EVB90614 Melexis Inc, EVB90614 Datasheet - Page 39

• Manufacturer Part Number: EVB90614
• Description: BOARD EVAL FOR MLX90614
• Manufacturer: Melexis Inc

Specifications of EVB90614

• Sensor Type: Temperature
• Sensing Range: -40°C ~ 125°C
• Interface: SMBus (2-Wire/I²C)
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MLX90614
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Sensitivity: -

The MLX90614 can be configured in EEPROM to operate as a thermal relay. A non contact freezing or
boiling prevention with 1 mA quiescent current can be built with two components only – the MLX90614 and a
capacitor. The PWM/SDA pin can be programmed as a push-pull or open drain NMOS, which can trigger an
external device, such as a relay (refer to electrical specifications for load capability), buzzer, RF transmitter or
a LED. This feature allows very simple thermostats to be built without the need of any MCU and zero design
overhead required for firmware development. In conjunction with a MCU, this function can operate as a
system alert that wakes up the MCU. Both object temperature and sensor die temperature can also be read
in this configuration.
11.5 High voltage source operation
As a standard, the module MLX90614Axx works with a supply voltage of 5Volt. In addition, thanks to the
integrated internal reference regulator available at pin SCL/Vz, this module can easily be powered from
higher voltage source (like VDD=8… 16V). Only a few external components as depicted in the diagram below
are required to achieve this.
With the second (synthesized Zener diode) function of the SCL/Vz pin used, the 2-wire interface function is
available only if the voltage regulator is overdriven (5V regulated power is forced to Vdd pin).
3901090614
Rev 006
J1
CON1
PWM
GND
V+
Figure 39: 12V regulator implementation
Q1
2
P W M
SDA
SCL
Vz
Vdd
1
R1
3
MLX90614
C*
Vss
Page 39 of 49
C1
U1
4
2.2uF
Infra Red Thermometer in TO-39
+12V
Equivalent schematics
R1
Q1
Single and Dual Zone
U1
5.7V
+5V
September 30, 2010
Data Sheet