MLX90614_15 Datasheet, PDF (21/51 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
8.5 PWM
The MLX90614 can be read via PWM or SMBus compatible interface. Selection of PWM output is done
in EEPROM configuration (factory default is SMBus). PWM output has two programmable formats, single and
dual data transmission, providing single wire reading of two temperatures (dual zone object or object and
ambient). The PWM period is derived from the on-chip oscillator and is programmable.
Config Register[5:4]
00
01
11
10*
PWM1 data
T_A
T_A
T_O1
T_O2
PWM2 data
T_O1
T_O2
T_O2
Undefined
Tmin,1
T_{A_range},L
T_{A_range},L
T_{O_MIN}
T_{O_MIN}
Tmax,1
T_{A_range},H
T_{A_range},H
T_{O_MAX}
T_{O_MAX}
Tmin,2
T_{O_MIN}
T_{O_MIN}
T_{O_MIN}
N.A.
Tmax,2
T_{O_MAX}
T_{O_MAX}
T_{O_MAX}
N.A.
Table 12: PMW configuration table
Note: Serial data functions (2-wire / PWM) are multiplexed with a thermal relay function (described in the
“Thermal relay” section).
* Not recommended for extended PWM format operation
t3
Error band
Start
t1
Valid data band
t2
Stop
t4
0
1
8
T
t3
Error band
Sensor 1
Valid data band
Start
Sensor 1
t1
t2
Stop
t4 t5
5
8
T
13
16
T
7
8
T
T
t7
Error band
Sensor 2
Valid data band
Sensor 2
t6
t8
0
1
16
T
5
16
T
7
16
T
8
16
T
9
16
T
13
16
T
15
16
T
T
Figure 14: PWM timing single (above) and extended PWM (bellow)
PWM type
Single
Extended - S1
Extended - S2
t1
1/8 – high
1/16 - high
1/16 - high
t2
4/8 - var
4/16 - var
4/16 - high
t3
2/8
2/16
2/16 - high
t4
1/8 – low
1/16 - low
1/16 - high
t5
NA
1/16 - low
1/16 - high
t6
NA
4/16 – low
4/16 - var
Table 13: PMW timing
t7
NA
2/16 - low
2/16
t8
NA
1/16 - low
1/16 - low
3901090614
Rev 009
Page 21 of 52
Data Sheet
June 29, 2015