MAX1668/MAX1805/MAX1989 Multichannel Remote/Local Temperature Sensors Data Sheet
The MAX1668/MAX1805/MAX1989 are precise multi-channel 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 for-mat 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.
●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
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MAX1668 、 MAX1805 、 MAX1989 、 MAX1668MEE 、 MAX1805MEE 、 MAX1989MEE 、 MAX1989MUE |
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[ Desktop ][ Notebook Computers ][ LAN Servers ][ Industrial Controls ][ Central-Office Telecom Equipment ][ Test and Measurement ][ Multichip Modules ] |
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Datasheet |
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Please see the document for details |
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QSOP;TSSOP |
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English Chinese Chinese and English Japanese |
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5/03 |
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Rev 2 |
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19-1766 |
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723 KB |
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