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Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3)
Application Note
96029
4.2.2 Automatically detected options
CCR612S will detect the following options automatically:
Digital sound control chip.
Presence / absence of a sound control chip (TEA632x) is detected by testing its I
2
C bus address.
NOTE: The output pins AUMUTE, LOUDN and TA are always operational, even when a digital sound
control chip is installed. Cassette solenoid and AMS pause control functions are not available in case
no TEA632x is installed.
AMS }
DOLBY } These functions are not available if the corresponding
MTL } output pin is connected to Vdd except for pins CAMS
LOUDNESS } and LOUD which must be connected to ground.
DIAGNOSTICS }
Presence of the CD-changer (check during power-on)
4.3 I
2
C bus addresses
CCR612 I
2
C bus peripherals will be accessed at the following addresses:
C4 h PLL synthesizer TEA6811V
C2 h IF system TEA6822T
80 h Sound control circuit TEA632x
A0 h NVM PCF8594
(The PCF8594 responds automatically to address A2 h for access to its upper half);
40 h I/O expander PCF8574
70 h Display driver PCF8576
4.4 The keyboard
Two different configurations are possible:
1. A fixed keyboard, directly connected to the microcontroller.
2. A detachable keyboard, using an I/O expander to connect to the microcontroller via a dedicated
I
2
C bus. A fixed keyboard with a limited number of keys still remains possible.
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