MLX90614ESF-DCA Melexis Inc, MLX90614ESF-DCA Datasheet - Page 38

• Manufacturer Part Number: MLX90614ESF-DCA
• Description: IC THERMOMETER IR SGL 3V TO-39
• Manufacturer: Melexis Inc

Specifications of MLX90614ESF-DCA

• 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: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Through Hole
• Package / Case: TO-39-3, TO-205AD, Metal Can
• For Use With: EVB90614 - BOARD EVAL FOR MLX90614
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

11.3 PWM output operation
Using the PWM output mode of the MLX90614 is very simple, as shown in Figure 36.
The PWM mode is free-running after POR when configured in EEPROM. The SCL pin must be forced high
for PWM mode operation (can be shorted to V
A pull-up resistor can be used to preserve the option for SMBus operation while having PWM as a default as
is shown on Figure 37.
Again, the PWM mode needs to be written as the POR default in EEPROM. Then for PWM operation the
SCL line can be high impedance, forced high, or even not connected. The pull-up resistor R1 will ensure
there is a high level on the SCL pin and the PWM POR default will be active. SMBus is still available (for
example – for further reconfiguration of the MLX90614, or sleep mode power management) as there are pull-
up resistors on the SMBus lines anyway.
PWM can be configured as open drain NMOS or a push-pull output. In the case of open drain external pull-up
will be needed. This allows cheap level conversion to lower logic high voltage. Internal pull-ups present in
many MCUs can also be used.
11.4 Thermal alert / thermostat
3901090614
Rev 006
+5V
C1
0.1uF
3
U1
Vdd
P WM
SDA
2
Vss
4
SCL
Vz
MLX90614Axx
1
-
+
D1
Alert dev ice
Figure 38: Thermal alert/thermostat applications of MLX90614
Figure 36: Connection of MLX90614 for PWM output mode
Figure 37: PWM output with SMBus available
C1
0.1uF
3
U1
Vdd
PW M
SDA
2
Vss
J1
CON1
PWM/SDA
4
J1
CON1
SCL
Vz
MLX90614Bxx
PWM
GND
Vdd
GND
1
SCL
Vdd
DD
Page 38 of 49
R1
pin).
C1
2
C1
R2
PW M
SDA
2
SMBus
0.1uF
PW M
SDA
+3.3V
0.1uF
SCL
Vz
Vdd
1
3
SCL
Vz
Vdd
1
3
Vdd
SDA
SCL
GND
Vss
R1
10k
Vss
U1
MLX90614
Infra Red Thermometer in TO-39
U1
MLX90614
U1
MCU
Single and Dual Zone
AC line
U2
10uF
C2
September 30, 2010
C3
0.1uF
R2
3
Vdd
P WM
SDA
2
Vss
4
SCL
Vz
Data Sheet
+24V
1
Q1
R1
C*