GXTR7718

1 Electrical Characteristics

• Supply Voltage: 1.62V ~ 5.5V

• Temperature Measurement Range: -50℃ ~ +125℃

• Temperature Accuracy:

Local Channel: < ±0.5℃ (-40℃ ~ +125℃)

Remote Channel: < ±1℃ (-40℃ ~ +125℃)

• Temperature Resolution (Local / Remote): 12bit / 0.0625℃ (1LSB)

• Low Measurement Power Consumption:

2.4μA (0.0625Hz Continuous Conversion Mode)

7.5μA (1Hz Continuous Conversion Mode)

89.3μA (16Hz Continuous Conversion Mode)

650nA (Shutdown Mode)

• Compatible with 1.2V, 1MHz SMBus, I²C communication protocols

• Remote Temperature Diode Fault Detection

• Programmable Digital Filter Output for Remote Temperature

• Remote Temperature Series Resistance Cancellation

• Remote Temperature Offset Correction

• Alarm Threshold Programmable via Pull-up Resistor on Alarm Pin

• Package Information:

2 Applications

• Notebook Computers

• Rack Server Motherboards

• Smart Network Interface Cards (NIC)

• Small Cellular Base Stations

• Base Band Unit (BBU)

• FPGA Temperature Monitoring

3 Chip Overview

The GXTR7718 is a high-precision local and remote temperature sensor with typical temperature accuracy less than ±1℃. The remote temperature sensing input can be connected to a diode-connected BJT (e.g., 2N3904 / 2N3906), replacing traditional thermistors or thermocouples. It can also connect to the substrate thermal transistor or diode integrated inside a microprocessor, microcontroller or FPGA to monitor the die temperature of the IC.

The GXTR7718 supports SMBus and I²C communication protocols. Its logic high level can be as low as 1.0V, independent of the chip supply voltage. This enables direct communication with 1.2V low-voltage MCUs without additional low-voltage supply or level-shifting devices. The GXTR7718 features series resistance cancellation, which automatically eliminates temperature errors caused by series resistance up to 1kΩ, allowing greater flexibility for remote temperature diode routing. Programmable remote temperature offset correction enables users to calibrate remote temperature data as required.

The GXTR7718 includes four models: GXTR7718AU ~ GXTR7718DU. These models differ only in SMBus and I²C slave addresses; all other functions are identical.

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