STV2249 datasheet(57/86 Pages) STMICROELECTRONICS

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STV224X, STV228X, STV223X - I²C BUS SPECIFICATION COMPATIBILITY

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7 I²C BUS SPECIFICATION COMPATIBILITY

The STV2246H/36H, 2286H, 2247H/37H, 2248H/

38H and 2249H/39H I²C bus specification is com-

patible between IC version. However, some dedi-

cated settings must be used for the different ver-

sions. The following sections show the differences

between the various versions. An “X” means that

the function is available and can be set to “1” or

“0”.

Note 1: The FBEXT pin must be connected to ground.

CAUTION: The specification of WR04 d3:2 has changed.

For 224XC versions (refer to STV224XC datasheet), WR04 d3:2 = 11 (bin.) means that FM demod de-

emphasis is bypassed. This function is used for BTSC application compatibility.

For 224XD/XE versions, WR04 d3:2 = 11: NOT TO BE USED.

For 224XH versions, WR04 d3:2 = 11 (bin.) means that Audio FM Wide mode is selected and it must be

used in QSS applications only. In this case, the following registers must be programmed:

WR04 d3:2 = 11 (bin.) (Audio FM Wide mode)

WR06 d6 = 0 (QSS application)

WR1F d5:4 = 1x (bin.) (AVL ON)

CAUTION: The specification of WR07 d6 has changed.

For 224XC/224XD versions, WR07 d6 = 1 means “insertion of cut-off pulses after a vertical oversize

blanking”

For 224XE/XH versions, WR07 d6 = 1 means “RGB peak limitation”

CAUTION: The specification of WR0F d5 has changed.

The new specification is:

WR0F d5 = 0: trap and luma delay active; this is not changed

WR0F d5 = 1: trap and luma delay disabled (bypass); this is changed

2248H/38H 2249H/39H 2247H/37H 2246H/36H

2286H

RGBext

WR0A d7:6

011

L/L' mode

WR01 d5

0000

Positive/Negative Modulation

WR01 d4

0000

FM/AM Output Selection

WR04 d5

0000

Bell Filter

WR11 d4:0

00000

QSS/Intercarrier Application

WR06 d6

QSS and AM defeat

WR04 d6

AGC SIF Time Constant

WR06 d3 & WR1E d4

CVBSout amplitude

WR02 d4:0

10000

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