Omron D6T - Example Electrical Connections

D6T MEMS Thermal Sensors User’s Manual (A284) 6
6.2 Example Electrical Connections
Scenario 1: 5 V MCU Direct Connection (Same voltage as the microcontroller power supply)
Fig. 7 (a) Connecting to 5 V Microcontroller
Scenario 2: 3 V MCU (I2C port is 5 V fault tolerant)
D6T
VCC
SDA
SCL
GND
VDD
SDA
SCL
GND
MCU
R R
5V3V
Fig. 7 (b) 5 V Fault Tolerant Specification
Scenario 3: Using an I2C Level Converter
(Not a 5 V fault tolerant specification, or other devices are also connected to the 3 V I2C bus)
D6T
VCC
SDA
SCL
GND
VDD
SDA
SCL
GND
MCU
R R
I2C
Level
Translating
R R
5V
Ex. PCA9517
Fig. 7 (c) Using a Level Converter
Pull-up Resistance Values
Values will be adjusted per user calculations of specific usage conditions such
as wiring capacitance.
(Check the I2C specifications. In most cases, the range is set to approximately
3 k to 10 kΩ.)
D6T
VCC
SDA
SCL
GND
VDD5
SDA
SCL
GND
MCU
Power
circuit
5V
GND
R
R
I2C
level
converter