MLX90614_15 Datasheet, PDF (12/51 Pages) Melexis Microelectronic Systems – Single and Dual Zone Infra Red Thermometer in TO-39

MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
PWM period configuration: Period in extended PWM mode is twice the period in single PWM mode.
In single PWM mode period is T = 1.024*P [ms], where P is the number, written in bits 15…9 PWMCTRL.
Maximum period is then 131.072 ms for single and 262.144 ms for extended. These values are typical and
depend on the on-chip RC oscillator absolute value. The duty cycle must be calculated instead of working only
with the high time only in order to avoid errors from the period absolute value deviations.
The address PWMCTRL consists of control bits for configuring the PWM/SDA pin as follows:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PWM control bit meaning
0 - PWM extended mode
1 - PWM single mode
0 - PWM mode disabled (EN_PWM)
1 - PWM mode enabled (EN_PWM)
0 - SDA pin configured as Open Drain (PPODB)
1 - SDA pin configured as Push-Pull (PPODB)
0 - PWM mode selected (TRPWMB)
1 - Thermal relay mode selected (TRPWMB)
- PWM repetition number 0…62 step 2
- PWM period 1.024*ms (Single PWM mode) or 2.048*ms (Extendet PWM mode)
multiplied by the number written in this place (128 in case the number is 0)
* Values are valid for nominal HFO frequency
Table 6: PWM control bits
The address ConfigRegister1 consists of control bits for configuring the analog and digital parts:
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Config register bit meaning
1 0 0 - IIR (100%) a1=1, b1=0
1 0 1 - IIR (80%) a1=0.8, b1=0.2
1 1 0 - IIR (67%) a1=0.666, b1=0.333
1 1 1 - IIR (57%) a1=0.571, b1=0.428
0 0 0 - IIR (50%) a1=0.5, b1=0.5
0 0 1 - IIR (25%) a1=0.25, b1=0.75
0 1 0 - IIR (17%) a1=0.166(6), b1=0.83(3)
0 1 1 - IIR (13%) a1=0.125, b1=0.875
0 - Repeat sensor test "OFF"
1 - Repeat sensor test "ON"
0 0 - Ta, Tobj1
0 1 - Ta, Tobj2
1 0 - Tobj2
1 1 - Tobj1, Tobj2
0 - Single IR sensor
1 - Dual IR sensor
0 - Positive sign of Ks
1 - Negative sign of Ks
0 0 0 - FIR = 8 not recommended
0 0 1 - FIR = 16 not recommended
0 1 0 - FIR = 32 not recommended
0 1 1 - FIR = 64 not recommended
1 0 0 - FIR = 128
1 0 1 - FIR = 256
1 1 0 - FIR = 512
1 1 1 - FIR = 1024
0 0 0 - GAIN = 1 - Amplifier is bypassed
0 0 1 - GAIN = 3
0 1 0 - GAIN = 6
0 1 1 - GAIN = 12,5
1 0 0 - GAIN = 25
1 0 1 - GAIN = 50
1 1 0 - GAIN = 100
1 1 1 - GAIN = 100
0 - Positive sign of Kt2
1 - Negative sign of Kt2
0 - Enable sensor test
1 - Disable sensor test
Note: The following bits / registers should not be altered (except with special tools – contact Melexis for such
tools availability) in order to keep the factory calibration relevant:
Ke [15...0]; Config Register1 [14...11;7;3]; addresses 0x0F and 0x19.
Table 7: Configuration register 1
Check www.melexis.com for latest application notes with details on EEPROM settings.
3901090614
Rev 009
Page 12 of 52
Data Sheet
June 29, 2015