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
B
C
D
E
F
G
H
I
PLL Input
S(1)
S(1),D(4)
S(2)
S(2)
S(2),D
E(5)
E
S(3)
S(3)
Codec Clock Input
I2S BCLK input
I2S BCLK output
I2S WCLK input
I2S WCLK output
I2S DIN
I2S DOUT
E, D
E
E, D
E
E
General Purpose Output I
General Purpose Output II
General Purpose Input I
General Purpose Input II
General Purpose Input III
INT1 output
I
E
J
E
J
E
J
E
K
L
M
N
O
P
Q
R
S
E
E
E
E
E
E
E
E
E
INT2 output
Secondary I2S BCLK input
Secondary I2S WCLK input
Secondary I2S DIN
Secondary I2S BCLK OUT
Secondary I2S WCLK OUT
Secondary I2S DOUT
Aux Clock Output
E
E
E
E
E
E
E
E
(1) S(1): The MCLK pin can drive the PLL and Codec Clock inputs simultaneously.
(2) S(2): The BCLK pin can drive the PLL and Codec Clock and audio interface bit clock inputs simultaneously.
(3) S(3): The GPIO/DOUT pin can drive the PLL and Codec Clock inputs simultaneously.
(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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