LM84

· Directly senses die temperature of remote ICs
· Senses temperature of remote diodes
· SMBus compatible interface, supports SMBus Timeout
· Register readback capability
·7 bit plus sign temperature data format
· 2 address select lines enable 9 LM84s to be connected to a single bus

· System Thermal Management
·Personal Computers
· Electronic Test Equipment
·Office Electronics
· HVAC

The LM84 is a remote diode temperature sensor, Delta-Sigma analog-to-digital converter, and digital over-temperature detector with an SMBus™ interface.

The LM84 senses its own temperature as well as the temperature of a target IC with a diode junction, such as a Pentium® II processor or a diode connected 2N3904. A diode junction semiconductor junction) is required on the target IC's die. A host can query the LM84 at any time to read the temperature of this diode as well as the temperature state of the LM84 itself. A T_CRIT_A interrupt output becomes active when the temperature is greater than a programmable comparator limit, T_CRIT.

The host can program as well as read back the state of the T_CRIT register. Three state logic inputs allow two pins ADD0, ADD1) to select up to 9 SMBus address locations for the LM84. The sensor powers up with default thresholds of 127°C for T_CRIT.