Remote/local Temperature Sensor With Smbus Serial Interface Integrated Products

The MAX1617A (patents pending) is a precise digital ther- mometer that reports the temperature of both a remote Sensor and its own package. The remote Sensor is a diode-connected transistortypically a low-cost, easily mounted 2N3904 NPN typethat replaces conventional thermistors or thermocouples. Remote accuracy is 3C for multiple Transistor manufacturers, with no calibration needed. The remote channel CAN also measure the die temperature of other ICs, such as Microprocessors that contain an on-chip, diode-connected Transistor The 2-wire serial Interface accepts standard System Management Bus (SMBus) Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the alarm thresholds and to read temperature data. The data format is 7 bits plus sign, with each bit corresponding to 1C, in twos complement format. Measurements CAN be done automatically and autonomously, with the conversion rate programmed by the user or programmed to operate in a single-shot mode. The adjustable rate allows the user to control the supply-current drain. The MAX1617A is nearly identical to the popular MAX1617 but has improved SMBus Timing specifications, improved bus collision immunity, software manufacturer and device identification available via the serial Interface and a power- on reset function that CAN force a reset of the slave address via the serial Interface By Maxim Integrated Products