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Data Sheet

FULL DATA SHEET (PDF, 240kB) Download   E-Mail

Description

The MAX6655/MAX6656 are precise voltage and temperature monitors. The digital thermometer reports the temperature of two remote sensors and its own die temperature. The remote sensors are diode-connected transistors—typically a low-cost, easily mounted 2N3906 PNP type—that replace conventional thermistors or thermocouples. Remote accuracy is ±1°C for multiple transistor manufacturers with no calibration necessary. The remote channels can also measure the die temperature of other ICs, such as microprocessors, that contain a substrate-connected PNP with its collector grounded and its base and emitter available for temperature-sensing purposes. The temperature is digitized with 11-bit resolution. The MAX6655/MAX6656 also measure their own supply voltage and three external voltages with 8-bit resolution. Each voltage input's sensitivity is set to give approximately 3/4-scale output code when the input voltage is at its nominal value. The MAX6655 operates at +5V supply and its second voltage monitor is 3.3V. The MAX6656 operates on a +3.3V supply and its second voltage monitor is 5V. The 2-wire serial interface accepts standard SMBus™ Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the alarm thresholds and to read data. The MAX6655/MAX6656 also provide SMBus alert response and timeout functions. The MAX6655/MAX6656 measure automatically and autonomously, with the conversion rate programmable. The adjustable rate allows the user to control the supply current. In addition to the SMBus active-low ALERT output, the MAX6655/MAX6656 feature an active-low OVERT output, which is used as a temperature reset that remains active only while the temperature is above the maximum temperature limit. The active-low OVERT output is optimal for fan control or for system shutdown.

Key Features		Applications/Uses
Three Temperature Channels Two Remote PN Junctions One Local Sensor Four Voltage Channels +12V, +5V, +3.3V, +2.5V Three External Monitors One Internal Supply Monitor 11-Bit, 0.125°C Resolution High Accuracy: ±1°C Over +60°C to +100°C Temperature Range Programmable Under/Over-Threshold Alarms Programmable Power-Saving Mode No Calibration Required SMBus/I²C-Compatible Interface Active-low OVERT Output for Fan Control and System Shutdown		Communication Systems Computers: Desktop, Workstation, Server Notebook Computers Servers Thin Clients Workstations

Diagram

Typical Application Circuit

Application Notes

Application Note 941: Circuit Monitors Board, Air, and CPU Temperature to Protect System from Overheating - MAX6655, MAX6656 Application Note 1057: Compensating for Ideality Factor and Series Resistance Differences between Thermal Sense Diodes - MAX6655, MAX6656

Evaluation Kits

MAX6655EVKIT, MAX6655EVSYS

Design Guides

TEMP SENSORS (PDF)

Reliability Reports

Show FIT data for: MAX6655 MAX6656 Reliability Report: MAX6655MEE.pdf MAX6656MEE.pdf

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-10 of 10
MAX6655	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6655MEE			QSOP;16 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E16-5*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX6655MEE-T			QSOP;16 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E16-5*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX6655MEE+T				0°C to +70°C	See data sheet
MAX6655MEE+			QSOP;16 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E16+5*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6656	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6656MEE-G05				0°C to +70°C	See data sheet
MAX6656MEE-TG05			QSOP;16 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E16-5*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX6656MEE+			QSOP;16 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E16+5*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6656MEE-T			QSOP;16 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E16-5*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX6656MEE			QSOP;16 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E16-5*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX6656MEE+T			QSOP;16 pin; Dwg: 21-0055H (PDF) Use pkgcode/variation: E16+5*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2001-09-06  Temperature Family by Product Type

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