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MAX1619：Remote/Local Temperature Sensor with Dual Alarm Outputs and SMBus Serial Interface

Alarm Outputs Manage System Temperature to Ensure Performance, Reliability and Protection

The MAX1619 is a precise digital thermometer that reports the temperature of both a remote sensor and its own package. The remote sensor is a diode-connected transistor-typically a low-cost, easily mounted 2N3904 NPN type-that replaces conventional thermistors or thermocouples. Remote accuracy is ±3°C for multiple transistor manufacturers, with no calibration needed. The remote channel can also measure the die temperature of other ICs, such as microprocessors, that contain an on-chip, diode-connected transistor. The 2-wire serial interface accepts standard System Management Bus (SMBus™) Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the alarm thresholds and to read temperature data. The data format is 7 bits plus sign, with each bit corresponding to 1°C, in two's complement format. Measurements can be done automatically and autonomously, with the conversion rate programmed by the user or programmed to operate in a single-shot mode. The adjustable rate allows the user to control the supply-current drain. The MAX1619 is nearly identical to the popular MAX1617A, with the additional feature of an overtemperature alarm output (active-low OVERT) that responds to the remote temperature; this is optimal for fan control.

Key Features Two Channels Measure Both Remote and Local Temperatures No Calibration Required SMBus 2-Wire Serial Interface Programmable Under/Overtemperature Alarms Active-Low OVERT Output for Fan Control Supports SMBus Alert Response Supports Manufacturer and Device ID Codes Accuracy ±2°C (+60°C to +100°C, local) ±3°C (-40°C to +125°C, local) ±3°C (+60°C to +100°C, remote) 3µA (typ) Standby Supply Current 70µA (max) Supply Current in Auto-Convert Mode +3V to +5.5V Supply Range Write-Once Protection Small 16-Pin QSOP Package

MAX1619: Typical Operating Circuit Applications/Uses Central Office Telecom Equipment Computers: Desktop, Workstation, Server Industrial Controls LAN Servers Multichip Modules Smart Battery Packs/Chargers Test and Measurement Equipment

DataSheet

Parametrics

Quality and Environmental Data

• MAX1619.pdf

Related Products

• MAX1617A：Remote/Local Temperature Sensor with SMBus Serial Interface

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