I²C Bus Systems; Data Inputs/Outputs In I2C Bus - Loewe Q2500B Serviceanleitung

Technology of Q 2500 colour TV set
(only with DVB)
24 C256
(EAROM 2)
Picture 4 - 10
Sound
MSP 3411
(only with PIP)
PIP-Video
VPC 3233
Video Comb.
Filter
VPC 3230
Video/deflec.
prozessor
TDA 9332
BESIC
FALCONIC
SAA 4979
SAA 4993
µP-BUS
4.2.1 I²C bus systems
The I²C bus is a two-wire bus system consist-
ing of a DATA line and a clock line. This bus
system permits the serial and bi-directional
exchange of communication between several
microprocessors and peripheral ICs that pos-
sess an I²C bus interface. This means that the
number of connections is reduced, which re-
sults in a simplified switching structure, and
increased reliability (fewer solder points, con-
nections, contacts, etc.).
Document Q 2500
Q 2500/H bus systems
24 C 64
(EAROM 1)
I2C- Bus 0
Audio
switch
TEA 6420
SDRAM
64Mbit-H
16Mbit-B/M
27 V 322/160
(Operating software)
CCU
V24 RXD/TXD
SDA 6000
I2C-Bus 2
Video
switch
TEA 6415
I2C-Bus 1
Chroma
switch
TEA 6415
Audio
switch
TEA 6422
Via pull-up resistors, both lines are in a state
of rest (i.e. no data transfer) at H level. Data
transfer starts if a clock line is "High" and a
negative flank (H > L) appears on the DATA
line (Start condition). Evaluation of the data
occurs during the H level of the clock pulse.

Data inputs/outputs in I2C bus

Data in
Data out
73
Control
(optional)
DVB
Module
SAT-/
Twin-
(only with PIP)
HF/ZF
P 1
4k7
+5V
© Loewe ProCollege
V24 service
interface
8 pin
Online
Module
(optional)
SAT
unit
PIP
HF/ZF
(Hyperband-Tuner)
P 2
Data in
Data out