+145°C PRECISION SMBus-COMPATIBLE REMOTE/LOCAL TEMPERATURE SENSORS HAVE OVERTEMPERATURE ALARMS FOR MULTIPROCESSOR SYSTEMS
SUNNYVALE, CA-July 22, 2003-Maxim Integrated Products
(NASDAQ: MXIM) introduces the MAX6646/MAX6647, precise two-channel digital temperature sensors that accurately measure the temperature of a remote thermal diode within ±1°C and its own die to within ±2°C. Both temperature sensors include two programmable alarms and report temperature in digital form over the SMBus interface™. These devices occupy different addresses on the SMBus to prevent conflicts in multiprocessor-based systems. When used in conjunction with the MAX6649, up to three local and three remote temperatures can be monitored on a single SMBus line. These devices operate over a temperature range of -55°C to +145°C with performance optimized from +100°C to +145°C. The MAX6646/MAX6647 are ideal for multiprocessor systems, high-performance CPUs, and graphic processors.
To enhance system reliability, the MAX6646/MAX6647 include SMBus timeout. When a fault queue is enabled, it prevents the ALERT-bar and OVERT-bar outputs from settling until a fault has been detected three consecutive times. The programmable conversion rate allows the user to optimize supply current and temperature-update rate to match system needs.
The MAX6646/MAX6647 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°C. Measurements can be done autonomously, with the conversion rate programmed by the user or in a single-shot mode.
At two conversions per second, these temp sensors operate with a 250µA supply current. The MAX6646/MAX6647 have a supply voltage range of 3V to 5.5V and are available in a 8-pin µMAX package. Prices start at $1.50 (1000-up, FOB USA).
SMBus is a trademark of Intel Corporation.
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