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IDT5V9882T

3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR

Integrated Device Technology 

IDT5V9882T

3.3V EEPROM PROGRAMMABLE CLOCK GENERATOR

INDUSTRIAL TEMPERATURE RANGE

PROGSAVE

S Address R/W ACK Command Code ACK P

7-bits 0 1-bit 8-bits:xxxxxx01 1-bit

PROGRESTORE

S Address R/W ACK Command Code ACK P

7-bits 0 1-bit 8-bits:xxxxxx10 1-bit

NOTE:

PROGWRITE is for writing to the 5v9882T registers.

PROGREAD is for reading the 5v9882T registers.

PROGSAVE is for saving all the contents of the 5v9882T registers to the EEPROM.

PROGRESTORE is for loading the entire EEPROM contents to the 5v9882T registers.

EEPROM INTERFACE

The IDT5V9882T can also store its configuration in an internal EEPROM. The contents of the device's internal programming registers can be saved to the

EEPROM by issuing a save instruction (ProgSave) and can be loaded back to the internal programming registers by issuing a restore instruction (ProgRestore).

To initiate a save or restore using I2C, only two bytes are transferred. The Device Address is issued with the read/write bit set to "0", followed by the appropriate

command code. The save or restore instruction executes after the STOP condition is issued by the Master, during which time the IDT5V9882T will not generate

Acknowledge bits. The 5V9882T will acknowledge the instructions after it has completed execution of them. During that time, the I2C bus should be interpreted

as busy by all other users of the bus.

In order for the save and restore instructions to function properly, the IDT5V9882T must not be in shutdown mode (SHUTDOWN pin asserted). In the event

of an interrupt of some sort such as a power down of the part in the middle of a save or restore operation, the contents to or from the EEPROM will be partially

loaded, and a CRC error will be generated. The CERR bit (0x81) will be asserted to indicate that an error has occurred. The LOSS_LOCK signal will also

be asserted.

On power-up of the IDT5V9882T, an automatic restore is performed to load the EEPROM contents into the internal programming registers. The auto-restore

will not function properly if the device is in shutdown mode (SHUTDOWN pin asserted). The IDT5V9882T will be ready to accept a programming instruction

once it acknowledges its 7-bit I2C address.

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