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APDS-9306-065 Datasheet(PDF) 7 Page - AVAGO TECHNOLOGIES LIMITED

Part # APDS-9306-065
Description  Miniature Surface-Mount Digital Ambient Light Sensor
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Manufacturer  AVAGO [AVAGO TECHNOLOGIES LIMITED]
Direct Link  http://www.avagotech.com
Logo AVAGO - AVAGO TECHNOLOGIES LIMITED

APDS-9306-065 Datasheet(HTML) 7 Page - AVAGO TECHNOLOGIES LIMITED

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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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