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May 12, 2010

IDT Confidential

EVENT Pin Mode Functionality

Serial Communications

The SPD section of the TSE2002B3C is a 2 Kbit serial EEPROM organized as a 256 byte memory. The device is able to lock permanently the data

in the lower sector (from location 0x00 to 0x7F), designed specifically for use in DRAM DIMMs (Dual Inline Memory Modules) with Serial Presence

Detect. All the information concerning the DRAM module configuration (such as its access speed, its size, its organization) can be kept write protected

in the first half of the memory.

Locking the lower sector of the SPD may be accomplished using one of two software write protection mechanisms. By sending the device a

specific I2C sequence, the first 128 bytes of the memory become write protected, either permanently or resetable.

The TSE2002B3C temperature sensor circuitry continuously monitors the temperature and updates the temperature data minimum of eight times

per second. Temperature data is latched internally by the device and may be read by software from the bus host at any time.

Internal registers are used to configure both the TS performance and response to over-temperature conditions. The device contains programmable

high, low, and critical temperature limits. Finally, the device EVENT pin can be configured as active high or active low and can be configured to operate

as an interrupt or as a comparator output.