Details

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BUY DK485 https://www.utsource.net/itm/p/12610874.html

Parameter	Description
Part Number	DK485
Type	RS-485 Transceiver
Operating Voltage (Vcc)	3.0V to 5.5V
Data Rate	Up to 10 Mbps
Driver Output Current (Iodc)	卤250mA (max)
Receiver Input Sensitivity (Vin)	卤200mV (min)
Operating Temperature	-40掳C to +85掳C
Storage Temperature	-65掳C to +150掳C
ESD Protection	卤15kV (Human Body Model)
Package	SOIC-8, DIP-8

Instructions for Use

1. Power Supply:

   • Connect Vcc to the positive power supply (3.0V to 5.5V).
   • Connect GND to the system ground.

2. Signal Lines:

   • Connect the differential data lines A and B to the corresponding pins on the RS-485 network.
   • Ensure proper termination resistors (120惟) are used at the ends of the bus to prevent signal reflections.

3. Control Lines:

   • DE (Driver Enable): Set to high to enable the driver (transmit mode).
   • RE (Receiver Enable): Set to low to enable the receiver (receive mode).
   • DE and RE can be tied together for half-duplex operation or controlled separately for full-duplex operation.

4. Data Lines:

   • RO (Receiver Output): Connect to the microcontroller or other receiving device.
   • DI (Driver Input): Connect to the microcontroller or other transmitting device.

5. Termination:

   • Use 120惟 termination resistors at both ends of the RS-485 bus to match the characteristic impedance of the cable and reduce signal reflections.

6. Grounding:

   • Ensure a common ground between all devices on the RS-485 network to maintain signal integrity.

7. ESD Protection:

   • Handle the DK485 with ESD precautions to avoid damage from static electricity.

8. Layout Considerations:

   • Keep signal traces as short as possible to minimize noise and interference.
   • Use a ground plane to provide a low-impedance return path for signals.

9. Testing:

   • Test the communication by sending and receiving data between two devices connected to the RS-485 network.
   • Verify the correct operation of the DE and RE control lines to ensure proper transmit and receive functions.

(For reference only)