Sunnyvale, Calif. - Maxim Integrated Products' MAX6646 and MAX6647 are precise two-channel digital temperature sensors that are said to measure the temperature of a remote thermal diode within plus/minus 1 degrees C. Both sensors include two programmable alarms and report temperature digitally over the SMBus.
The devices occupy different addresses on the SMBus to prevent conflicts in multiprocessor-based systems, according to Maxim. When used with the MAX6649, as many as three local and three remote temperatures can be monitored on a single SMBus line.
The sensors operate over a temperature range of -55 degrees C to 145 degrees C with performance optimized from 100 degrees C to 145 degrees C. They target multiprocessor systems, high-performance CPUs and graphics processors. To enhance system reliability, the MAX6646 and MAX6647 include SMBus timeout.
The devices' SMBus interface accepts standard system management write byte, read byte, send byte and receive byte commands to read the temperature data and to program the alarm thresholds. The data format is two's complement, 10 bits plus sign, with each LSB corresponding to 0.125 degrees C. Measurements can be done autonomously, with the conversion rate programmed by the user or in single-shot mode. At two conversions per second, the temperature sensors operate with a 250-microamp supply current. The supply voltage range is 3 to 5.5 volts.
The sensors are available in an eight-pin microMAX package. Prices start at $1.50 for volumes of 1,000 and up.
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