PD17012GF-055_15 Datasheet, PDF (76/84 Pages) Renesas Technology Corp – SINGLE-CHIP MICROCONTROLLER WITH ON-CHIP PRESCALER, PLL FREQUENCY SYNTHESIZER, AND IF COUNTER FOR CAR-MOUNTED FM/MW/LW RADIO

µPD17012GF-055
APPENDIX DESCRIPTION OF ELECTRONIC VOLUME CONTROL
Appendix 1. Function of Electronic Volume
The µPD17012GF-055 uses electronic volume to control and select the sound.
The electronic volume functions are as follows.
(1) Volume adjustment
(2) Bass adjustment
(3) Treble adjustment
(4) Balance adjustment
(5) Fader adjustment
(6) Loudness
(7) Attenuator
(8) Sound selector
(0 to 50 steps)
(–7 to +7 steps)
(–7 to +7 steps)
(L7 to R7 steps)
(F7 to R7 steps)
(On/Off)
(On/Off)
For adjustments for each function, refer to the descriptions of the SELECT key and VOLUP /
VOLDOWN ^key.
Appendix 2. Description of the Electronic Volume Control
The µPD17012GF-055 uses an electronic volume IC to control and select the sound.
The µPD17012GF-055 transfers the initial data settings to electronic volume about 480-500 ms after the
transition from initial low level to high level at the PWROUT pin, when the power supply for the VDD pin is turned
on (power on reset).
In addtion, the µPD17012GF-055 uses the I²C bus.
The pin configuration between the µPD17012GF-055 and the electronic volume is as follows.
Figure A-1. Pin Configuration of Electronic Volume
µPD17012GF-055
Data
VOLSDA 27
Clock
VOLSCL 28
Power
PWROUT 44
27 SDA
Electronic volume
28 SCL
2
VDD
74