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MFG:MAXIM  Package Cooled:00+  D/C:SSOP-16  

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Part Number: MAX1668

 

MFG: MAXIM

Package Cooled: 00+

D/C: SSOP-16

Description: The MAX1668/MAX1805/MAX1989 are precise multichannel digital thermometers that report the temperature ...


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MAX1668 General Description


The MAX1668/MAX1805/MAX1989 are precise multichannel digital thermometers that report the temperature of all remote sensors and their own packages. The remote sensors are diode-connected transistors-typically low-cost, easily mounted 2N3904 NPN types-that replace conventional thermistors or thermocouples. Remote accuracy is ±3°C for multiple transistor manufacturers, with no calibration needed. The remote channels 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.

The MAX1668/MAX1805/MAX1989 are available in small, 16-pin QSOP surface-mount packages. The MAX1989 is also available in a 16-pin TSSOP.

MAX1668 Maximum Ratings

VCC to GND............................................................-0.3V to +6V
DXP_, ADD_, STBY to GND........................-0.3V to (VCC + 0.3V)
DXN_ to GND .....................................................-0.3V to +0.8V
SMBCLK, SMBDATA,ALERT to GND..........................-0.3V to +6V
SMBDATA, ALERT Current .................................-1mA to +50mA
DXN_ Current...................................................................±1mA
Continuous Power Dissipation (TA = +70°C)
    QSOP (derate 8.30mW/°C above +70°C) ................667mW
    TSSOP (derate 9.40mW/°C above +70°C) ...............755mW
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

MAX1668 Features

Multichannel
    4 Remote, 1 Local (MAX1668/MAX1989)
    2 Remote, 1 Local (MAX1805)
No Calibration Required
SMBus 2-Wire Serial Interface
Programmable Under/Overtemperature Alarms
Supports SMBus Alert Response
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
700µA (max) Supply Current
Small, 16-Pin QSOP/TSSOP Packages

MAX1668 Typical Application

Desktop and Notebook Computers
LAN Servers
Industrial Controls
Central-Office Telecom Equipment
Test and Measurement
Multichip Modules

MAX1668 Connection Diagram

MAX1668 Connection Diagram

MAX1668 datasheet

MAX1668
PDF/DataSheet Download

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