TWL1110

VOICE-BAND AUDIO PROCESSOR (VBAP

™)

SLWS103 – NOVEMBER 2000

7

POST OFFICE BOX 655303

functional description (continued)

DTMF gain MUX

The DTMF gain MUX selects the signal path and applies the appropriate gain setting. Therefore the device is

either in tone mode or in voice mode. When set in the voice mode, the gain is controlled by the auxiliary register

and is set to 0 dB or 6 dB. When set in the tone mode, the gain is from –12 dB to 12 dB in 6-dB steps which

is set by the volume control register. The gain setting is controlled by the RXPGA register. This will not create

any control contention since the device is working in one mode at a time.

Terminal Functions

TERMINAL†

NAME

NO.

I/O

DESCRIPTION

NAME

µBGA

TQFP

I/O

DESCRIPTION

AVDD

A1

32

I

Analog positive power supply

AVSS

J1

8

I

Analog negative power supply (use for ground connection)

BUZZCON

F9

19

O

Buzzer output, a pulse-density modulated signal to apply to external buzzer driver

DVDD

J6

13

I

Digital positive power supply

DVSS

J7

14

I

Digital negative power supply

EAR1ON

A6

27

O

Earphone 1 amplifier output (–)

EAR1OP

A4

29

O

Earphone 1 amplifier output (+)

EAR2O

A2

31

O

Earphone 2 amplifier output

EARVDD

A5

28

I

Analog positive power supply for the earphone amplifiers

EARVSS

A3, A7

30, 26

I

Analog negative power supply for the earphone amplifiers

MBIAS

B1

1

O

Microphone bias supply output, no decoupling capacitors

MCLK

C9

22

I

Master system clock input (2.048 MHz, digital)

MIC1P

C1

2

I

MIC1 input (+)

MIC1N

D1

3

I

MIC1 input (–)

MIC2P

E1

4

I

MIC2 input (+)

MIC2N

F1

5

I

MIC2 input (–)

MUXIN

H1

7

I

Analog MUX input

MUXOUT1

J2

9

I

Analog MUX output

MUXOUT2

J3

10

I

Analog MUX output

PCMI

J8

15

I

Receive PCM input

PCMO

J9

16

O

Transmit PCM output

PCMSYN

G9

18

I

PCM frame sync

PCMCLK

H9

17

I

PCM data clock

PLLVSS

A9

24

I

PLL negative power supply

PLLVDD

A8

25

I

PLL digital power supply

PWRUPSEL

E9

20

I

Selects the power-up default mode

REXT

G1

6

I/O

Internal reference current setting terminal (use precision 100

Ω resistor and no filtering

capacitors)

RESET

D9

21

I

Active low reset

SCL

J5

12

I

I2C-bus serial clock (this input is used to synchronize the data transfer from and to the

VBAP)

SDA

J4

11

I/O

I2C-bus serial address/data input/output. This is a bidirectional terminal used to transfer

register control addresses and data into and out of the codec. It is an open

and therefore requires a pullup resistor to VDD (typical 10 kΩ for 100 kHz).

VSS

B9

23

I

Ground return for bandgap internal reference (use for ground connection)

† All MicroStar Junior BGAt pins that are not mentioned have no internal connection.