CDCM6208V1RGZT datasheet(53/78 Pages) TI

Part #	CDCM6208V1RGZT

Description	2:8 CLOCK GENERATOR, JITTER CLEANER WITH FRACTIONAL DIVIDERS

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Data out

CDCM6208

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SCAS931A – MAY 2012 – REVISED JUNE 2012

In an I2C bus system, the CDCM6208 acts as a slave device and is connected to the serial bus (data bus SDA

and clock bus SCL). The SDA port is bidirectional and uses an open drain driver to permit multiple devices to be

connected to the same serial bus. The CDCM6208 allows up to four unique CDCM6208 slave devices to occupy

the I2C bus in addition to any other I2C slave device with a different I2C address. These slave devices are

accessed via a 7-bit slave address transmitted as part of an I2C packet. Only the device with a matching slave

address responds to subsequent I2C commands. The device slave address is 10101xx (the two LSBs are

determined by the AD1 and AD0 pins). The five MSBs are hard-wired, while the two LSBs are set through pins

on device powerup.

Figure 48.

During the data transfer through the I2C port interface, one clock pulse is generated for each data bit transferred.

The data on the SDA line must be stable during the high period of the clock. The high or low state of the data

line can change only when the clock signal on the SCL line is low. The start data transfer condition is

characterized by a high-to-low transition on the SDA line while SCL is high. The stop data transfer condition is

characterized by a low-to-high transition on the SDA line while SCL is high. The start and stop conditions are

always initiated by the master. Every byte on the SDA line must be eight bits long. Each byte must be followed

by an acknowledge bit and bytes are sent MSB first.

The acknowledge bit (A) or non-acknowledge bit (A) is the 9thbit attached to any 8-bit data byte and is always

generated by the receiver to inform the transmitter that the byte has been received (when A = 0) or not (when A

= 1). A = 0 is done by pulling the SDA line low during the 9thclock pulse and A = 1 is done by leaving the SDA

line high during the 9thclock pulse.

The I2C master initiates the data transfer by asserting a start condition which initiates a response from all slave

devices connected to the serial bus. Based on the 8-bit address byte sent by the master over the SDA line

(consisting of the 7-bit slave address (MSB first) and an R/W bit), the device whose address corresponds to the

transmitted address responds by sending an acknowledge bit. All other devices on the bus remain idle while the

selected device waits for data transfer with the master. The CDCM6208 slave address bytes are given in below

table.

After the data transfer has occurred, stop conditions are established. In write mode, the master asserts a stop

condition to end data transfer during the 10 thclock pulse following the acknowledge bit for the last data byte from

the slave. In read mode, the master receives the last data byte from the slave but does not pull SDA low during

the 9thclock pulse. This is known as a non-acknowledge bit. By receiving the non-acknowledge bit, the slave

knows the data transfer is finished and enters the idle mode. The master then takes the data line low during the

low period before the 10 thclock pulse, and high during the 10 thclock pulse to assert a stop condition.

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