參數(shù)資料
型號： TDA9875AH/V2,557
廠商： NXP SEMICONDUCTORS
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： PLASTIC, QFP
文件頁數(shù)： 25/96頁
文件大?。?/td> 324K
代理商： TDA9875AH/V2,557
1999 Dec 20
31
Philips Semiconductors
Product specication
Digital TV Sound Processor (DTVSP)
TDA9875A
10 I2C-BUS CONTROL
10.1
Introduction
The TDA9875A is fully controlled via the I2C-bus. Control
is 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 to
determine whether any action is required.
The device has an I2C-bus slave transceiver, in
accordance with the fast-mode specification, with a
maximum speed of 400 kbits/s. Information concerning the
I2C-bus can be found in brochure
“I2C-bus and how to use
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 9).
Table 9
Possible slave addresses
The I2C-bus interface remains operational in the standby
mode of the TDA9875A 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
I2C-bus, i.e. when a slave address of 0000000 is sent by a
master.
The data transmission between the microcontroller and
the other I2C-bus controlled ICs is not disturbed when the
supply voltage of the TDA9875A is not connected.
10.2
Power-up state
At power-up the device is in the following state:
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
– SIF input level shift 0 dB.
Demodulators for both sound carriers set to FM with:
– Identification for B/G and 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.
After power-up a device initialization has to be performed
via the I2C-bus to put the TDA9875A into the proper mode
of operation, in accordance with the desired TV standard,
audio control settings, etc.
ADDR2
ADDR1
SLAVE ADDRESS
A6
A5
A4
A3
A2
A1
A0
LOW
1011000
LOW
HIGH
1011001
HIGH
LOW
1011010
HIGH
1011011
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