TMD4903 datasheet(73/86 Pages) OSRAM

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[v2-00] 2022-Nov-03

TMD4903 − Application Information

Figure 83:

Practical Example

Practical Example: Device registers and RAM are loaded with values to generate a real remote control waveform.

ADDRESS

T_DATA

0x01

0x22

0x23

0x32

0x24

0x05

Pattern Table

Example

1. Carrier Frequency: 38kHz (TCAR = 26us)

2. Duty Cycle = 25%

3. Non-repeat count=5 (LEDON-LEDOFF)

334-177, 22-22, 22-60, 60-22, 22-1541

4. Repeat count=2 (LEDON-LEDOFF)

334-88 22-3694

Run 2 times

5. Repeat compete pattern 3 times.

6. Delay 100us between complete patterns.

0x26

0xFE

0x05

0xFF

T_INDEX

T_DATA

334

177

1541

Time Words Table

0x01, 0x01

2C Address, Data

0x00, 0x4E

0x03, 0x00

0x02, 0xB1

0x05, 0x00

0x04, 0x16

0x07, 0x00

0x06, 0x3C

0x09, 0x06

0x08, 0x05

0x0B, 0x00

0x0A, 0x58

3694

0x0D, 0x0E

0x0C, 0x6E

START

LED ON for 344 TCAR

LED OFF for 177 TCAR

LED ON for 22 TCAR

LED OFF for 22 TCAR

LED ON for 22 TCAR

LED OFF for 60 TCAR

LED OFF for 22 TCAR

LED ON for 60 TCAR

LED OFF for 1541 TCAR

LED ON for 22 TCAR

LED OFF for 88 TCAR

LED ON for 334 TCAR

LED OFF for 3694 TCAR

LED ON for 22 TCAR

LED OFF for 88 TCAR

LED ON for 334 TCAR

LED OFF for 3694 TCAR

LED ON for 22 TCAR

LED OFF for 88 TCAR

LED ON for 334 TCAR

LED OFF for 3694 TCAR

LED ON for 22 TCAR

x01

MSB points to index 0.

Index 0 data is 334. LED

will be on for 334 X TCAR

LSB points to index 2.

Index 2 data is 22. LED

will be off for 22 X TCAR

Byte following “0xFE”

becomes the starting

address of the repeated

pattern.

STOP

x05

To run two

times, must

repeat once.

IDLE

Delay 100us

Pattern

Delay 100us

Pattern

Delay 100us

IDLE

To run

complete

pattern three

times, must

repeat twice.

Carrier Frequency:

IBT = 0x68 (26us/250ns)

Duty Cycle:

ICONFIG2 = 0x02

“Repeated sub-pattern” Repeat count=2:

ISNL = 0x01

“Complete sub-pattern” Repeat count=3:

IPNL = 0x02

Delay 100us between complete patterns:

IPOFF = 0x0A (100us/10us)

START:

Write a 0x02 to ISTART.

LEDON for 572us

LEDOFF for 96ms

Pause

Output:

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