TMD4903 Datasheet, PDF (57/86 Pages) ams AG – Color and Proximity Sensor Module with mobeam

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.
ams Datasheet
[v1-12] 2015-May-14
Page 57
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