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MAX1668, MAX1805, MAX1989
Multichannel Remote/Local Temperature Sensors
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Status
Active: In Production.
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.
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Data Sheet
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An evaluation kit is available: MAX1668EVSYS
Key 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
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Applications/Uses
- Central Office Telecom Equipment
- Desktop/Notebook Computers
- Industrial Controls
- LAN Servers
- Multichip Modules
- Test and Measurement Equipment
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Key Specifications:
| Temperature Sensors |
| Part Number |
Sensor Type |
Alarm Output |
Functions |
Interface |
Remote Chan. |
Accuracy
(±°C) |
Parasite Pwr. |
Temp. Resolution
(bits) |
Oper. Temp.
(°C) |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| max w/pins |
See Notes |
| MAX1668 |
Remote |
Alert |
Remote & Local Sensor |
2-Wire/I2C/SMBus |
Quad |
2 |
No |
8 |
-55 to +125 |
30.9 |
$4.32 @1k |
| MAX1805 |
Dual |
30.9 |
$3.93 @1k |
| MAX1989 |
Quad |
33.4 |
$4.60 @1k |
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See All Temperature Sensors (103)
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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 prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
More Information
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Information Index
Document Ref.: 19-1766
Rev 2;
2003-06-06
This page last modified: 2010-05-10
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