UC3730

UC1730 UC2730 UC3730 Thermal Monitor FEATURES On-Chip Temperature Transducer Temperature Comparator Gives Threshold Temperature Alarm Power Reference Permits Airflow Diagnostics Precision 2.5V Power Reference Permits Airflow Diagnostics Transducer Output is Easily Scaled for Increased Sensitivity Low 2.5mA Quiescent Current DESCRIPTION The UC1730 family of integrated circuit devices are designed to be used in a number of thermal monitoring applications. Each IC combines a temperature transducer, precision reference, and temperature comparator allowing the device to respond with a logic output if temperatures exceed a user programmed level. The reference on these devices is capable of supplying in excess of 250mA of output current − by setting a level of power dissipation the rise in die temperature will vary with airflow past the package, allowing the IC to respond to airflow conditions These devices come in an 8-Pin DIP, plastic or ceramic, a 5-Pin TO-220 or a PLCC-20 version. In the 8-Pin version, a PTAT (proportional to absolute temperature) output reports die temperature directly. This output is configured such that its output level can be easily scaled up with two external gain resistors. A second PTAT source is internally referenced to the temperature comparator. The other input to this comparator can then be externally programmed to set a temperature threshold. When this temperature threshold is exceeded an alarm delay output is activated. Following the a...