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APDS-9306-065 Datasheet(PDF) 7 Page - AVAGO TECHNOLOGIES LIMITED |
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APDS-9306-065 Datasheet(HTML) 7 Page - AVAGO TECHNOLOGIES LIMITED |
7 / 21 page 7 System State Machine Start Up after Power-On or Software Reset The main state machine is set to “Start State” during power-on or software reset. As soon as the reset is released, the internal oscillator is started and the programmed I2C address and the trim values are read from the internal non volatile memory (NVM) trimming data block. The device enters Standby Mode as soon as the Idle State is reached. Note: As long as the I2C address has not yet been reached, the device will respond with NACK to any I2C command and ignore any request to avoid responding to a wrong I2C address. Standby Mode Standby Mode is the default mode after power-up. In this state, the oscillator, all internal support blocks, and the ADCs are switched off but I2C communication is fully supported. Ambient Light Sensor Operation ALS measurements can be activated by setting the ALS_ EN bit to 1 in the MAIN_CTRL register. As soon as the ALS becomes activated through an I2C command, the internal support blocks are powered on. Once the voltages and currents are settled (typically after 5ms), the state machine checks for trigger events from a measurement scheduler to start the ALS conversions according to the selected measurement repeat rates. Once ALS_EN is changed back to 0, a conversation running on the respective channel will be completed and the relevant ADCs and support blocks will move to standby mode. Start Fuse Read Idle Wait for OSC Power Up Check ALS Do ALS Conversion (ADC ms) ALS_EN==0 ALS_EN==1 ALS_EN==1 Priority 1 Priority 2 Ambient Light Sensor Interrupt The ALS interrupt is enabled by ALS_INT_EN=1 and can function as either threshold triggered (ALS_VAR_ MODE=0) or variance triggered (ALS_VAR_MODE =1). The ALS threshold interrupt is enabled with ALS_INT_ EN=1 and ALS_VAR_MODE=0. It is set when the ALS data is above the upper or below the lower ALS threshold for a specified number of consecutive measurements (1+ALS_ PERSIST) The ALS variance interrupt is enabled with ALS_INT_EN=1 and ALS_VAR_MODE=1. It is set when the absolute value of the difference between previous and current ALS data is above the decoded ALS variance threshold for a specified number of consecutive measurements (1+ALS_PERSIST). |
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