M65855FP(EIC1) : Sound processor
14
15
6
Main control
Oscillator
8
16
9
10
3
2
1
4
5
11
7
13
12
V
cc
3. Block diagram.
1. Pin layout
2. Pin function
SymbolPin No. DESCRIPTION
GND1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CLOCKGND
ECHOMUTE
ECHOVOL
ECHOVOL
REF
REF
V
CC
OP2 IN
OP1 IN
LPF2 IN
LPF1 IN LPF2 OUT
LPF1 OUT
MIC OUT
MIC IN
OP2 OUT
OP1 OUT
CLOCK
ECHOMUTE
V
CC
OP1 IN
LPF1 IN
LPF1 OUT
MIC IN
OP1 OUT
Echo level control with external DC voltage
Echo mute control and clock stop control
with external DC voltage
Controls a built -in clock generation circuit with
external R
To connect 1/2 Vcc output and filter capacitor
Uses external C to from an D/A conversion
integrator
Uses external C to from an D/A conversion
integrator
Uses external CR to from a low pass filter at the
input side
Uses external CR to from a low pass filter at the
input side
Mixing output echo output and microphone
Microphone input
Applies a voltage of 3.5V to 5.5V(Rated5V)
REF
CLOCK
ECHOMUTE
ECHOVOL
MIC OUT
20Kbit
SRAM
AUTO
RESET
A/D
D/A
LPF1
LPF2
VOL
D1
DO1
DO0
CLOCK
MO
MI
RESET
1/2 Vss
MIX
GND
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