AS7150 datasheet(18/159 Pages) AMSOSRAM

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AS7150

Functional description

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Functional description

The AS7150 is a low-power solution for optical force sensing (OFS) signal acquisition typically

used in consumer applications for button and proximity detection. The AS7150 provides three

low-noise LED current sinks along with two 20-bit ADCs featuring true simultaneously

photodiode sampling.

The AS7150 is optimized for optical force sensing products with the following strengths:

•

Low noise, high dynamic range optical force acquisition

•

Simultaneous sampling of two photodiode channels

•

Small system size

•

Integrated 3 channel low side LED driver

•

Proximity detection function

•

Various different options for automatic offset cancellation

•

Lowest power consumption

The AS7150 AFE contains two main blocks. An analog front-end for LED driving, signal

acquisition, photodiode selection, and signal preconditioning. Moreover, a digital backend for

signal filtering, balancing, and sampling. Furthermore, the digital block will handle the sensor

configuration, control, and communication to the external MCU.

The I²C interface controls all the functions of the AS7150. All the functions can be controlled

with an external MCU via the I²C interface while AS7150 is in active mode. The following

chapters provide more detailed descriptions of all functional blocks of AS7150.

7.1

LED driver

AS7150 features two internal LED current sinks with internal multiplexers to connect three LED

inputs. The LEDs are controlled and configured via a digital sequencer to unload the host MCU

with configuration and tasks. Its configuration and assignment options are shown in chapter

7.5 Sequencer and can be configured via a convenient graphical user interface.

Each Led driver can support LED currents up to 200mA which can be controlled in 64 steps for

the different sequencers with dedicated control registers SEQ1_LED1_CURR,

SEQ2_LED1_CURR, SEQ1_LED2_CURR, SEQ2_LED2_CURR, SEQ1_LED3_CURR and

SEQ2_LED3_CURR.

AS7150 Datasheet(PDF) 18 Page - ams-OSRAM AG

AS7150 Datasheet(HTML) 18 Page - ams-OSRAM AG

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