Topology:	ADC, Fan Control, Register Bank
Supplier Device Package:	20-QFN (4x4)
Package / Case:	20-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply:	3.135 V ~ 3.465 V
Output Fan:	Yes
Output Alarm:	Yes
Output Type:	I²C/SMBus
Series:	--
Accuracy:	--
Sensing Temperature:	--
Sensor Type:	--
Function:	Hardware Monitor
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tube

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PMIC - Thermal Management

NCT7802Y Application Field and Working Principle

The NCT7802Y is a Single Channel Temperature Sensor and Thermal Monitor with I2C and Fan Speed Control Outputs. It is a device manufactured by On Semiconductor. This device is widely used in consumer and industrial applications. The purpose of this application field is to measure and control the thermal condition of systems and protect them from too-high temperature, which can potentially cause damage to the system.The NCT7802Y has many features including multiple thermal input channels, I2C communication interface, fan speed control, temperature sensing, high accuracy and a low power consumption. The NCT7802Y device can detect temperatures up to 125°C with a resolution of 0.25°C. It also has an internal digital temperature compensation system to provide greater accuracy when measuring temperature. The NCT7802Y can be used for different types of thermal management applications such as CPU and system fans, temperature monitoring of systems, and temperature monitoring of audio equipment. It is also capable of controlling the speed of a three-wire DC brush fan. The working principle of the NCT7802Y is based on an integrated analog to digital converter (ADC). This ADC is connected to multiple thermal input channels to measure the temperature. The device also contains an I2C interface which can be used to communicate with other devices in order to control the fan speed and temperature settings. Additionally, the device has a temperature threshold setting that can be used to set a certain temperature at which the fan speed is changed.The NCT7802Y also contains an internal digital temperature compensation system which uses a thermistor to measure the ambient temperature. This thermistor is connected to the ADC to measure the temperature and then the ADC will convert the analog temperature readings into a digital output. This digital output is then used to control the fan speed or to alert an external system in order to take corrective action.In conclusion, the NCT7802Y is an efficient and accurate device that is able to measure temperature and control the fan speed in order to protect systems from too-high temperatures. The fan speed can be controlled via I2C communication interface and its digital temperature compensation system provides better accuracy. This makes the NCT7802Y device ideal for applications such as CPU and system fan control, temperature monitoring, and audio equipment temperature monitoring.

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