MLX90616 Datasheet, PDF (20/36 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
8.5 PWM
The MLX90616 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
11
PWM1 data
Ta
Undefined
Undefined
T_obj1
PWM2 data
T_obj
Undefined
Undefined
T_obj2
Tmin,1
Ta_range,L
N.A.
N.A.
To_min
Tmax,1
Ta_range,H
N.A.
N.A.
To_max
Tmin,2
To_min
N.A.
N.A.
To_min
Tmax,2
To_max
N.A.
N.A.
To_max
Table 10: 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 12: PWM timing single (above) and extended PWM (below)
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
t7
NA
2/16 - low
2/16
Table 11: PMW timing
t8
NA
1/16 - low
1/16 - low
3901090616
Rev 002
Page 20 of 36
Data Sheet
August 20, 2012