MIKROE-2708

      Fan 2 click PID: MIKROE-2708       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 diodeconnected 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.  https://datasheets.maximintegrated.com/en/ds/MAX31760.pdf 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. Specifications 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). Notes  Pin  Pin Notes    #ALERT, active low, local/remote  overtemperature fault  ALR  1 AN  PWM 16 NC    #SHDN, active low overtemperature  SHD  2 RST  INT  shutdown fault  15 INT  #FANFAULT, active low, fan speed  fault  14 NC  FF  3 CS  TX  #INT, active low, at least one of the  three faults has occurred      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 Designator  Name  J1  FAN  SEL  Default  Position  Default  Option  ON or OFF (not  2/3 or 4  specified)  wire fan  Description  When in place (ON position) it enables two or three wire  fan usage, in otherwise (OFF ‐ unconnected) it enables 4‐ wire fan applications.  Programming 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); 07 FAN2_sendCommand(_FAN2_CONTROL_REGISTER_3, _FAN2_CMD3_DEFAULT | _FAN2_CMD3_INSTANT_RAMP); 08 FAN2_setupLUT(LUTSettings); 09 } 10 11 //sets fan to manual control 12 void Fan_2_Manual() 13 { 14 FAN2_sendCommand(_FAN2_CONTROL_REGISTER_1, _FAN2_CMD1_DEFAULT); 15 FAN2_sendCommand(_FAN2_CONTROL_REGISTER_2, _FAN2_CMD2_DEFAULT | _FAN2_CMD2_DIRECT_CONTROL); 16 FAN2_sendCommand(_FAN2_CONTROL_REGISTER_3, _FAN2_CMD3_DEFAULT | _FAN2_CMD3_INSTANT_RAMP); 17 } 18 19 //turns fan on and off 20 void Fan_2_Task() 21 { 22 FAN2_sendCommand(_FAN2_DIRECT_CONTROL_REGISTER, _FAN2_DUTYCYCLE_100); 23 delay_ms (5000); 24 FAN2_sendCommand(_FAN2_DIRECT_CONTROL_REGISTER, _FAN2_DUTYCYCLE_0); 25 delay_ms (5000); 26 }                                                         https://shop.mikroe.com/fan‐2‐click 8‐2‐17