ADT7481

ADT7481 Dual Channel Temperature Sensor and Overtemperature Alarm The ADT7481 is a 3-channel digital thermometer and under/ over temperature alarm, intended for use in PCs and thermal management systems. It can measure its own ambient temperature or the temperature of two remote thermal diodes. These thermal diodes can be located in a CPU or GPU, or they can be discrete diode connected transistors. The ambient temperature, or the temperature of the remote thermal diode, can be accurately measured to ±1°C. The temperature measurement range defaults to 0°C to +127°C, compatible with ADM1032, but can be switched to a wider measurement range from −64°C to +191°C. The ADT7481 communicates over a 2-wire serial interface compatible with System Management Bus (SMBus) standards. The SMBus address of the ADT7481 is 0x4C. An ADT7481−1 with an SMBus address of 0x4B is also available. An ALERT output signals when the on-chip or remote temperature is outside the programmed limits. The THERM output is a comparator output that allows, for example, on/off control of a cooling fan. The ALERT output can be reconfigured as a second THERM output if required. Features 1 Local and 2 Remote Temperature Sensors 0.25°C Resolution/1°C Accuracy on Remote Channels 1°C Resolution/1°C Accuracy on Local Channel Extended, Switchable Temperature Measurement Range 0°C to 127°C (Default) or −64°C to +191°C 2-wire SMBus Serial Interface with SMBus ALERT Support Programmable Over/Undertemperature Lim...