MLX90616 Datasheet, PDF (9/36 Pages) Melexis Microelectronic Systems – Infra Red Thermometer in TO-39 for high temperature thermometer guns

MLX90616ESF-HCA
Infra Red Thermometer in TO-39
for high temperature thermometer guns
8.3.2 Supply regulator and POR
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
MLX90616 in reset until the Vdd is higher than the specified POR threshold V_POR. During the time POR is
active, the POR signal is available as an open drain at the PWM/SDA pin. After the MLX90616 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
Tomax
Tomin
PWMCTRL
0x000
0x001
0x002
Ta range
0x003
Emissivity correction
coefficient
0x004
Config Register1
0x005
Calibration coefficients
0x006
…
…
Calibration coefficients
0x00D
SMBus address
0x00E
Calibration coefficients
0x00F
Calibration coefficients
0x010
…
…
Calibration coefficients
0x018
Config Register2
0x019
Melexis reserved
0x01A
Melexis reserved
0x01B
ID number
0x01C
ID number
0x01D
ID number
0x01E
ID number
0x01F
Write access
Yes
Yes
Yes
Yes
Yes
Yes
Calibration mode
…
Calibration mode
Yes
Yes
Calibration mode
…
Calibration mode
Yes
No
No
No
No
No
No
Table 4: EEPROM table
The addresses To_max, To_min and Ta range are for customer dependent object and ambient temperature
ranges. For details see section 8.5.2 below in this document
The address Emissivity contains the object emissivity (factory default 1.0 = 0xFFFF), 16 bit.
ε Emissivity = dec2hex[ round( 65535 x ) ]
Where dec2hex[ round( X ) ] represents decimal to hexadecimal conversion with round-off to nearest value
ε (not truncation). In this case the physical emissivity values are = 0.1…1.0.
Erase (write 0) must take place before write of desired data is made.
3901090616
Rev 002
Page 9 of 36
Data Sheet
August 20, 2012