Details

---

BUY DS2401 https://www.utsource.net/itm/p/11250366.html

Parameter	Description	Value/Range
Device Type	Silicon Serial Number	One-Time Programmable (OTP)
Supply Voltage (VDD)	Operating supply voltage	3.0 V to 5.5 V
Supply Current (IDD)	Supply current during read/write operations	1 μA (typical)
Operating Temperature	Temperature range for normal operation	-40°C to +85°C
Serial Number Format	Unique 64-bit serial number	8-byte (64-bit)
Data Rate	Maximum data rate on the 1-Wire bus	16.3 kbps (standard mode)
1-Wire Bus	Communication protocol	1-Wire
Pin Count	Number of pins	3 (GND, DQ, VCC)
Package	Physical package type	SOIC-8, TSSOP-8, TO-92
Programming Voltage	Voltage required for programming the device	12 V (programming)
Programming Time	Time required to program the device	10 ms (typical)
Write Protection	Protection against accidental re-programming	Write-protected after programming

Instructions for Using the DS2401

1. Powering the Device:

   • Connect the VCC pin to a supply voltage between 3.0 V and 5.5 V.
   • Connect the GND pin to ground.

2. Connecting to the 1-Wire Bus:

   • Connect the DQ pin to the 1-Wire bus.
   • The 1-Wire bus requires a pull-up resistor (typically 4.7 kΩ) connected between the DQ line and VCC.

3. Reading the Serial Number:

   • Initialize the 1-Wire master to start communication.
   • Send the Reset command (0xF0) to reset the 1-Wire bus.
   • Send the Read ROM command (0x33) to read the 64-bit serial number from the DS2401.
   • The 1-Wire master will receive the 8-byte serial number in response.

4. Programming the Device:

   • Apply 12 V to the VCC pin to enter programming mode.
   • Send the Write Scratchpad command (0x0F) followed by the 64-bit serial number to be programmed.
   • Send the Copy Scratchpad command (0x55) to copy the scratchpad contents to the EEPROM.
   • Wait for the programming time (10 ms typical) before sending any further commands.

5. Write Protection:

   • Once the device is programmed, it becomes write-protected and cannot be reprogrammed.
   • Verify the programmed serial number using the Read ROM command to ensure correct programming.

6. Handling and Storage:

   • Store the device in a dry environment to prevent moisture damage.
   • Handle the device with care to avoid static discharge, which can damage the internal circuitry.

For more detailed information, refer to the DS2401 datasheet provided by Maxim Integrated.

(For reference only)