We use 3 pieces of ADXL357 on our PCB board. When the power is first on, three ADXL357 are normal, the DRDY pin of three pieces is set, we can get the acceleration data by SPI interface. But when the power is off and keeping a few seconds and on later, the DRDY pin of one or two pieces will be kept clear, we can’t get the acceleration data. If the power is off and keeping a few minutes and on later, the DRDY pins of three are set and we can read the data. When the temperature is below 0℃,the keeping time of off power before on again is about ten minutes, when the temperature is ordinary temperature or high temperature, the keeping time of off power before on again is less than 1 minutes.
The circuit we use is the same as figure 59 on page 21 of ADXL357 datasheet.
What’s the matter? Can you give me some advice ? Thank you.
Sorry I can not catch your points. Please note that ADXL357 need to be placed in measurement mode by clearing REG0x2D.bit0, after power on reset, it is set to 1, so it is in power standby mode after power on.