APDS-9190 datasheet(2/24 Pages) AVAGO

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Functional Block Diagram

Upper Threshold

Lower Threshold

Interrupt

Control

Logic

Prox

Detect

ADC

Data

INT

SCL

SDA

VDD

GND

LDR

LED K

LED A

Prox IR LED

Ch0

Ch1

LED Regulated

Constant Current

Sink

Detailed Description

The APDS-9190 light-to-digital device provides on-chip

Ch0 and CH1 diodes, integrating amplifiers, ADCs, accu-

mulators, clocks, buffers, comparators, a state machine

and an I2C interface. Each device combines one Ch0

photodiode (visible plus infrared) and one infrared-

responding (IR) photodiode. Two integrating ADCs simul-

taneously convert the amplified photodiode currents to a

digital value providing up to 16-bits of resolution. Upon

completion of the conversion cycle, the conversion result

is transferred to the Ch0 and IR data registers. This digital

output can be read by a microprocessor.

Communication to the device is accomplished through a

fast (up to 400 kHz), two-wire I2C serial bus for easy con-

nection to a microcontroller or embedded controller. The

digital output of the APDS-9190 device is inherently more

immune to noise when compared to an analog interface.

The APDS-9190 provides a separate pin for level-style in-

terrupts. When interrupts are enabled and a pre-set value

is exceeded, the interrupt pin is asserted and remains

asserted until cleared by the controlling firmware.

The interrupt feature simplifies and improves system

efficiency by eliminating the need to poll a sensor for a

proximity value. An interrupt is generated when the value

of proximity conversion exceeds either an upper or lower

threshold. Additionally, a programmable interrupt per-

sistence feature allows the user to determine how many

consecutive exceeded thresholds are necessary to trigger

an interrupt. Interrupt thresholds and persistence settings

are configured independently for proximity.

Proximity detection is fully provided with an 850 nm IR

LED. An internal LED driver (LDR) pin, is jumper connected

to the LED cathode (LED K) to provide a factory calibrated

proximity of 100 +/- 20 mm. This is accomplished with a

proprietary current calibration technique that accounts

for all variances in silicon, optics, package and most impor-

tantly IR LED output power. This will eliminate or greatly

reduce the need for factory calibration that is required

for most discrete proximity sensor solutions. While the

APDS-9190 is factory calibrated at a given pulse count,

the number of proximity LED pulses can be programmed

from 1 to 255 pulses, which will allow greater proximity

distances to be achieved. Each pulse has a 16

µs period.

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