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MLX90614KSF-BAF-000-TU Scheda tecnica(PDF) 11 Page - Melexis Microelectronic Systems

Il numero della parte MLX90614KSF-BAF-000-TU
Spiegazioni elettronici  Single and Dual Zone Infra Red Thermometer in TO-39
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Produttore elettronici  MELEXIS [Melexis Microelectronic Systems]
Homepage  http://www.melexis.com
Logo MELEXIS - Melexis Microelectronic Systems

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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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