CS4294SLASHCS4298 datasheet(75/81 Pages) CIRRUS

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CS4205

DS489PP4

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 pin powers up in

the high impedance state for backward compatibility.

GPIO2/SDI1 - General Purpose I/O / Serial Data Input 1, Input/Output, Pin 39

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 receives the serial data for the first serial input

port when the SDI1 bit in the Serial Port Control Register (Index 6Ah) is ‘set’. This pin powers up in the

high impedance state for backward compatibility.

GPIO3/SDI2 - General Purpose I/O / Serial Data Input 2, Input/Output, Pin 40

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 receives the serial data for the second serial input

port when the SDI2 bit in the Serial Port Control Register (Index 6Ah) is ‘set’. This pin powers up in the

high impedance state for backward compatibility.

GPIO4/SDI3 - General Purpose I/O / Serial Data Input 3, Input/Output, Pin 41

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 receives the serial data for the third serial input

port when the SDI3 bit in the Serial Port Control Register (Index 6Ah) is ‘set’. This pin powers up in the

high impedance state for backward compatibility.

ZLRCLK - ZV Port Left-Right Clock, Input, Pin 32

This pin receives the Left/Right clock for the Zoomed Video Port. The L/R clock determines which

channel is currently being inputted on the ZSDATA pin. The signal must conform to the ZV Port

Specification.

ZSDATA - ZV Port Serial Data, Input, Pin 33

This pin receives two’s complement MSB-first serial audio data for the Zoomed Video Port. The data is

clocked into the CS4205 by the ZSCLK, and the channel is determined by ZLRCLK. The signal must

conform to the ZV Port Specification.

ZSCLK - ZV Port Serial Clock, Input, Pin 34

This pin receives the serial clock for the Zoomed Video Port. The serial clock is used to clock data on

the ZSDATA pin into the CS4205. The signal must conform to the ZV Port Specification.

Power Supply Pins

DVdd1, DVss1 - Digital Supply Voltage 1 / Digital Ground 1, Pins 1 and 4

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