Conclusion

The MAX6656 successfully meets the quality and reliability standards required of all Maxim products. In addition,

Maxim’s continuous reliability monitoring program ensures that all outgoing product will continue to meet Maxim’s quality

and reliability standards.

Table of Contents

I. ........Device Description

V. ........Quality Assurance Information

II. ........Manufacturing Information

VI. .......Reliability Evaluation

III. .......Packaging Information

IV. .......Die Information

......Attachments

I. Device Description

A. General

The MAX6656 is a precise voltage and temperature monitor. 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 MAX6656 also measure it’s 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 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 MAX6656 also provide SMBus alert response and

timeout functions. The MAX6656 measures automatically and autonomously, with the conversion rate

programmable. The adjustable rate allows the user to control the supply current.

In addition to the SMBus ALERT -bar output, the MAX6656 features an OVERT -bar output, which is used as a

temperature reset that remains active only while the temperature is above the maximum temperature limit. The

OVERT-bar output is optimal for fan control or for system shutdown.

B. Absolute Maximum Ratings

Item

Rating

VCC to GND

-0.3V to +6V

DXN_ to GND

-0.3V to +0.8V

SMBCLK, SMBDATA, ALERT, STBY, OVERT to GND

-0.3V to +6V

VIN1 to GND

-0.3V to +16V

VIN2 to GND

-0.3V to +6V

VIN3 to GND

-0.3V to +6V

All Other Pins to GND

-0.3V to (VCC + 0.3V)

SMBDATA, ALERT, OVERT Current

-1mA to +50mA

DXN_ Current

±1mA

Operating Temperature Range

-55°C to +125°C

Junction Temperature

+150°C

Storage Temperature Range

-65°C to +150°C

Lead Temperature (soldering, 10s)

+300°C

Continuous Power Dissipation (+70

°C)

16-Pin QSOP

667mW

Derates above +70

°C

16-Pin QSOP

8.3mW/

°C