參數(shù)資料
型號(hào)： TDA9870A
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Digital TV Sound Processor DTVSP
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP64
封裝： SHRINK, PLASTIC, DIP
文件頁數(shù)： 28/88頁
文件大?。?/td> 362K
代理商： TDA9870A
1998 Aug 10
28
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9870A
10 I
2
C-BUS CONTROL
10.1
Introduction
The TDA9870A is fully controlled via the I
2
C-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 I
2
C-bus slave transceiver, in
accordance with the fast-mode specification, with a
maximum speed of 400 kbits/s. Information concerning the
I
2
C-bus can be found in brochure “I
2
C-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 8).
Table 8
Possible slave addresses
The I
2
C-bus interface remains operational in the standby
mode of the TDA9870A 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
2
C-bus, i.e. when a slave address of 0000000 is sent by a
master.
The data transmission between the microcontroller and
the other I
2
C-bus controlled ICs is not disturbed when the
supply voltage of the TDA9870A is not connected.
ADDR2
ADDR1
SLAVE ADDRESS A6 TO A0
0
0
1
1
0
1
0
1
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
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, D/K, response time 1 s
– Level adjust set to 0 dB
– De-emphasis 50
μ
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 I
2
C-bus to put the TDA9870A into the proper mode
of operation, in accordance with the desired TV standard,
audio control settings, etc.
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