CS4226_04 Datasheet, PDF (35/37 Pages) Cirrus Logic – Surround Sound Codec

CS4226
Control Port Signals
I²C/SPI - Control Port Format, PIN 7.
Setting this pin high configures the control port for the I²C interface; a low state configures the control
port for the SPI interface. The state of this pin sets the function of the control port input/output pins.
SCL/CCLK - Serial Control Interface Clock, PIN 3.
SCL/CCLK is the serial control interface clock, and is used to clock control bits into and out of the
CS4226.
AD0/CS - Address Bit / Control Port Chip Select, PIN 6.
In I²C mode, AD0 is a chip address bit. In SPI software control mode, CS is used to enable the control
port interface on the CS4226.
AD1/CDIN - Address Bit / Serial Control Data In, PIN 5.
In I²C mode, AD1 is a chip address bit. In SPI software control mode, CDIN is the input data line for the
control port interface.
SDA/CDOUT - Serial Control Data Out, PIN 4.
In I²C mode, SDA is the control data I/O line. In SPI software control mode, CDOUT is the output data
from the control port interface on the CS4226.
Clock and Crystal Pins
XTI, XTO - Crystal connections, PIN 28, 29.
Input and output connections for the crystal which may be used to operate the CS4226. Alternatively, a
clock may be input into XTI.
CLKOUT - Master Clock Output, PIN 31.
CLKOUT allows external circuits to be synchronized to the CS4226. Alternate output frequencies are
selectable by the control port.
Miscellaneous Pins
FILT - PLL Loop Filter Pin, PIN 15.
A capacitor, C_FILT, in series with a resistor, R_FILT, should be connected from FILT to AGND. Additionally
a capacitor, C_RIP, should be placed in parallel with C_FILT and R_FILT. See Figure 1 for recommended
component values.
PDN - Powerdown Pin, PIN 8.
When low, the CS4226 enters a low power mode and all internal states are reset, including the control
port. When high, the control port becomes operational and the RS bit must be cleared before normal
operation will occur.
DS188F4
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