MLX90614ESF-AAB ETC2 [List of Unclassifed Manufacturers], MLX90614ESF-AAB Datasheet - Page 20

• Manufacturer Part Number: MLX90614ESF-AAB
• Description: Single and Dual Zone
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

8.5.3 Customizing the temperature range for PWM output
The calculated ambient and object temperatures are stored in RAM with a resolution of 0.01 °C (16 bit). The
PWM operates with a 10-bit word so the transmitted temperature is rescaled in order to fit in the desired
range.
For this goal 2 cells in EEPROM are foreseen to store the desired range for To (To
Ta (Ta
Thus the output range for To can be programmed with an accuracy of 0.01 °C, while the corresponding Ta
range can be programmed with an accuracy of 2.56 °C.
The object data for PWM is rescaled according to the following equation:
The T
result is a 10-bit word, in which 000h corresponds to To
corresponds to
The ambient data for PWM is rescaled according to the following equation:
The result is a 10-bit word, where 000h corresponds to -38.2 °C (lowest Ta that can be read via PWM), 3FFh
corresponds to 125 °C (highest Ta that can be read via PWM) and 1LSB corresponds to
3901090614
Rev 003
T
T
T
T
T
T
PWM
MIN
MAX
PWM
MIN
MAX
EEPORM
EEPORM
obj
EEPORM
ambient
EEPORM
RAM
range
=
is the linearized Tobj, 16-bit (0000…FFFFh, 0000 for -273.15°C and FFFFh for +382.2°C) and the
T
=
: the 8MSB are foreseen for Ta
=
=
=
=
RAM
T
T
[
T
[
T
RAM
T
MIN
K
MAX
MIN
MAX
−
To
K
PWM
T
−
∗
PWM
MAX
∗
−
MIN
100
−
T
obj
100
1023
(
MIN
−
(
ambient
EEPROM
−
−
38
LSB
EEPROM
38
LSB
To
2 .
2 .
,
MIN
)
K
]
)
,
]
∗
PWM
K
∗
[°C]
100
64
100
PWM
64
obj
LSB
ambient
=
LSB
T
max
MAX
=
and the 8LSB for Ta
EEPROM
T
MAX
Page 20 of 40
1023
EEPROM
−
T
1023
MIN
MIN
−
EEPROM
T
[°C], 3FFh corresponds to To
MIN
Infra Red Thermometer in TO-39
EEPROM
min
MLX90614 family
).
Single and Dual Zone
min
and To
MAX
T
[°C] and 1LSB
MAX
1023
max
−
Data Sheet
03/Oct/2007
) and one for
T
MIN
[°C]