 9 Rev 2.2 23/Oct/01 Analog Features Supply Regulator A bandgap-stabilized supply-regulator is on-chip while the pass-transistor is external. The bridge-type sensor is typically powered by the regulated supply (typically 4.75V). For ratiometric operation, the supply-regulator can be disabled by connecting together the unregulated and regulated supply pins. Oscillator The MLX90308 contains a programmable on-chip RC oscillator. No external components are needed to set the frequency (87.8 kHz +/-1%). The MCU- clock is generated by a PLL (phase locked loop tuned for 614 kHz or 2.46 Mhz) which locks on the basic oscillator. The frequency of the internal clock is stabilized over the full temperature range, which is divided into three regions, each region having a separate digital clock setting. All of the clock frequency programming is done by Melexis during final test of the component. The device uses the internal temperature sensor to determine which temperature range setting to use. A/D and D/A Conversions using only one DAC For saving chip area, the "Offset DAC" is multiplexed in various ways. Both "fine offset" and "digital mode" signals are stored on a capacitor. An ADC-loop is available by using a comparator and SAR. D/A Before changing to another capacitor, the DAC output should be settled to the new value. For example, MODSEL moves the analog multiplexer to the so-called "open state 0." At the same time, the 10 bit mux selects OF[9:0] for the offset-DAC. After the DAC settling time, the analog multiplexer is moved to its final state and the DAC-output is stored on a capacitor. A/D The S/W-Signal MODSEL connects the SAR-output to the DAC and the DAC-output to the comparator. The SARegister is initialized by a rising edge of STC (S/W signal). At the end of the A/D conversion, the EOC flag is set to 1 and the controller can read the ADC values. Power-On Reset The Power-On Reset (POR) initializes the state of the digital part after power up. The reset circuitry is completely internal. The chip is completely reset and fully operational 3.5 ms from the time the supply crosses 3.5 volts. The POR circuitry will issue another POR if the supply voltage goes below this threshold for 1.0 us. Test Mode For 100% testability, a "TEST" pin is provided. If the pin is pulled low, then the monitor program is entered and the chip changes its functionality. In all other applications, this pin should be pulled high or left floating (internal pull-up). Temperature Sense The temperature measurement, TPO, is generated from the external or internal temperature sensor. This is converted to a 10-bit number for use in calculating the signal compensation factors. A 2-bit coarse adjustment GNTP[1:0] is used for the temperature signal gain & offset adjustment. |
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