ADT7461

The ADT7461 is a dual-channel digital thermometer and under/over temperature alarm, intended for use in PCs and thermal management systems. It is pin and register compatible with the ADM1032. The ADT7461 has three additional features: series resistance cancellation, where up to 3 k (typical) of resistance in series with the temperature monitoring diode may be automatically cancelled from the temperature result, allowing noise filtering; configurable ALERT output; and an extended, switchable temperature measurement range.

The ADT7461 can measure the temperature of a remote ther-mal diode accurate to ±1°C, and the ambient temperature accu-rate to ±3°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 −55°C to +150°C. The ADT7461 communicates over a 2-wire serial interface compati-ble with system management bus (SMBus) standards. An ALERT output signals when the on-chip or remote temperature is out of range. The THERM output is a comparator output that allows on/off control of a cooling fan. The ALERT output can be reconfigured as a second THERM output if required.