TMP411 Remote Temperature Sensor IC Teatures Diode Non-Ideality Correction and Series Resistance Cancellation

TI’s TMP411 is a remote temperature sensor IC  with a built-in local temperature sensor, designed to monitor thermal diodes found in microprocessors, microprocessors, FPGAs and graphics processing units. TMP411 features unique diode non-ideality correction  and  programmable series resistance cancellation. The TMP411’s remote accuracy is ±1°C with no calibration needed. The Two-Wire serial interface is used to program the alarm thresholds and to read temperature data.

Basic Connection of TMP411 Remote Temperature Sensor

The TMP411 temperature sensor IC has multiple registers for holding configuration information, temperature measurement results, temperature comparator maximum/minimum limits, and status information. User-programmed high and low temperature limits stored in the TMP401 can be used to monitor local and remote temperatures to trigger an over/under temperature alarm (ALERT). Additional thermal limits can be programmed into the TMP411 and used to trigger another flag (THERM) that can be used to initiate a system response to rising temperatures. The TMP411 requires only a transistor connected between D+ and D− for proper remote temperature sensing operation. The SCL and SDA interface pins require pull-up resistors as part of the communication bus, while ALERT and THERM are open-drain outputs that also need pull−up resistors. ALERT and THERM may be shared with other devices if desired for a wired-OR implementation.

The TMP411 temperature sensor can be applied as thermal system management for a wide range of applications such as servers, industrial controllers, PC, notebook, and medical equipment. The temperature sensor is also suitable for central office telecom equipment, storage area networks, LCD/DLPTM/LCOS projectors, and processor/FPGA temperature monitoring.

Key features of TMP411 temperature sensor IC:

• ±1°C remote diode sensor
• ±1°C local temperature sensor
• Series resistance cancellation
• Programmable non-ideality factor
• Programmable resolution (9 - 12 bits)
• Programmable threshold limits
• Alert functions
• Diode fault detection
• Min and max temperature monitors
• Two-wire/SMBus serial interface

The TMP411 temperature sensor IC has programmable over- and under-temperature thresholds and alert pins that can be used for immediate response to potentially dangerous thermal environments. Programmable non-ideality factor correction can be used for any diode non-ideality factor associated with any processor.

Series resistance cancellation
Series resistance in an application circuit that typically results from PCB trace resistance and remote line length is automatically cancelled by the TMP411, preventing what would otherwise result in a temperature offset. A total of up to 3kΩ of series line resistance is cancelled by the TMP411, eliminating the need for additional characterization and temperature offset correction. See the two Remote Temperature Error vs Series Resistance typical characteristics curves for details on the effect of series resistance and power-supply voltage on sensed remote temperature error.

The TMP411 temperature sensor operates on a standard I2C/SMBus compatible, two-wire interface and offers 9- to 12-bit resolution over a temperature range of -40C to 125C, with a remote temperature range of up to 150C. In sleep mode, TMP411 reduce the current consumption to 10uA.

Key spec of TMP411 temperature sensor chip:

• Interface: Two-Wire SMBus
• Accuracy Over Temp Range: ±1 C Max
• Temp Resolution: 9 to 12 bits; -40C to 125C
• Supply Voltage: 3 to 5.5 Volts
• Iq: 400 uA
• Package: 8MSOP, SO-8

The TMP411 remote temperature sensor IC is available in MSOP-8 and SO-8 packages. Price start at $1.75 each in 1K qty.

TMP411 Temperature Sensor MSOP 8Pin Package

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