MAX1805MEE

Thermal Management Overview

The MAX1805MEE is a multichannel digital thermometer in a 16-pin QSOP package. It measures one local and two remote diode-connected transistor temperatures with an operating range of -55°C to +125°C. The device features an SMBus interface, 8-bit resolution, and ±3°C accuracy across the full temperature range. Supply voltage ranges from 3V to 5.5V, with standby current typically at 3µA.

Thermal Management Feature Summary

• Supports simultaneous measurement of one local and two remote channels using standard diode-connected transistors
• Incorporates a 2-wire SMBus serial interface for data retrieval and alarm threshold programming
• Features programmable overtemperature and undertemperature alarms with ALERT interrupt output
• Provides hardware or software standby mode to minimize power consumption while retaining configuration data

Thermal Management Applications

• Desktop and notebook computers
• LAN servers
• Industrial controls
• Central-office telecom equipment
• Test and measurement systems

Thermal Management Procurement Notes

Verify the specific suffix MEE corresponds to the 16-pin QSOP package variant. Confirm RoHS compliance status as indicated by the '+' designation. Ensure the ordering documentation matches the exact part number to avoid pinout discrepancies with similar MAX1668 or MAX1989 models.

Thermal Management Selection Notes

Select this component when monitoring multiple thermal zones using external NPN/PNP transistors. The dual remote channels allow tracking of heatsink or board temperatures alongside internal die readings. Verify that the host system supports SMBus protocols for register access and alarm handling.

Thermal Management Part Context

This device belongs to the MAX1668/MAX1805/MAX1989 family of precision digital thermometers. While sharing the same interface and core architecture, the MAX1805 specifically provides two remote channels compared to the four available in the MAX1668 and MAX1989 variants.

Thermal Management Replacement Considerations

MAX1668MEE

Thermal Management FAQ

What type of sensors are used for remote temperature measurement?

Remote sensors utilize diode-connected transistors, such as low-cost 2N3904 NPN types, which replace conventional thermistors or thermocouples.

How is the temperature data formatted?

Data is transmitted in 7 bits plus sign using two’s-complement format, where each bit corresponds to 1°C.