TAS2521

SLAS687A – FEBRUARY 2013 – REVISED FEBRUARY 2013

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5.3.3

Multifunction Pins

Table 5-1 shows the possible allocation of pins for specific functions. The PLL input, for example, can be

programmed to be any of 4 pins (MCLK, BCLK, DIN, GPIO).

Table 5-1. Multifunction Pin Assignments

1

2

3

4

5

6

7

Pin Function

MCLK

BCLK

WCLK

DIN

GPIO

SCLK

MISO

/DOUT

A

PLL Input

E

B

Codec Clock Input

C

D

E

E, D

F

E

G

E, D

H

E

I

General Purpose Output I

E

I

General Purpose Output II

E

J

General Purpose Input I

E

J

General Purpose Input II

E

J

General Purpose Input III

E

K

INT1 output

E

E

L

INT2 output

E

E

M

E

E

N

E

E

O

E

E

P

E

E

Q

E

E

R

E

S

Aux Clock Output

E

E

(1)

(2)

(3)

(4)

D: Default Function

(5)

E: The pin is exclusively used for this function, no other function can be implemented with the same pin. (If GPIO/DOUT has been

allocated for General Purpose Output, it cannot be used as the INT1 output at the same time.)

5.4

Audio Analog I/O

The TAS2521 features a mono audio DAC. It supports a wide range of analog interfaces to support

different headsets such as 16-

Ω to 200-Ω impedance and analog line outputs. TheTAS2521 can drive a

speaker upto 4-

Ω impedance.

5.5

Analog Signals

The TAS2521 analog signals consist of:

•

Analog inputs AINR and AINL, which can be used to pass-through or mix analog signals to output

stages

•

Analog outputs class-D speaker driver and headphone/lineout driver providing output capability for the

DAC, AINR, AINL, or a mix of the three

20

Application Overview

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