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January 27, 2018
about 2 years ago
Continuing from last question I have changed how I have set up the Sensor which I am trying to communicate to via I2C.
The 2 GND pins: Set to GND coming from Microprocessor(Nucleo-F446RE)
The two 3.3 volts : Set to 3.3V wired from Microprocessor
SDA : Wired directly to Microprocessor SDA Pin that has been set up (No pullup since there is one in breakout schematic)
SCL: Wired directly to Microprocessor SCL Pin that has been set up (No pullup since there is one in breakout schematic)
CS: No connect because in breakout it "defaults" to I2C
SDI: No connect since not using SPI Interface
SDO: No connect so Slave Adress should default to 0x77 I believe?
SCK: No connect since not using SPI
I based these connections off the breakout although I could have some thought wrong?
I am looking at the SCL and SDA lines between the Microprocessor and Sensor and am seeing the SCL and SDA lines but on the 9th clock I am only seeing Nack. I have tried sending (0x77), (0x77<<1) to shift address in correct location, and tried (0x76)(0x76<<1) just to double check.
Any thoughts or ideas?
Regarding this sensor the description here says that the sensor defaults to I2C but reading through the data sheet it says that to use I2C the CS pin must be connected to power. So my question is to use I2C is it default or will I need to connect it to power?
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