PD17012GF-058_15 Datasheet, PDF (90/94 Pages) Renesas Technology Corp – PLL FREQUENCY SYNTHESIZER AND CONTROLLER FOR FM/MW/LW TUNER (AUTOMOBILE APPLICATION)

µPD17012GF-058
APPENDIX COMMUNICATION WITH ELECTRONIC VOLUME CONTROL IC (I²C BUS INTERFACE)
The µPD17012-058 sends specified data, such as volume and balance data, to the electronic volume control IC.
Two buses, the data bus and clock bus, are necessary to output data to the electronic volume control IC. Data and
clock signals are output from the EVOL_DA pin (pin 2) and EVOL_SCK pin (pin 1) of the µPD17012-058.
Figure A-1. Pin Connections (Electronic Volume Control)
EVOL_DA 2
µ PD17012GF-058
EVOL_SCK 1
Data
Clock
27 SDA
Electronic volume
28 SCL
control IC
Electronic volume control data consists of nine bits (eight bits for data and a check bit). The electronic volume
address (nine bits) and control data (nine bits) are sequentially transferred N times, where N is the number of
transferred data items, such as the volume and balance data.
Figure A-2. Data Transfer Format (Electronic Volume Control)
SDA
1
2
3
4
5
6
7
8
9
1
2
9
SCL
1
0
0
0
1
0
0
0
Electronic volume address
Data for
Volume
Balance
Audio switch
Bass
Treble
Fader
88