E909-05 Datasheet, PDF(18/67 Page) ELMOS Semiconductor AG – The HALIOS® multi purpose optical sensor is based on an optical bridge which provides a contactless detec-tion of gestures (e.g. movement of a finger).

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E909-05 Datasheet, PDF (18/67 Pages) ELMOS Semiconductor AG – The HALIOS® multi purpose optical sensor is based on an optical bridge which provides a contactless detec-tion of gestures (e.g. movement of a finger).

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HALIOSÂ® MULTI-PURPOSE OPTICAL SENSOR WITH HIGH LIGHT IMMUNITY

E909.05

PRELIMINARY INFORMATION AUG 02, 2011

5.6 HALIOS Interface

5.6.1 Block Diagram

LED1

LED2

LED3

LED4

LEDC

analog

demod.

digital

clk

rst

DAC

clocks

10 bit

counter

current

control

DAC

offset

5 range

range

adr

din

dout

DAC

offset ledc

5 config

Figure 5.6.1-1 Block Diagram

5.6.2 Features

The ASIC contains a configurable HALIOS interface. It is possible to drive up to four sending LEDs and one

compensation LED. The HALIOS measurement loop is closed by a 10 bit DAC which regulates the output

current for the sending/compensation LED. The DAC is controlled by a counter that sets the DAC dependent

on the received signal amplitudes up or down. To follow fast signal changes the counter can be increased or

decreased by 1, 2, 4 or 8 steps, this is called the step size that is set due to the number of up/down-counts in

the same direction. To start a new measurement the interface is configured with the counter-value and the

step size (generally the values from the last measurement), the LED configuration and the current configura-

tion for the LED driver. The measurement regulates the DAC and performs 25 counter steps to follow the

actual reflection conditions of the sensor. After one measurement the interface returns the counter-value, the

mean-value (it is calculated from the last 16 counter-steps during one measurement) and the step size from

the last integrator cycle. After the automated measurement cycle is finished an interrupt appears if the inter-

rupt is enabled. The interrupt is used to wake the system from standby mode..

5.6.3 HALIOS Module Registers

address offset

reset value

size

0x00

0x0000

Start Value Counter

0x02

0x0000

Measurement Configuration

0x04

0x0000

Current Configuration phase A

0x06

0x0000

Current Configuration phase B

This document contains information on a pre-production product. ELMOS Semiconductor AG reserves the right to change specifications and information herein without notice.

ELMOS Semiconductor AG

Data Sheet 18 / 67

QM-No.: 25DS0014E.00

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