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MAX6648：Precision SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms

The MAX6648/MAX6692 are precise, two-channel digital temperature sensors. They accurately measure the temperature of their own die and a remote PN junction, and report the temperature in digital form using a 2-wire serial interface. The remote PN junction is typically the emitter-base junction of a common-collector PNP on a CPU, FPGA, or ASIC. The 2-wire serial interface accepts standard System Management Bus (SMBus™) write byte, read byte, send byte, and receive byte commands to read the temperature data and to program the alarm thresholds. To enhance system reliability, the MAX6648/MAX6692 include an SMBus timeout. A fault queue prevents the active-low ALERT and active-low OVERT outputs from setting until a fault has been detected one, two, or three consecutive times (programmable). The MAX6648/MAX6692 provide two system alarms: active-low ALERT and active-low OVERT. Active-low ALERT asserts when any of four temperature conditions are violated: local overtemperature, remote overtemperature, local undertemperature, or remote undertemperature. Active-low OVERT asserts when the temperature rises above the value in either of the two active-low OVERT limit registers. The active-low OVERT output can be used to activate a cooling fan, or to trigger a system shutdown. Measurements can be done autonomously, with the conversion rate programmed by the user, or in a single-shot mode. The adjustable conversion rate allows the user to optimize supply current and temperature update rate to match system needs. Remote accuracy is ±0.8°C maximum error between +25°C and +125°C with no calibration needed. The MAX6648/MAX6692 operate from -55°C to +125°C, and measure temperatures between 0°C and +125°C. The MAX6648 is available in an 8-pin µMAX® package, and the MAX6692 is available in 8-pin µMAX and SO packages.

Key Features Dual Channel: Measures Remote and Local Temperature 0.125°C Resolution High Accuracy: ±0.8°C (max) from +25°C to +125°C (Remote), and ±2°C (max) from +60°C to +100°C (Local) Two Alarm Outputs: Active-Low ALERT and Active-Low OVERT Two Default Active-Low OVERT Thresholds Available MAX6648: +110°C MAX6692: +85°C Programmable Conversion Rate SMBus-Compatible Interface SMBus Timeout Programmable Under/Overtemperature Alarm Thresholds Compatible with 90nm, 65nm, and 45nm Process Technology

MAX6648, MAX6692: Typical Operating Circuit Applications/Uses Desktop Computers Multichip Modules Notebook Computers Servers Test and Measurement Equipment Thin Clients Workstations

DataSheet

Parametrics

Design kits & evaluation modules

• MAX6692EVKIT
• MAX6692EVSYS

Quality and Environmental Data

• MAX6648.pdf

Related Products

• MAX6657：±1°C, SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms

Ordering Information