MLX90601EZABAAXX ETC1 [List of Unclassifed Manufacturers], MLX90601EZABAAXX Datasheet - Page 4

• Manufacturer Part Number: MLX90601EZABAAXX
• Description: SPI IR thermometer module
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

crosses 1.3V. The POR circuit will issue another
reset if the supply voltage goes below 1.3V.
A/D
The MLX90313 on the module contains a 12-bit
internal analog to digital converter. Real 12-bit
conversion is achieved by a fully differential
analog part of the converter. Automatic
calibration is implemented in the background,
which allows precise conversion in a very wide
temperature range.
Comparators
Two comparator circuits are available.
Comparator 1 drives the Rel1 open drain output
and is triggered by the linearised object
temperature signal. The threshold level is
programmed in the eeprom.
Comparator 2 drives the TEMPOUT pin and is
triggered by the linearised object temperature
signal. The threshold level is programmed in
EEPROM and can be changed through the SPI.
Configuration and settings for the comparators
are accessible through the SPI. For details
please refer to the application note on the SPI.
Linearisation Unit
The linearisation unit of MLX90313 realizes 3
functions:
1. Offset measurement and calibration (offset
drift compensation)
2. Measurement and offset cancellation
3. Linearisation.
Linearisation proceeds in two steps. In the first
step the ambient temperature is calculated from
the measured signal coming from the on-chip
PTC temperature sensor of MLX90247. The
value is stored in a dedicated register than is
available for the output electronics.
390109060103
Rev. 004
SCLK
SCLK
SDO
SDO
CS
SDI
SDI
CS
C7
C7
C6
C6
C5
C5
C4
C4
C3
C3
C2
C2
C1
C1
X
X
C0
C0
A7
C7
A7
C7
A6
C6
A6
C6
A5
C5
A5
C5
A4
C4
A4
C4
write command
read command
A3
C3
A3
C3
A2
C2
A2
C2
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A1
C1
A1
C1
A0
C0
A0
C0
D15
D15
A7
X
In the second step the value of the ambient
temperature is combined with the measured
signal coming from the IR thermopile sensor
inside MLX90247 to obtain a calculated value for
the object temperature, based on the calibration
data. The value is stored in a dedicated register
and also available for the output electronics and
SPI.
Sensor Characteristics
For detailed specification we refer to the
datasheet on MLX90247, available from the
Melexis website.
In a calibrated module the linearisation unit of
MLX90313 takes all characteristics of the sensor
into account, including all process variations
they are subject to.
The TO-39 sensor housing of the thermopile has
a 2.5mm diameter aperture, resulting in a 70 full
angle field of view.
The silicon filter used as IR-window is treated
with an antireflective coating that will pass
minimum 75% of IR radiation in the wave length
band from 7.5 m to 13.5 m. Below 5 m, 99.5%
of incoming radiation is reflected by the filter
Serial Peripheral Interface (SPI)
Protocol
The digital interface implemented in MLX90313C
is SPI compatible. It can be used to access the
on-chip EEPROM and all internal registers. The
chip will always work as a slave device. The
format of any command is always 32 bits: 8 bits
for the operation code, 8 bits for the address and
16 bits of data. The communication protocol is
presented below.
D14
D14
A6
Datasheet
D13
D13
A5
D12
D12
SPI IR thermometer module
A4
D11
D11
A3
D10
D10
A2
D9
A1
D9
D8
A0
D8
MLX90601C
D15
D7
D7
D14
D6
D6
D13
D5
D5
D12
D4
D4
D11
D3
D3
D10
D2
D2
D1
D9
D1
D0
D0
D8
Dec/01
X
X
X