CS4220 CS4221
SDIN
9
Serial Data Input (Input) - Two’s complement MSB-first serial data is input on this pin. The
required relationship between the left/right clock, serial clock and serial data is defined by the
DSP Port Mode (05h) register. The options are detailed in Figures 8 - 11.
SCL/CCLK
SDA/CDIN
10
11
Serial Control Port Clock (Input) - Clocks the serial control bits into and out of the CS4221.
In I2C mode, SCL requires an external pull-up resistor according to the I2C specification.
Serial Control Port Data (Input/Output)- SDA is a data I/O line in I2C mode and requires an
external pull-up resistor according to the I2C specification. CDIN in the input data line for the
serial control port in SPI mode.
Address Bit/Control Chip Select (Input) - In I2C mode, AD0 is a chip address bit. In SPI
mode, CS is used to enable the control port interface on the CS4221. The CS4221 control port
interface is defined by the SPI/I2C pin.
AD0/CS
12
VL
13
Logic Power (Input) - Positive power supply for the digital interface section. Typically 3.0 to
5.0 VDC.
AINR-, AINR+
16,17
Differential Right Channel Analog Input (Input) - The full scale analog input level (differen-
tial) is specified in the Analog Characteristics specification table and may be AC coupled or DC
coupled into the device, see Figure 12 for optional line input buffer.
I2C/SPI
18
Control Port Format (Input) - When this pin is high, I2C mode is selected, when low, SPI is
selected.
AINL-, AINL+
19,20
Differential Left Channel Analog Input (Input) - The full scale analog input level (differential)
is specified in the Analog Characteristics specification table and may be AC coupled or DC
coupled into the device, see Figure 12 for optional line input buffer.
VA
21
22
Analog Power (Input) - Positive power supply for the analog section. Typically 5.0 VDC.
Analog Ground (Input) - Analog ground reference.
AGND
AOUTR-,
AOUTR+
23, 24
Differential Right Channel Analog Outputs (Output) - The full scale analog output level (dif-
ferential) is specified in the Analog Characteristics specification table.
AOUTL-,
AOUTL+
25, 26
27
Differential Left Channel Analog Outputs (Output) - The full scale analog output level (dif-
ferential) is specified in the Analog Characteristics specification table.
RST
Reset (Input) - When low, the device enters a low power mode and all internal registers are
reset, including the control port. When high, the control port becomes operational and normal
operation will occur.
DS284PP3
21
CIRRUS [ CIRRUS LOGIC ]
