MAX6658：±1°C, SMBus-Compatible Remote/Local Temperature Sensors with Overtemperature Alarms

The MAX6657/MAX6658/MAX6659 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 MAX6657/MAX6658/MAX6659 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 MAX6657/MAX6658/MAX6659 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 MAX6657 measures temperatures from 0°C to +125°C and the MAX6658/MAX6659 from -55°C to +125°C. The MAX6659 has the added benefit of being able to select one of three addresses through an address pin, and a second over-temperature alarm pin for greater system reliability.

Key Features

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 (MAX6657 and MAX6658)
Three Alarm Outputs: active-low ALERT, active-low OVERT1, and active-low OVERT2 (MAX6659)
Compatible with 65nm Process Technology(Y Versions)

MAX6657, MAX6658, MAX6659: Typical Operating Circuit

Applications/Uses

Computers: Desktop, Workstation, Server
Notebook Computers
Servers
Workstations

DataSheet

title	Download file
MAX6657-MAX6659 Data Sheet	MAX6657-MAX6659.pdf

Parametrics

Part Number	Sensor Type	Alarm Output	Functions	Interface	Channels	Accuracy (±°C)	Parasite Pwr.	Temp. Thresh.	Temp. Resolution (bits)	Multi Droppable	Oper. Temp. (°C)	Package/Pins	Budgetary Price
Part Number	Sensor Type	Alarm Output	Functions	Interface	Channels	Accuracy (±°C)	Parasite Pwr.	Temp. Thresh.	Temp. Resolution (bits)	Multi Droppable	Oper. Temp. (°C)	Package/Pins	See Notes
MAX6657	Remote	Alert Overt	Remote & Local Sensor	2-Wire/I2C/SMBus	One	1	No	Programmable	11	Yes	-55 to +125	SOIC(N)/8	$2.17 @1k
MAX6658												SOIC(N)/8	$2.17 @1k
MAX6659												QSOP/16	$2.46 @1k

Quality and Environmental Data

MAX6658.pdf

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX6658MSA	No Longer Available	MAX6658MSA+	SOIC(N),;8 pin;30.9 mm²	-55°C to +125°C	No
MAX6658MSA+	Active		SOIC(N),;8 pin;30.9 mm²	-55°C to +125°C	Lead Free
MAX6658MSA+T	Active		SOIC(N),;8 pin;30.9 mm²	-55°C to +125°C	Lead Free
MAX6658MSA-T	No Longer Available	MAX6658MSA+T	SOIC(N),;8 pin;30.9 mm²	-55°C to +125°C	No