APDS-9009 datasheet(6/22 Pages) BOARDCOM

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APDS-9200

Data Sheet

Figure 14 Normalized ALS Responsitivity vs. Angular

Displacement

Figure 15 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 trimming data block. The

APDS-9200 enters Standby Mode as soon as the idle state is

reached.

NOTE

As long as the I2C address has not yet been

read, 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.

ALS and UVS Operation

ALS measurements can be activated by setting the LS_EN bit

to 1 and the UVS_Mode bit to 0 in the MAIN_CTRL register.

UV measurements can be activated by setting the LS_EN bit to

1 and the UVS_Mode bit to 1 in the MAIN_CTRL register.

As soon as ALS or UVS become activated through an I2C

command, the internal support blocks are powered on. Once

the voltages and currents are settled (typically after 5 ms), the

state machine checks for trigger events from a measurement

scheduler to start the ALS or UVS conversions according to the

selected measurement repeat rates.

Once LS_EN is changed back to 0, a conversion running on the

respective channel will be completed and the relevant ADCs

and support blocks will move to standby mode.

Interrupt Features

APDS-9200 generates independent Light sensor (ALS/UVS

depend on configuration) interrupt signal that can be

multiplexed and output to the INT pad. The interrupt

conditions are always evaluated after completion of a new

conversion on the LS channels.

Light Sensor Interrupt

The LS interrupt is enabled by LS_INT_EN = 1. It can function as

either threshold triggered (LS_VAR_MODE = 0) or variance

trigged (LS_VAR_MODE = 1). The LS interrupt source generator

either uses the ALS_DATA or the UVS_DATA registers at input.

The LS interrupt source is selected by the LS_INT_SEL bits in

the INT_CFG register.

The Light Sensor threshold interrupt is enabled with

LS_INT_EN = 1 and LS_VAR_MODE = 0. It is set when the data

of the selected LS_DATA input register (ALS_DATA or

UVS_DATA) is above the upper or below the lower threshold for

a specified number of consecutive measurements.

The Light Sensor variance interrupt is enabled with

LS_INT_EN = 1 and LS_VAR_MODE = 1. It is set when the

absolute value of the difference between the previous and

current LS_DATA data value is above the decoded LS variance

threshold for a specified number of consecutive

measurements.

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.1

-90 -80 -70 -60 -50 -40 -30 -20 -10 0

10 20 30 40 50 60 70 80 90

Angle (Deg)

Start

NVM Read

Idle

Wait for OSC Power Up

Check ALS or UVS

Do UVS Conversion

Do ALS Conversion

LS_EN==0

LS_EN==1

UVS_MODE==0

LS_EN==1

UVS_MODE==1

APDS-9009 Datasheet(PDF) 6 Page - Broadcom Corporation.

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