_fan_board
version: 1.5 (Modified 6.3.2023)
Support #ecclima and I will support you with functional prototype
- Description:
- I2C driving FAN
- Connecting to the Raspberry Pi by mini_hub board (long range I2C connector),
- !!! Warning, It is not compatible with standard I2C !!!
- Power supply for fan:
- Set the internal VPP (VPP-Internal) by trimming from 5 to 24V (max 1A slow fuse) on the Raspberry Pi (step up voltage converter).
- Measure voltage at probe SV1 or between GND & VPP test pins at the PCB
- Use the TR1 trimmer resistor to adjust the voltage.
- external power supply is connected to Port X2. Pushing the connector into X2 will set off the internal step-up converter.
- FAN connector is connector J4, it is designed as 4 pin FAN with tachometer.
- Connecting to the Raspberry Pi by mini_hub board (long range I2C connector),
- The emc2301 fan management chip could lock the content of a register. Pushing the reset button will unlock the locked registers.
- two I2C buses could be connected to the board at Ports J1 & J2
- I2C communication ports:
- Port J1,J2: short range port for short cable max length of network: 30cm (tested 20 cm)
- Port J3: wide range I2C port for long cable, max length of network is 25m (tested 3m)is
- FAN port J4:
- The board is designed for a 4 pin FAN managed by PWM and with a tachometer (sensor).
- Alert pin of the EMC2301 chip on the board (also an ALERT LED diode)
- An I2C EEPROM chip from 24c01 to 24c1024 could be added to the bottom side of the board for internal use.
- I2C lines are voltage protected.
- Electromagnetic compatibility (EMC)
- I2C driving FAN
