MAX1619

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

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


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Description

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.
MAX1619: Typical Operating Circuit MAX1619: Typical Operating Circuit Enlarge+

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

Applications/Uses

  • Central Office Telecom Equipment
  • Computers: Desktop, Workstation, Server
  • Industrial Controls
  • LAN Servers
  • Multichip Modules
  • Smart Battery Packs/Chargers
  • Test and Measurement Equipment

See parametric specs for Temperature Sensors (113)


Part NumberSensor TypeAlarm OutputFunctionsInterface#ChannelsAccuracy
(±°C)
Parasite Pwr.Temp. Thresh.Temp. Resolution
(bits)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
(See Notes)
MAX1619 Remote
Alert
Overt
Remote & Local Sensor2-Wire/I2C/SMBusOne3NoProgrammable8-40 to +125
QSOP/16
$5.49 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: MAX1619.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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