CS3308 datasheet(26/44 Pages) CIRRUS

26 / 44 page

DS702F1

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.

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.

μC

SDA

SCL

Device 1

SCL

SDA

RESET

ENout

Device 2

SCL

SDA

RESET

ENout

Device 3

SCL

SDA

RESET

ENout

RST

Figure 11. I²C Serial Control Connections

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