MLX90614ESF-AAC MELEXIS [Melexis Microelectronic Systems], MLX90614ESF-AAC Datasheet - Page 23

• Manufacturer Part Number: MLX90614ESF-AAC
• Description: Single and Dual Zone Infra Red Thermometer in TO-39
• Manufacturer: MELEXIS [Melexis Microelectronic Systems]

PWM calculation:
Note*: The measurements with programmable filter length for FIR filter use the same EEPROM cells for N.
Note**: The IIR filter with programmable filter length uses the same EEPROM cells for L.
3901090614
Rev 003
T
T
T
D
OS
DATAcomp
T
= IIR(L
OS
Object temperature:
Recalculate the data for PWM with 10 bit resolution
Load data into PWM module
T
DATA
T
A
= IIR(L
Offset comp
Initialization
Ta
A
Offset meas
T
= meas(N
calculation
filtering
filtering
= meas(N
A
Ta
meas
= T
1
,T
Tos
DATA
DATAcomp
Gain measurement with fixed length FIR filter
Offset compensation
Additional gain filtering with fixed length IIR, storing the result into RAM as IR
Gain compensation calculation, the result is stored into RAM as K
IR1 sensor:
IR2 sensor:
,OS
Tos
-T
Ta
Ta
)
OS
)
)
)
IR sensor measurement with programmable length FIR filter *.
Offset compensation
Gain compensation
Filtering with programmable length IIR filter**, storing the result into RAM as IR1
Calculation of the object temperature. The result is available in RAM as T
IR sensor measurement with programmable length FIR filter *.
Offset compensation
Gain compensation
Filtering with programmable length IIR filter**, storing the result into RAM as IR2
Calculation of the object temperature. The result is available in RAM as T
IR
IR
IR
OS
IR
OS
IR Offset meas
G
Gcomp
K
Gm
= IIR(L
Offset comp
IR
= IIR(L
G
Gain drift
= meas(N
= meas(N
calculation
filtering
filtering
= IR
2
1
G
IRos
Gm
,IR
Figure 15: Software flow
- IR
,OS
Gcomp
IRos
IRg
OS
IR
)
Page 23 of 40
)
)
)
IR1
IR1
IR1
Infra Red Thermometer in TO-39
IR1
T
Dcomp
OBJ1
D
Dg
Offset comp
Gain comp
= IIR(L
IR1 meas
D
= IR1
= meas(N
filtering
MLX90614 family
calculation
= IR1
2
3
Dcomp
IR
,IR1
D
- IR
IR
*K
Dg
)
OS
G
)
Single and Dual Zone
G
IR2
Load PWM registers
IR2
IR2
IR2
PWM calculation
T
Dcomp
OBJ2
D
Offset comp
Dg
Gain comp
= IIR(L
D
IR2 meas
= IR2
= meas(N
filtering
G
calculation
= IR2
.
3
Data Sheet
03/Oct/2007
Dcomp
IR
OBJ1
OBJ2
,IR2
D
- IR
IR
*K
Dg
)
.
.
OS
G
)
D
D
.