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MLX90614KSF-ABC-000-TU Datenblatt(PDF) 11 Page - Melexis Microelectronic Systems |
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MLX90614KSF-ABC-000-TU Datenblatt(HTML) 11 Page - Melexis Microelectronic Systems |
11 / 51 page MLX90614 family Single and Dual Zone Infra Red Thermometer in TO-39 3901090614 Page 11 of 52 Data Sheet Rev 009 June 29, 2015 8.3 Block description 8.3.1 Amplifier A low noise, low offset amplifier with programmable gain is used for amplifying the IR sensor voltage. By carefully designing the input modulator and balanced input impedance, the max offset of the system is 0.5µV. 8.3.2 Supply regulator and POR The module can operate from 3 different supplies: VDD = 5V MLX90614Axx VDD = 3.3V MLX90614Bxx (battery or regulated supply) VDD = 8…16V MLX90614Axx few external components are necessary please refer to “Applications information” section for information about adopting higher voltage supplies. The Power On Reset (POR) is connected to Vdd supply. The on-chip POR circuit provides an active (high) level of the POR signal when the Vdd voltage rises above approximately 0.5V and holds the entire MLX90614 in reset until the Vdd is higher than the specified POR threshold VPOR . During the time POR is active, the POR signal is available as an open drain at the PWM/SDA pin. After the MLX90614 exits the POR condition, the function programmed in EEPROM takes precedence for that pin. 8.3.3 EEPROM A limited number of addresses in the EEPROM memory can be changed by the customer. The whole EEPROM can be read through the SMBus interface. EEPROM (32X16) Name Address Write access Tomax 0x00 Yes Tomin 0x01 Yes PWMCTRL 0x02 Yes Ta range 0x03 Yes Emissivity correction coefficient 0x04 Yes Config Register1 0x05 Yes Melexis reserved 0x06 No … … … Melexis reserved 0x0D No SMBus address (LSByte only) 0x0E Yes Melexis reserved 0x0F Yes Melexis reserved 0x10 No … … … Melexis reserved 0x18 No Melexis reserved 0x19 Yes Melexis reserved 0x1A No Melexis reserved 0x1B No ID number 0x1C No ID number 0x1D No ID number 0x1E No ID number 0x1F No Table 5: EEPROM table The addresses Tomax, Tomin and Ta range are for customer dependent object and ambient temperature ranges. For details see section 8.5.3 below in this document The address Emissivity contains the object emissivity (factory default 1.0 = 0xFFFF), 16 bit. Emissivity = dec2hex[ round( 65535 x ε) ] Where dec2hex[ round( X ) ] represents decimal to hexadecimal conversion with round-off to nearest value (not truncation). In this case the physical emissivity values are ε = 0.1…1.0. Erase (write 0) must take place before write of desired data is made. |
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