TMD4903 datasheet(58/86 Pages) OSRAM

58 / 86 page

Datasheet, Public

Page 57

[v2-00] 2022-Nov-03

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TMD4903 − Application Information

Remote Control

General Description of RC Functionality

The TMD4903 is equipped with Remote Control functionality

which is used to generate and transmit patterns over IR for

electronic equipment (e.g. television, DVD, or audio receiver).

Virtually all protocols can be accommodated by the specialized

architecture of the Remote Control engine. The engine contains

256 bytes of pattern RAM and controls for carrier frequency,

duty cycle and pattern repetition to easily create and broadcast

a complete command waveform. The command waveform is

output on a device pin allowing direct control of an external

transistor and LED (pull-up resistor required). The integrated

LED may also be used to output the IR waveform.

Detailed Description of RC Functionality

Remote Control functionality uses a digital core that is

independent of the analog sensor operation. The logic internal

to the digital core is activated when IBEN=1. In this operational

mode the LDR pin is exclusively acquired; during this time

sensor functionality will not operate.

Most of the functional engines are controlled by dedicated

registers; however, some devices use a “shared register”

scheme. For example, this device uses address space: 0xA0 to

0xAF to also control mobeam operation. Because each

functional block serves a different purpose and utilizes

common on-chip resources, only one may be activated at a

time.

TMD4903 bảng dữ liệu(PDF) 58 Page - OSRAM GmbH