MLX90614ESF-ACC Melexis Inc, MLX90614ESF-ACC Datasheet - Page 37

• Manufacturer Part Number: MLX90614ESF-ACC
• Description: INFRARED THERMOMETER
• Manufacturer: Melexis Inc

Specifications of MLX90614ESF-ACC

• 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: 4 V ~ 5.5 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: Vendor undefined / Vendor undefined
• Other names: Q4002160

11 Applications Information
11.1 Use of the MLX90614 thermometer in SMBus configuration
Error! Reference source not found. shows the connection of a MLX90614 to a SMBus with 3.3V power
supply. The MLX90614 has diode clamps SDA/SCL to Vdd so it is necessary to provide MLX90614 with
power in order not to load the SMBus lines.
11.2 Use of multiple MLX90614s in SMBus configuration
The MLX90614 supports a 7-bit slave address in EEPROM, thus allowing up to 127 devices to be read via
two common wires. With the MLX90614BBx this results in 254 object temperatures measured remotely and
an additional 127 ambient temperatures which are also available. Current source pull-ups may be preferred
with higher capacitive loading on the bus (C3 and C4 represent the lines’ parasitics), while simple resistive
pull-ups provide the obvious low cost advantage.
3901090614
Rev 006
C1
0.1uF
C2
0.1uF
Figure 35: Use of multiple MLX90614 devices in SMBus network
3
3
U1
U1
Vdd
Vdd
P W M
SDA
P W M
SDA
2
2
Vss
Vss
4
4
SCL
Vz
SCL
Vz
MLX90614Bxx
MLX90614Bxx
C1
0.1uF
1
1
Figure 34: MLX90614 SMBus connection
3
U2
Vdd
P W M
SDA
2
Vss
4
I1
Ipu1
Current source or resistor
pull-ups of the bus
SCL
Vz
MLX90614Bxx
1
Page 37 of 49
R1
I2
Ipu2
R2
SMBus
+3.3V
Infra Red Thermometer in TO-39
SDA
Vdd
SDA
SCL
GND
R1
U1
SCL
R2
Cbus2
Cbus1
SMBus
C4
C3
+3.3V
MCU
Single and Dual Zone
Vdd
SDA
SCL
GND
U1
MCU
September 30, 2010
Data Sheet