MAX1668：Multichannel Remote/Local Temperature Sensors
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.
Key Features
| MAX1668, MAX1805, MAX1989: Typical Operating Circuit Applications/Uses
|
DataSheet
| title | Download file |
|---|---|
| MAX1668-MAX1989 Data Sheet | MAX1668-MAX1989.pdf |
Parametrics
| Part Number | Sensor Type | Alarm Output | Functions | Interface | Channels | Accuracy (±°C) | Parasite Pwr. | Temp. Resolution (bits) | Oper. Temp. (°C) | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|---|
| See Notes | |||||||||||
| MAX1668 | Remote | Alert | Remote & Local Sensor | 2-Wire/I2C/SMBus | Four | 2 | No | 8 | -55 to +125 | QSOP/16 | $4.04 @1k |
| MAX1805 | Two | QSOP/16 | $3.35 @1k | ||||||||
| MAX1989 | Four | QSOP/16 TSSOP/16 | $3.82 @1k | ||||||||
Design kits & evaluation modules
Quality and Environmental Data
Related Products
- MAX1668：Multichannel Remote/Local Temperature Sensors
- MAX1805：Multichannel Remote/Local Temperature Sensors
- MAX1669：Fan Controller and Remote Temperature Sensor with SMBus Serial Interface
- MAX1617：Remote/Local Temperature Sensor with SMBus Serial Interface
Ordering Information
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
|---|---|---|---|---|---|
| MAX1668EVKIT | Active | EVKIT; | -40°C to +85°C | See data sheet | |
| MAX1668MEE | No Longer Available | MAX1668MEE+ | QSOP,;16 pin;30.9 mm² | -40°C to +85°C | No |
| MAX1668MEE+ | Active | QSOP,;16 pin;30.9 mm² | -55°C to +125°C | Lead Free | |
| MAX1668MEE+T | Active | QSOP,;16 pin;30.9 mm² | -55°C to +125°C | Lead Free | |
| MAX1668MEE-T | No Longer Available | MAX1668MEE+T | QSOP,;16 pin;30.9 mm² | -40°C to +85°C | No |
- MAX1668-MAX1989.pdf MAX1989
- Temperature Sensor ICs Simplify Designs MAX6577
- Distributed Temperature Sensing Improves Reliability MAX6625
- MAX1668.pdf MAX1668
- MAX1668-MAX1989.pdf MAX1989
