TMD49037 datasheet(74/86 Pages) OSRAM

74 / 86 page

Datasheet, Public

Page 73

[v2-00] 2022-Nov-03

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TMD4903 − Application Information

Protocol Accommodation Checklist

The Remote Control pattern generation/transmission feature

can be configured to broadcast virtually all IR communication

protocols used for commanding consumer electronic devices.

There are many different remote control protocols currently in

use; and to meet the multitude of requirements the remote

control engine has been designed to be flexible. In general, a

protocol functions within the following transmission

specifications can be accommodated:

• Carrier periods are selectable in 250ns increments. Carrier

frequencies are in the range of 15.625 kHz to 460 kHz.

Protocols that do not use carriers can also be

accommodated.

• Duty cycle of the carrier is selectable: 50%, 37%, 25%, and

12%. Exact LED duty cycle depends on the external circuit.

• Pulse (LED on) and Gap (LED off) widths are a multiple of

carrier periods (TCAR). Pulse and Gap length is selectable

from 0 to 65535 carrier periods. Patterns with

exceptionally long pulses or gaps (I.e. longer than 65535

carrier periods) may be accommodated. This requires

setting contiguous pattern ram locations, but results in a

glitch-free long pulse/gap.

• A dedicated “time word” RAM table contains sixteen,

16-bit words which are used to set pulse and gap widths.

Simply stated, a pattern must contain sixteen or fewer

unique pulse/gap widths. Note: patterns containing more

than 16 unique pulse/gap widths may be accommodated

by using the 16-bit timewords as “building blocks” to form

longer pulse/gaps. For example, if a pattern has a

pulse/gap of both 3TCAR and 6TCAR, then only the 3TCAR

need be represented in the Time Word table; then the

6TCAR can be generated by indexing into the 3TCAR twice

(This requires the use of additional pattern RAM).

• A dedicated “pattern” RAM contains 256 bytes of data.

Each byte indexes into the Timeword table to form a

complete pulse and gap pair. A pattern that does not

contain a “repeated” sub-pattern must have 255 or fewer

pulse/gap pairs. A pattern that contains a “repeated”

sub-pattern must have 254 or fewer pulse/gap pairs, not

including the additional repetitions of the “repeated”

sub-pattern.

• Entire patterns can be reburst up to an additional 255

times and are separated by a selectable delay of 0

μs to

2.55s, in 10

μs increments.

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