CS4201 Datasheet, PDF (62/68 Pages) Cirrus Logic – CrystalClear Audio Codec 97 with headphone Amplifier

CS4201
GPIO1/SDOUT - General Purpose I/O / Serial Data Ouput, Input/Output, Pin 44
This pin is a general purpose I/O pin that can be used to interface with various external circuitry. When
configured as an input, it functions as a Schmitt triggered input with 350 mV hysteresis at 5 V and 220
mV hysteresis at 3.3 V. When configured as an output, it can function as a normal CMOS output (4 mA
drive) or as an open drain output. This pin also provides the serial data for the first serial data port when
the SDEN bit in the Serial Port Control Register (Index 6Ah) is ‘set’. This bit powers up in the high
impedance state for backward compatibility.
Power Supply Pins
DVdd1, DVdd2 - Digital Supply Voltage, Pins 1 and 9
Digital supply voltage for the AC-link section of the CS4201. These pins can be tied to +5 V digital or to
+3.3 V digital. The CS4201 and controller’s AC-link should share a common digital supply.
DVss1, DVss2 - Digital Ground, Pins 4 and 7
Digital ground connection for the AC-link section of the CS4201. These pins should be isolated from
analog ground currents.
AVdd1, AVdd2 - Analog Supply Voltage, Pins 25 and 38
Analog supply voltage for the analog and mixed signal section of the CS4201 (AVdd1) as well as the
headphone amplifier (AVdd2). These pins must be tied to the analog +5 V power supply. It is strongly
recommended that +5 V be generated from a voltage regulator to ensure proper supply currents and
noise immunity from the rest of the system.
AVss1, AVss2 - Analog Ground, Pins 26 and 42
Ground connection for the analog, mixed signal, and substrate sections of the CS4201 (AVss1) as well
as the headphone amplifier (AVss2). These pins should be isolated from digital ground currents.
62
DS483PP3