LSM303DLHC DRDY Behaviour

[tom2399]

Posted on April 13, 2017 at 12:58

The detailed behaviour of the LSM303DLHC DRDY pin (pin 9) is not elaborated upon in the datasheet.

We have observed that it generates active low pulse but this is not detailed in the datasheet. 

What are the timing requirements on responding to DRDY?

At which point during this low pulse are the registers ready to be read?

Should the DRDY bit in register SR_REG_M be read to verify that a new set of measurements is ready, or is just using the DRDY pin sufficient?

[Miroslav BATEK]

Posted on April 13, 2017 at 14:24

The behavior of the DRDY signal in this sensor is atypical. The DRDY signal is low when new data are written to the output registers. So the data should be read when the DRDY signal is high. I think the best solution is synchronize reading of output data by rising edge of the DRDY signal.