19-1766; Rev 2; 5/03 Multichannel Remote/Local Temperature Sensors ________________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 syst...

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