TC9455,88F/N

2002-02-05

3

Pin Number

TC9455N

TC9488N

TC9455F

TC9488F

Symbol

I/O

Function

Remarks

1

1

―

Digital supply voltage pin

2

2

CSCC

I

Capacitor connecting pin for CR oscillator (C = 68 pF)

3

3

OSCR

I

Resistor connecting pin for CR oscillator (R = 5.6 kΩ)

4

5

I

When VOLST = “L” level, DC control pin for MIC1 volume

5

6

VOL2 (SCL)

I

When VOLST = “H” level, clock input pin

When VOLST = “L” level, DC control pin for MIC2 volume

Open drain output

6

7

VOL3 (SDA)

I

When VOLST = “H” level, data input pin

When VOLST = “L” level, DC control pin for echo volume

Open drain output

7

9

VRO

―

Reference voltage pin

8

10

―

9

11

VDA

―

Analog supply voltage pin

10

13

ALC1

I

Auto level control pin 1

11

14

MC1N

I

MIC1 feedback signal input pin

12

15

MC1P

I

MIC1 signal input pin

13

16

MC2P

I

MIC2 signal input pin

14

17

MC2N

I

MIC2 feedback signal input pin

15

18

ALC2

I

Auto level control pin 2

16

20

VSA

―

Analog ground pin

17

21

MCO

O

MIC addition signal output pin

18

22

PRIN

I

Pre-filter input pin

19

23

ADIN

I

Pre-filter output signal or DC input pin

20

25

DAOUT

O

Post-filter output pin

21

26

VOLST

I

Electronic volume control mode select pin

When VOLST = “H” level, serial control (I

When VOLST = “L” level, DC level control

22

28

TEST

I

Test pin. Fix to “H” level for normal use

23

29

POOUT

O

Microphone echo signal output pin

24

30

―

Digital ground pin

Note 1: With the TC9455F and TC9488F, pins 4, 8, 12, 19, 24, and 27 are not connected (NC pins).

NC pins are normally open.