SM6453AB_02 Datasheet, PDF (10/19 Pages) Nippon Precision Circuits Inc – 3-wire Serial Data Volume Control for Headphone Amplifier IC

SM6453AB
Microcontroller data description
Definition: “L” = V_IL1 level, “H” = V_IH1 level
MDT D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Don't care
EVR gain setting
GEVR: 0dB to -80dB, MUTE
Figure 2. Microcontroller data description
I D15 to D12: Not used (don’t care) bits. Can be either “L” or “H”.
I D11: AGC bit. OFF when “L”, and ON when “H”. AGC = OFF when system reset (see “Automatic gain
control function”).
D11
LOW
HIGH
AGC function
OFF
ON
I D10, D9: Bass boost control bits. Bass boost = OFF and bass boost mode = BB1 when system reset (see
“Bass boost function”).
D9
LOW
HIGH
D10
LOW
HIGH
LOW
HIGH
Bass boost
characteristics
OFF
BB1
BB2
I D8: Input select bit. LIN1 and RIN1 when “L”, and LIN2 and RIN2 when “H”. LIN1 and RIN1 input when
system reset.
D8
LOW
HIGH
Selected inputs
LIN1, RIN1
LIN2, RIN2
Input
LIN1
RIN1
LIN2
RIN2
Input Selector Block
Output
D8=L/D8=H
Input
Selector
LIN1/LIN2
RIN1/RIN2
To EVR Block
NIPPON PRECISION CIRCUITS INC.—10