MLX90614ESF-AAC MELEXIS [Melexis Microelectronic Systems], MLX90614ESF-AAC Datasheet - Page 18

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MLX90614ESF-AAC

Manufacturer Part Number
MLX90614ESF-AAC
Description
Single and Dual Zone Infra Red Thermometer in TO-39
Manufacturer
MELEXIS [Melexis Microelectronic Systems]
Datasheet
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.
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
8.5.1 Single PWM format
In single PWM output mode the settings for PWM1 data only are used. The temperature reading can be
calculated from the signal timing as:
where Tmin and Tmax are the corresponding rescale coefficients in EEPROM for the selected temperature
output (Ta, object temperature range is valid for both Tobj1 and Tobj2 as specified in the previous table) and
T is the PWM period. Tout is T
3901090614
Rev 003
Config Register[5:4]
t
t
1
Start buffer
1
10*
00
01
11
t
t
2
2T, data 1 transmission
2
T
t
t
3
3
PWM1 data
obj1
T
T
Single PWM output format (4 periods)
Ta
Ta
obj1
obj2
, T
Tout
Extended PWM output format
obj2
or T
=
T
Data band
PWM2 data
⎢ ⎣
Undefined
Figure 11: PWM timing
a
2
T
according to Config Register [5:4] settings.
t
2
T
T
T
Page 18 of 40
obj1
obj2
obj2
*
(
Tmax
Tmin
Ta
Ta
Tmin,1
To
To
Infra Red Thermometer in TO-39
range
range
Error signaling band
min
min
2T, data 2 transmission
)
⎥ ⎦
,L
,L
T
MLX90614 family
t
4
+
Tmin
Ta
Ta
Tmax,1
To
To
range
range
,
max
max
Single and Dual Zone
,H
,H
Tmin,2
To
To
To
N.A.
t
5
min
min
min
T
End buffer
Data Sheet
03/Oct/2007
Tmax,2
To
To
To
N.A.
max
max
max

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