MLX90614ESF-AAC MELEXIS [Melexis Microelectronic Systems], MLX90614ESF-AAC Datasheet - Page 11

• Manufacturer Part Number: MLX90614ESF-AAC
• Description: Single and Dual Zone Infra Red Thermometer in TO-39
• Manufacturer: MELEXIS [Melexis Microelectronic Systems]

8.3 Block description
8.3.1 Amplifier
A low noise low offset amplifier with programmable gain is implemented for amplification of the IR sensor
voltage. With a carefully designed input modulator and balanced input impedance, an offset as low as 0.5µV
is achieved.
8.3.2 Supply regulator and POR
The module can operate from 2 different supplies:
VDD= 5V => MLX90614Axx
VDD=3.3V => MLX90614Bxx (battery or regulated supply)
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
MLX90614xxx in reset until the Vdd is higher than the specified POR threshold V
different for MLX90614Axx and MLX90614Bxx). During the time POR is active, the POR signal is available as
an open drain (active high) at the PWM/SDA pin. After the MLX90614xxx 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 via SMBus interface.
The addresses To
ranges. For details see point 8.5.3 below in this document
The address Emissivity contains the object em sivity (factory default 1.0 = 0xFFFF), 16 bit.
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
3901090614
Rev 003
Emissivity = dec2hex[ round( 65535 x
To
To
PWMCTRL
Ta range
Emissivity correction coefficient
Config Register1
SMBus address
max
min
max
, To
min
and Ta range are for customer dependent object and ambient temperature
ID number
ID number
ID number
ID number
Name
EEPROM (32X16)
ε
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is
) ]
Melexis reserved
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Melexis reserved
Infra Red Thermometer in TO-39
ε
…
…
= 0.1…1.0.
MLX90614 family
Address
00Dh
01Ah
01Bh
01Ch
01Dh
000h
001h
002h
003h
004h
005h
006h
00Eh
00Fh
010h
019h
01Eh
01Fh
018
…
…
Single and Dual Zone
Write acces
POR
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
…
…
(note that this level is
Data Sheet
03/Oct/2007