TEA6825T PHILIPS [NXP Semiconductors], TEA6825T Datasheet - Page 27

• Manufacturer Part Number: TEA6825T
• Description: In Car Entertainment ICE car radio
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
I
I
The standard I
following definitions.
Structure of the I
increment and expansion to switch a direct transfer of all
transmissions to an output for the radio front-end IC
(TEA6810T respectively TEA6811T).
Subaddresses are not used.
D
Data sequence:
The data transfer may be in this order only. The transfer
direction of the data bytes is defined by the LSB of the
address.
The data becomes valid at the output of the internal
latches with the acknowledge of each byte. A STOP
condition after any byte can shorten transmission times.
When writing to the transceiver by using the STOP
condition before completion of the whole transfer:
D
A data bit in the transceiver of the TEA6823T or TEA6825T
enables or disables a direct transfer of all transmissions to
an interface stage for the front-end IC.
For a transmission to the front-end IC the address and the
data format of the front-end IC has to be used.
Remark: the pull-up resistors for the front-end interface
(pins 6 and 7) should not be connected to the 5 V supply
voltage of the front-end IC, otherwise a bus pull-down
(pin 53) can occur during switching off the front-end supply
when the interface stage is enabled.
D
Data transfer to the IF IC (TEA6823T or TEA6825T) is
independent of the state of interface stage for the front-end
IC.
1998 Mar 24
2
2
C-BUS AND I
C-bus specification
ATA TRANSFER FOR THE
ATA TRANSFER TO AN OUTPUT OF THE FRONT
ATA TRANSFER TO THE
Address
Byte 1
Byte 2.
The remaining bytes will contain the old information
If the transfer of a byte was not completed, this byte is
lost and the previous information is available.
In Car Entertainment (ICE) car radio
2
2
C-bus specification is expanded by the
C-BUS CONTROLLED FUNCTIONS
2
C-bus logic: slave transceiver with auto
IF IC
TEA6823T
AND THE
-
END
TEA6825T
IC
27
Table 1 Structure of the I
Table 2 Data to be received by the IC for data byte 1
Table 3 Reference frequency setting in data byte 1;
Bus address of the
TEA6823T and the
TEA6825T
Subaddress
Hardware (pin)
programmable
address bits
Default settings by
power-on reset
BIT 3
BIT
0
1
2
3
4
5
6
7
0
0
0
0
1
1
1
1
DESCRIPTION
switch for mono
switch for stereo
LSB reference frequency for
synthesizer
reference frequency for
synthesizer
MSB reference frequency for
synthesizer
tuning mute off
tuning mute on
SDS/SDR hold off
SDS/SDR hold on
radio mute off
radio mute on
I
I
2
2
see Table 1
BIT 2
C-bus to front-end ENABLED
C-bus to front-end DISABLED
0
0
1
1
0
0
1
1
BIT 1
DESCRIPTION
0
1
0
1
0
1
0
1
TEA6823T; TEA6825T
1100001X
not used
not available
data byte 1 bits 4 to 7 are set to
logic 0; all other bits are random
3 kHz
5 kHz
10 kHz
15 kHz
25 kHz
50 kHz
not defined
not defined
2
C-bus
FREQUENCY SETTING
SPECIFICATION
Preliminary specification
bit 0 = 1
bit 0 = 0
bit 4 = 1
bit 4 = 0
bit 5 = 1
bit 5 = 0
bit 6 = 1
bit 6 = 0
bit 7 = 1
bit 7 = 0
RESULT