MAX6658 Datasheet

• Dual Channel Measures Remote and Local Temperature
• 11-Bit, +0.125°C Resolution
• High Accuracy ±1°C (max) from +60°C to +100°C (Remote)
• No Calibration Required
• Programmable Under/Overtemperature Alarms
• Programmable Conversion Rate (0.0625Hz to 16Hz)
• SMBus/I²C*-Compatible Interface
• Two Alarm Outputs: active-low ALERT and active-low OVERT1 (MAX6658)
• Compatible with 65nm Process Technology(Y Versions)

• Computers: Desktop, Workstation, Server
• Notebook Computers
• Servers
• Workstations

The MAX6658 are precise, two-channel digital temperature sensors. Each accurately measures the temperature of its own die and one remote PN junction, and reports the temperature in digital form on a 2-wire serial interface. The remote junction can be a diode-connected transistor like the low-cost NPN type 2N3904 or 2N3906 PNP type. The remote junction can also be a common-collector PNP, such as a substrate PNP of a microprocessor.

The 2-wire serial interface accepts standard System Management Bus (SMBus™) commands such as Write Byte, Read Byte, Send Byte, and Receive Byte to read the temperature data and program the alarm thresholds and conversion rate. The MAX6658 can function autonomously with a programmable conversion rate, which allows the control of supply current and temperature update rate to match system needs. For conversion rates of 4Hz or less, the temperature is represented in extended mode as 10 bits + sign with a resolution of 0.125°C. When the conversion rate is faster than 4Hz, output data is 7 bits + sign with a resolution of 1°C. The MAX6658 also include an SMBus timeout feature to enhance system reliability.

Remote accuracy is ±1°C between +60°C and +100°C with no calibration needed. The MAX6658 measures temperatures from -55°C to +125°C.