4/9

2004-09-06

IR TV/VCD TRANSMITTER

IR CONTROL IC

一華半導體股份有限公司

MOSDESIGN SEMICONDUCTOR CORP.

IR CONTROL

M3014

Table 1：Pulse Train Timing

Mode

T

O ( ms )

tp ( μs )

t

M ( μ s )

t

ML ( μ s )

t

MH ( μ s)

t

W ( ms )

Flashed

2.53

8.8

─

─

─

121

Modulated

2.53

─

26.4

17.6

8.8

121

Fosc

455KHz

t

OSC = 2.2 μs

tp

4 x t

OSC

Flashed pulse width

t

M

12 x t

OSC

Modulation period

t

ML

8 x t

OSC

Modulation period low

t

MH

4 x t

OSC

Modulation period high

t

W

55296 x t

OSC

Word distance

T

O

1152 x t

OSC

Basic unit of pulse distance

The following number of pulses may be selected by Metal option：N = 8 , 12 , 16.

Note：The different dividing ratio for To and t

W between flash mode and carrier mode is obtained by changing the module of a

particular divider by 3 during flash mode to divide by 4 during carrier mode. This allows the use of a 600KHz ceramic

resonator during carrier mode to obtain a better noise immunity for the receiver without a significant change in To and t

W.

For first samples, the correct divider ration is obtained by a metal mask option. For final parts, this is automatically done

together with the selection of flash- / carrier mode.

Table 2：Pulse Train Separation ( tb )

Code

tb

Logic “ 0 “

2 x To

Logic “ 1 “

3 x To

Toggle bit time

2 x To or 3 x To

Reference time

3 x To

Table 3：Transmission mode and sub-system address selection. The sub-system address and the transmission mode are defined by

connecting the ADRM input to one or more driver outputs ( R0 to R6 ) of the key matrix. If more than one driver is

connected to ADRM, they must be decoupled by diodes.

Sub-system address

Driver R0 ~ R6

Mode

#

S2

S1

S0

0

1

2

3

4

5

6

0

1

1

1

O

1

0

0

0

O

O

2

0

0

1

O

O

3

0

1

0

O

O

4

0

1

1

O

O

5

1

0

0

O

O

Flashed

6

1

0

1

O

O

0

1

1

1

1

0

0

0

O

2

0

0

1

O

3

0

1

0

O

4

0

1

1

O

5

1

0

0

O

Modulated

6

1

0

1

O

O = Connected to ADRM

Blank = not Connected to ADRM