E909-05 Datasheet, PDF (14/67 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).

HALIOS® MULTI-PURPOSE OPTICAL SENSOR WITH HIGH LIGHT IMMUNITY
E909.05
PRELIMINARY INFORMATION AUG 02, 2011
5.2 Supply voltages
5.2.1 Block Diagram
VDDI
VSSI
Peripherie
RAM
DVDD
DVSS
GPIO
Interface
Flash
EL16 Core
AVDD
AVSS
CRG
Analog
LED1-4
LEDVSS
Figure 5.2.1-1 Block Diagram of Power Supply
5.2.2 Functional Description
Three separate power supplies are needed to operate the ASIC. The core voltage supplying all digital blocks,
the analog parts needed for the oscillator and supply observation as well as the preamplifiers of the output
pads and the IO supply which powers the post drivers of the GPIO pads. The third supply is used for the
HALIOS measurement analog part. In the figure above the different power supply regions are depicted.
5.2.3 Power Up Sequence Considerations
During power-up the power-on-reset configures all pads as inputs consequently disabling the output drivers.
The IO supply is watched after power up if the core supply is in the specified range and causes a reset if it
leaves the allowed region. The core supply is watched via a brown out circuit.
The pads will remain input pads as long as the software does not reconfigure them.
According the following diagram it must be guaranteed that ADVV / DVVC is not switched on before VDDIO.
NRST can be switched on if the VDDIO and AVDD/DVVC are stabilized on its potential.
A >= 0ms
B > 5ms (recommended)
To avoid floating gates, A < 100µs is recommended.
Fig. 5.2.3-1: Power Up Sequence: A >= 0 ms; B > 5 ms
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 14 / 67
QM-No.: 25DS0014E.00