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MLX90308CCC Datasheet(PDF) 10 Page - Micro Electronics |
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MLX90308CCC Datasheet(HTML) 10 Page - Micro Electronics |
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10 / 26 page  MLX90308CCC Programmable Sensor Interface MLX90308CCC Programmable Sensor Interface Page 10 Rev 2.2 23/Oct/01 Timer The clock of the timers TMI and TPI is taken directly from the main oscillator. The timers are never reloaded, so the next interrupt will take place 2x oscillator pulses after the first interrupt. Watch Dog An internal watch dog will reset the whole circuit in case of a software crash. If the watch dog counter is not reset at least once every 26 milliseconds (@ 2.46 MHz main clock), the microcontroller and all the peripherals will be reset. Firmware The MLX90308 firmware performs the signal conditioning by either of two means: analog or digital. The analog signal conditioning allows separate offset and gain temperature coefficients for up to four temperature ranges. Digital mode allows for all of the analog capabilities plus up to five different gain values based on the input signal level. Also available in both modes is the capability of range limiting and lev el steering . Temperature Processing In both analog and digital modes, the temperature reading controls the temperature compensation. This temperature reading is filtered as designated by the user. The filter adjusts the temperature reading by factoring in a portion of the previous value. This helps to minimize the effect of noise when using an external temperature sensor. The filter equation is: If measured_temp > Temp_f(n) then Temp_f(n+1) = Temp_f(n) + [measured_temp - Temp_f(n)] / [2 n_factor]. If measured_temp < Temp_f(n), then Temp_f(n+1) = Temp_f(n) - [measured_temp - Temp_f(n)] [2 n_factor]. Temp_f(n+1) = new filtered temperature value. Temp_f(n) = previous filtered temperature value. Measured_temp = Value from temperature A to D. N_factor = Filter value set by the user (four LSB’s of byte 25 of EEPROM), range 0-6. The filtered temperature value, Temp_f, is stored in RAM bytes 58 and 59. The data is a 10 bit value, left justified in a 16 bit field. Digital Features Microprocessor, LX11 Core, Interrupt Controller, Memories The LX11 microcontroller core is described in its own datasheet. As an overview, this implementation of the LX11 RISC core has following resources: Two accumulators, one index and two interrupt accumulators. 15 - 8 bit I/O ports to internal resources. 64 byte RAM. 4 kbytes ROM : 3 kbytes is available for the customer's application firmware. 1k is reserved for test. 48 x 8 bit EEPROM. Four interrupt sources, two UART interrupts and two timers. UART The serial link is a potentially full-duplex UART. It is receive-buffered, in that it can receive a second byte before a previously received byte has been read from the receiving register. However, if the first byte is not read by the time the reception of the second byte is completed, the first byte will be lost. The UART's baud rate depends on the RC-oscillator's frequency and the "TURBO"-bit (see output port). Transmitted and received data has the following structure: start bit = 0, 8 bits of data, stop bit = 1. Sending Data Writing a byte to port 1 automatically starts a transmission sequence. The TX Interrupt is set when the STOP-bit of the byte is latched on the serial line. Receiving Data Reception is initialized by a 1 to 0 transition on the serial line (i.e., a START-bit). The baud rate period (i.e., the duration of one bit) is divided into 16 phases. The first six and last seven phases of a bit are not used. The decision on the bit-value is then the result of a majority vote of phase 7, 8 and 9 (i.e., the center of the bit). Spike synchronization is avoided by de-bouncing on the incoming data and a verification of the START- bit value. The RX Interrupt is set when the stop bit is latched in the UART. |
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