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Key Features
Applications/Uses
Parametric specs for Temperature Sensors
| Sensor Type | Remote |
| # Channels | Two |
| Interface | 2-Wire/I2C/SMBus |
| Alarm Output | Alert |
| Functions | Remote & Local Sensor |
| Accuracy (±°C) | 2 |
| Parasite Pwr. | No |
| Temp. Resolution (bits) | 8 |
| Oper. Temp. (°C) | -55 to +125 |
| Package/Pins | QSOP/16 |
| Budgetary Price (See Notes) | 3.73 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | Multichannel Remote/Local Temperature Sensors | Jun 06, 2003 |
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Parameters
Parametric specs for Temperature Sensors
| Sensor Type | Remote |
| # Channels | Two |
| Interface | 2-Wire/I2C/SMBus |
| Alarm Output | Alert |
| Functions | Remote & Local Sensor |
| Accuracy (±°C) | 2 |
| Parasite Pwr. | No |
| Temp. Resolution (bits) | 8 |
| Oper. Temp. (°C) | -55 to +125 |
| Package/Pins | QSOP/16 |
| Budgetary Price (See Notes) | 3.73 |
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
Applications/Uses
- Central Office Telecom Equipment
- Desktop/Notebook Computers
- Industrial Controls
- LAN Servers
- Multichip Modules
- Test and Measurement Equipment
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 transistorstypically low-cost, easily mounted 2N3904 NPN typesthat 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.
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.
Technical Docs
| Data Sheet | Multichannel Remote/Local Temperature Sensors | Jun 06, 2003 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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