MAX6642ATT90+T

The MAX6642ATT90+T is a ±1°C, SMBus compatible remote/local temperature sensor with overtemperature alarm in 6 pin TDFN package. This precise, two channel digital temperature sensor accurately measures temperature of its own die and remote PN junction and reports temperature data over 2-wire serial interface. The remote PN junction is typically a substrate PNP transistor on die of CPU, ASIC, GPU or FPGA. The 2-wire serial interface accepts standard system management bus (SMBus), write byte, read byte, send byte and receive byte commands to read temperature data and to program alarm thresholds. To enhance system reliability, the MAX6642 includes SMBus timeout. The temperature data format is 10bit with LSB corresponding to 0.25°C. The active-low ALERT output asserts when local or remote overtemperature thresholds are violated. Remote accuracy is ±1°C maximum error between 60°C and 100°C. The MAX6642 operates from -40°C to +125°C and measures remote temperatures between 0°C and +150°C.

• Supply voltage range from 3V to 5.5V
• Integrated temperature sensor enables simultaneous dual temperature (remote and local) measurements
• Local temperature error of ±2°C at TA = 60°C to 100°C and ±3°C at TA = 0°C to +125°C (VCC = 3.3V)
• 10bit, 0.25°C temperature resolution
• Dual zone monitoring automates over temperature alarms
• Programmable remote/local temperature thresholds
• Low thermal mass reduces measurement latency, SMBus/I2C address hardwired
• ±0.2°C/V supply sensitivity of temperature error
• Standby supply current of 3μA and operating current of 0.5mA

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