Fan 2 click

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  • MIKROE-2708
  • MIKROE-2708
Fan 2 click  carries the  MAX31760  precision fan-speed controller. It can...more
Product information "Fan 2 click"

Fan 2 click carries the MAX31760 precision fan-speed controller. It can measure temperature and adjust the fan speed to keep the temperature at the same level. Fan 2 click can also control two fans at the same time. 

The click is designed to run on either 3.3V or 5V power supply. It communicates with the target microcontroller over I2C interface, with additional functionality provided by the following pins on the mikroBUS™ line: INT, AN, RST, CS.

For example, you can set the limit at 25°C and if the temperature goes over that the click will activate the fan; it will keep working until the temperature is 25°C again.

MAX31760 controller features

The MAX31760 integrates temperature sensing along with precision PWM fan control. It accurately measures its local die temperature and the remote temperature of a discrete diode-connected transistor, such as a 2N3906, or a thermal diode commonly found on CPUs, graphics processor units (GPUs), and other ASICs. Multiple temperature thresholds, such as local high/overtemperature (OT) and remote high/overtemperature, can be set by an I2C-compatible interface.

Fan speed is controlled based on the temperature reading as an index to a 48-byte lookup table (LUT) containing user-programmed PWM values. The flexible LUT-based architecture enables the user to program a smooth nonlinear fan speed vs. temperature transfer function to minimize acoustic fan noise. Two tachometer inputs allow measuring the speeds of two fans independently.  

See the datasheet for more information. 

How it works

The click carries a 10-pole terminal block, that allows easy connection for pairs of two, three or four wire DC fans, on the standard way of connection via PWM, TACH, GND, VFAN lines.

A single onboard jumper setting enables 2 or 3 wire fan connection. In addition, there are two points (DXP, DXN) on the same terminal for external temperature sensor connection. The click communicates with the MCU over data interface voltage level of 3.3V only.


Type DC
Applications For speed control of DC fans (5/12 VDC) than could be found on PCs, servers, network equipment, set-top-box and digital-video-recorder devices, and many other consumer electronics, or storage containers like RAID systems etc.
On-board modules MAX31760 precision fan-speed controller
Key Benefits Temperature sensor
Interface I2C
Input Voltage 3.3V or 5V
Click board size M (42.9 x 25.4 mm)

Pinout diagram

This table shows how the pinout on Fan 2 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

NotesPinMikrobus logo.pngPinNotes
#ALERT, active low, local/remote overtemperature fault ALR 1 AN PWM 16 NC  
#SHDN, active low overtemperature shutdown fault SHD 2 RST INT 15 INT #INT, active low, at least one of the three faults has occurred  
#FANFAULT, active low, fan speed fault FF 3 CS TX 14 NC  
  NC 4 SCK RX 13 NC  
  NC 5 MISO SCL 12 SCL SCL I2C line
  NC 6 MOSI SDA 11 SDA SDA I2C line
Power supply +3.3V 7 3.3V 5V 10 +5V Power supply
Ground GND 8 GND GND 9 GND Ground

Jumpers and settings

DesignatorNameDefault PositionDefault OptionDescription
J1 FAN SEL ON or OFF (not specified) 2/3 or 4 wire fan When in place (ON position) it enables two or three wire fan usage, in otherwise (OFF - unconnected) it enables 4-wire fan applications.


Code examples for Fan 2 click, written for MikroElektronika hardware and compilers are available on Libstock.

Code snippet

The following code snippet shows 3 functions from the example that control the fan speed. The first one initializes Fan 2 click to work automatically, depending on the temperature, while the second and third one demonstrates manual control.

01 //sets fan to automatic control (default), and fills the look-up table
02 void Fan_2_Init()
03 {
04     FAN2_I2CdriverInit( I2CM1_Set_Slave_Address, 0, 0, I2CM1_Write_Bytes, I2CM1_Read_Bytes);
05     FAN2_sendCommand(_FAN2_CONTROL_REGISTER_1, _FAN2_CMD1_DEFAULT);
06     FAN2_sendCommand(_FAN2_CONTROL_REGISTER_2, _FAN2_CMD2_DEFAULT);
08     FAN2_setupLUT(LUTSettings);
09 }
11 //sets fan to manual control
12 void Fan_2_Manual()
13 {
14     FAN2_sendCommand(_FAN2_CONTROL_REGISTER_1, _FAN2_CMD1_DEFAULT);
17 }
19 //turns fan on and off
20 void Fan_2_Task()
21 {
23     delay_ms (5000);
25     delay_ms (5000);
26 }


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