SMBus TEMPERATURE SENSOR FOR USE WITH NEXT-GENERATION CPUs
SUNNYVALE, CA-December 28, 2000-Maxim Integrated Products introduces the MAX6654 SMBus temperature sensor. Building from the technology and industry acceptance of the MAX1617, the MAX6654 has the necessary accuracy and resolution for monitoring and protecting the next generation of CPUs.
The MAX6654 is a precise digital thermometer that measures both the temperature of a remote diode-connected transistor and its own die temperature. The remote channel can also be used to measure the die temperature of other ICs, such as microprocessors that contain an on-chip diode-connected transistor. Remote accuracy is ±1°C with no calibration required. Local temperature accuracy is ±1.3°C.
Key enhancements to the MAX6654 include extended temperature resolution and parasitic resistance cancellation. Extended resolution (0.125°C) allows precise monitoring of temperature variations, and parasitic resistance cancellation eliminates the measurement errors that can be caused by excessive resistance in series with the remote sensing junction.
Communication with the device is carried out via a 2-wire serial interface accepting standard System Management Bus (SMBus) protocol. This interface is used to program the configuration of the MAX6654, including data format, alarm thresholds, and conversion rate. In addition, the MAX6654 includes an SMBus timeout function to ensure that the SMBus is cleared in the event of a system communication error.
The MAX6654 is register-compatible and footprint-compatible with the industry-standard MAX1617A. Temperature data is available in the 7-bits-plus sign (1°C resolution) format of the MAX1617A or in an extended-resolution, 10-bits-plus sign (0.125°C resolution) format for both local and remote measurements.
Operating supply voltage range is from +3V to +5.5V. At the slowest temperature conversion rate, supply current is less than 70µA. Standby current is 10µA (max). Operating temperature range is from -55°C to +125°C. Prices start at $2.00 (1000-up, FOB USA).
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