TDA9875 Philips Semiconductors, TDA9875 Datasheet - Page 29

• Manufacturer Part Number: TDA9875
• Description: Digital TV Sound Processor DTVSP
• Manufacturer: Philips Semiconductors

Philips Semiconductors
10 I
10.1
The TDA9875 is fully controlled via the I
exercised by writing data to one or more internal registers.
Status information can be read from an array of registers
to enable the controlling microcontroller determine
whether any action is required.
The device has an I
accordance with the fast-mode specification, with a
maximum speed of 400 kbits/s. Information concerning the
I
it” (order number 9398 393 40011). To avoid conflicts in a
real application with other ICs providing similar or
complementary functions, there are four possible slave
addresses available which can be selected by pins
ADDR1 and ADDR2 (see Table 7).
Table 7 Possible slave addresses
The I
mode of the TDA9875 to allow control of the analog source
selectors with regard to SCART-to-SCART copying.
The device will not respond to a ‘general call’ on the
I
master.
The data transmission between the microcontroller and
the other I
supply voltage of the TDA9875 is not connected.
1998 Feb 13
2
2
C-bus can be found in brochure “I
C-bus, i.e. when a slave address of 0000000 is sent by a
ADDR2
Digital TV Sound Processor (DTVSP)
2
2
0
0
1
1
C-BUS CONTROL
C-bus interface remains operational in the standby
Introduction
2
C-bus controlled ICs is not disturbed when the
ADDR1
0
1
0
1
2
C-bus slave transceiver, in
SLAVE ADDRESS A6 TO A0
2
1 0 1 1 0 0 0
1 0 1 1 0 0 1
1 0 1 1 0 1 0
1 0 1 1 0 1 1
C-bus and how to use
2
C-bus. Control is
29
10.2
At power-up the device is in the following state:
After power-up a device initialization has to be performed
via the I
of operation, in accordance with the desired TV standard,
audio control settings, etc.
All outputs muted
No sound carrier frequency loaded
General-purpose I/O pins ready for input (HIGH)
Input SIF1 selected with:
– AGC on
– Small hysteresis.
Demodulators for both sound carriers set to FM with:
– Identification for B/G, D/K, response time 1 s
– Level adjust set to 0 dB
– De-emphasis 50 s
– Matrix set to mono.
Main channel set to FM input with:
– Spatial off
– Pseudo off
– AVL off
– Volume mute
– Bass flat
– Treble flat
– Contour off
– Bass boost flat.
Auxiliary channel set to FM input with:
– Volume mute
– Bass flat
– Treble flat.
Feature interface all outputs off
Beeper off
Monitoring of carrier 1 FM demodulator DC output.
Power-up state
2
C-bus to put the TDA9875 into the proper mode
Preliminary specification
TDA9875