MLX90614ESF-BBA Melexis Inc, MLX90614ESF-BBA Datasheet - Page 10
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MLX90614ESF-BBA
Manufacturer Part Number
MLX90614ESF-BBA
Description
THERMOMETER IR DUAL 3V TO-39
Manufacturer
Melexis Inc
Datasheet
1.MLX90614ESF-BAA.pdf
(49 pages)
Specifications of MLX90614ESF-BBA
Function
Thermometer, Thermostat
Topology
ADC (Sigma Delta), Voltage Regulator
Sensor Type
Internal
Sensing Temperature
-40°C ~ 85°C
Output Type
PWM, SMBus™
Output Alarm
No
Output Fan
No
Voltage - Supply
2.4 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
TO-39
For Use With
EVB90614 - BOARD EVAL FOR MLX90614
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MLX90614ESF-BBA
Manufacturer:
Melexis Inc
Quantity:
135
Part Number:
MLX90614ESF-BBA
Manufacturer:
MELEXIS/迈来芯
Quantity:
20 000
8 Detailed description
8.1 Block diagram
8.2 Signal processing principle
The operation of the MLX90614 is controlled by an internal state machine, which controls the measurements
and calculations of the object and ambient temperatures and does the post-processing of the temperatures to
output them through the PWM output or the SMBus compatible interface.
The ASSP supports 2 IR sensors (second one not implemented in the MLX90614xAx).The output of the IR
sensors is amplified by a low noise low offset chopper amplifier with programmable gain, converted by a
Sigma Delta modulator to a single bit stream and fed to a powerful DSP for further processing. The signal is
treated by programmable (by means of EEPROM contend) FIR and IIR low pass filters for further reduction of
the band width of the input signal to achieve the desired noise performance and refresh rate. The output of
the IIR filter is the measurement result and is available in the internal RAM. 3 different cells are available:
One for the on-board temperature sensor (on chip PTAT or PTC) and 2 for the IR sensors.
Based on results of the above measurements, the corresponding ambient temperature Ta and object
temperatures To are calculated. Both calculated temperatures have a resolution of 0.01 ˚C. The data for Ta
and To can be read in two ways: Reading RAM cells dedicated for this purpose via the 2-wire interface
(0.02° C resolution, fixed ranges), or through the PWM digital output (10 bit resolution, configurable range).
In the last step of the measurement cycle, the measured Ta and To are rescaled to the desired output
resolution of the PWM) and the recalculated data is loaded in the registers of the PWM state machine, which
creates a constant frequency with a duty cycle representing the measured data.
3901090614
Rev 006
81101
90302
t°
Figure 3: Block diagram
OPA
Page 10 of 49
STATE MACHINE
ADC
Infra Red Thermometer in TO-39
DSP
Voltage
Regulator
Single and Dual Zone
PWM
September 30, 2010
Data Sheet