CDB3308 Cirrus Logic Inc, CDB3308 Datasheet - Page 26
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CDB3308
Manufacturer Part Number
CDB3308
Description
BOARD EVAL FOR CS3308 VOL CTRL
Manufacturer
Cirrus Logic Inc
Specifications of CDB3308
Main Purpose
Audio, Volume Control
Embedded
No
Utilized Ic / Part
CS3308
Primary Attributes
8 Single-Ended Analog Inputs and Outputs, USB or RS232 Interface
Secondary Attributes
Graphic User Interface
Description/function
Audio DSPs
Operating Supply Voltage
5 V
Product
Audio Modules
For Use With/related Products
CS3308
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
Other names
598-1496
CS3308
Once this configuration process is complete, every device may be independently controlled with a standard
SPI communication cycle using the device’s newly assigned Individual device addresses.
5.8.2.2
I²C Mode Control Configuration
Up to 128 CS3308’s may be connected to a common I²C serial control bus. This shared serial bus is used
to assign a unique device address to each device on the bus such that they may be independently ad-
dressed. To implement this method of device address configuration, the devices must be connected as
shown in
Figure
11.
SDA
SCL
SCL
SDA
SCL
SDA
SCL
SDA
μC
RST
RESET
Device 1
ENout
RESET
Device 2
ENout
RESET
Device 3
ENout
Figure 11. I²C Serial Control Connections
Note that the serial control signals SCL and SDA are connected in parallel to each CS3308. The active low
reset output of the system controller is connected to the RESET input of the first CS3308 in the chain. The
ENOut of the first device is connected to the RESET input of the second CS3308 whose ENOut signal is
connected to the third CS3308. This pattern of connecting the ENOut of device N to the RESET input of
device N+1 may be repeated for up to 128 devices per common I²C bus. If more than 128 devices are re-
quired in a system, separate SDA or SCL signals may be used to create additional chains of up to 128 de-
vices.
As each device is placed into reset (RESET is low), its ENOut signal is driven low. The ENOut signal will
continue to be driven low until the device is taken out of reset (RESET is high) and the Enable bit (see
“En-
able Next Device (Bit 0)” on page
41) is set, at which time the ENOut signal will be driven high.
To configure a unique Individual device address for each device on the shared serial bus, the first device
must be reset (a low to high transition on its RESET pin), the Individual device address register must be
written (using the CS3308’s default device address) with a unique device address, and the Enable bit must
be set to take the next device in the serial control chain out of reset. This process may be repeated until all
devices in the serial control chain have been assigned a new Individual device address.
Figure 10
dia-
grams this configuration process.
Notice that
Figure 10
shows the setting of the Individual address and the setting of the Enable bit as two
discrete steps. While this demonstrates one approach to device configuration, it should be noted that two
steps are not necessary to complete the action of setting the Individual address and enabling the next de-
vice. This may be done simultaneously with one register write (containing the new Individual address and
the Enable bit set) to the Individual address register.
Once the configuration process is complete, every device may be independently controlled with a standard
I²C communication cycle using the device’s newly assigned Individual device addresses.
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