MLX90616 Datasheet, PDF (29/36 Pages) Melexis Microelectronic Systems – Infra Red Thermometer in TO-39 for high temperature thermometer guns

MLX90616ESF-HCA
Infra Red Thermometer in TO-39
for high temperature thermometer guns
11 Applications Information
11.1 Use of the MLX90616 thermometer in SMBus configuration
+3.3V
R1 R2
2
PWM
SDA
Vdd
3
SCL ¹
Vz
C1 U2
0.1uF
Vss
4 ^MLX90614Bxx
SMBus
U1
Vdd
SDA
SCL
GND
MCU
Figure 20: MLX90616 SMBus connection
Figure 20 shows the connection of a MLX90616 to a SMBus with 3.3V power supply. The MLX90616 has
diode clamps SDA/SCL to Vdd so it is necessary to provide MLX90616 with power in order not to load the
SMBus lines.
11.2 Use of multiple MLX90616s in SMBus configuration
+3.3V
I1
I2
R1
2
PWM
SDA
Vdd
3
SCL ¹
Vz
C1 U1
0.1uF
Vss
4 ^MLX90614Bxx
Ipu1
Ipu2
Current source or resistor
pull-ups of the bus
R2
SMBus
U1
Vdd
SDA
SCL
GND
MCU
2
PWM
SDA
Vdd
3
SCL ¹
Vz
C2 U1
0.1uF
Vss
4 ^MLX90614Bxx
C3
Cbus1
Cbus2
C4
SDA SCL
Figure 21: Use of multiple MLX90616 devices in SMBus network
The MLX90616 supports a 7-bit slave address in EEPROM, thus allowing up to 127 devices to be read via
two common wires. 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.
3901090616
Rev 002
Page 29 of 36
Data Sheet
August 20, 2012