MLX90601C Datasheet, PDF (8/12 Pages) List of Unclassifed Manufacturers – SPI IR thermometer module

Datasheet MLX90601C
SPI IR thermometer module
Applications Information
Connection of the MLX90601 module into an application is straightforward. The 5V regulated supply
should be connected between pin 3 (VDD) and pin 5 (VSS). There are numerous possibilities for the I/O
of which one typical example is shown below. Here the default configuration is used. In the example a
relay is switched with the REL1 output. The threshold for this comparator is programmed in the eeprom.
This means the micro controller can change the threshold, and the MLX90601 can control the alarm
standalone. The second comparator drives the TEMPOUT pin. The SPI connection to the host
microcontroller can be a permanent connection in the application or just a means for in-circuit
programming of the device. Through this connection full access to the internal registers and configuration
settings is achieved. The SPI connection can also be used to directly read output data from the module in
digital form and process this directly in the application. An interesting feature is in-circuit programming of
the calibration constants. It is possible to change the range or emissivity, or whatever setting needs to be
user selectable.
IR sensor
MLX90313
IR+
IRINP
REL1
1
To
IR-
IRINN
OPA
A/D D/A
COMP
Thermisto
r
Rsens
TINP
Digital
MLX90247
VSS
TINN
OPA
A/D D/A
To
12 COMP
TEMPOUT
10
VCM25V
VREFP
9
CREF
VDD
3
2
Control and Support Blocks
VSS
SPI
SW1
SW2
alarm
Vref
5V
VSS
MLX90601C
SPI 4 5 6 7
Micro-controller I/O-port
390109060103
Rev. 004
Page 8 of 12
Dec/01