Technical Analysis of Industrial-Grade Serial Number Chip DS2401Z+T&R

^{September 17, 2025 News — Against the backdrop of growing demand for IoT device identification and asset management, silicon serial number chips are becoming critical components for hardware authentication and product traceability. The DS2401Z+T&R, a 1-Wire interface chip integrating a 48-bit unique serial number, offers an ideal identification solution for consumer electronics, industrial equipment, and medical instruments with its exceptional reliability and simple connectivity.}

^{I. Core Technical Features}

^{Utilizing a unique 1-Wire communication protocol, it achieves dual functions of data communication and power supply through a single data line. This interface supports a standard 15.3kbps communication rate, and the hardware design requires only one GPIO pin and an external pull-up resistor, significantly simplifying the system connection scheme. Its open-drain output structure supports multi-device parallel connection, enabling addressed access through identification serial numbers.}

The DS2401Z+T&R uses the 1-Wire communication protocol, and its bus controller circuit design is mainly divided into two configuration modes:

Open-Drain Output Mode (Recommended)

^Features:

^{Uses open-drain GPIO output, requires external pull-up resistor (typical value 4.7kΩ)}

^{Supports bus powering, can draw operating power from the data line}

^{Excellent bus collision handling capability}

^{Recommended for most application scenarios}

^{Standard TTL Mode}

Features:

^{Uses push-pull output GPIO}

^{Requires series current-limiting resistor (100Ω)}

^{Shorter communication distance}

^{Suitable for space-constrained designs}

^{Typical Application Configuration}

^{Design Considerations}

^{1.ESD Protection: Add TVS diode (e.g., ESD9B5.0ST5G) to data line}

^{2.Filter Design: Connect 100pF capacitor between data line and ground to filter high-frequency noise}

^{3.Wiring Specifications:}

^{Avoid parallel routing with high-frequency signal lines}

^{Keep branch length < 10cm}

^{Use twisted-pair cable to extend communication distance}

^{Performance Optimization Suggestions
Long-Distance Communication (1-3 meters):}

^{Reduce pull-up resistor to 1kΩ}

^{Lower communication rate to 5kbps}

^{Use shielded twisted-pair cable}

^{High-Noise Environments:}

• ^{Add 100Ω series resistor}

• ^{Incorporate ferrite bead filtering on data line}

• ^{Adopt differential signal transmission (requires conversion chip)}

^{​This optimized configuration ensures reliable communication for the DS2401Z across various application environments. The simplified design enables rapid integration into existing systems, providing stable and unique device identification functionality.}

Initialization Sequence: "Reset and Presence Pulse"

Controller sends reset pulse

^{Slave Responds with Presence Pulse}

^{Response Timing: 15-60μs after controller releases the bus}

^{Response Characteristic: Slave pulls the bus low for 60-240μs}

^{Recognition Criterion: Controller detects low level within the reception window}

^{Key Operation Points}

^{Reset pulse width must be greater than 480μs}

^{Bus recovery time must ensure sufficient pull-up resistor charging time}

^{Presence pulse detection should be completed within 60μs after releasing the bus}

^{Rise time control must meet the t ≤ 1μs requirement}

Write Slot Timing Characteristics

Write '1' Slot

^{Bus States:}

^{Logic 1: V_BUS > 2.8V (maintained by pull-up resistor)}

^{Logic 0: V_BUS < 0.4V (pulled low by controller or slave)}

^{Operation Key Points
1.Write Operation}

^{Write '1': Pull low for 1-15μs then release}

^{Write '0': Pull low for 60-120μs then release}

^{Slave samples within 15-30μs window}

^{2.Read Operation}

^{Controller pulls low for >1μs then releases}

^{Samples bus state after 15μs}

^{Slave outputs data after controller pulls low}

^{3.Timing Control}

^{≥1μs recovery time required between time slots}

^{Bus rise time must be ≤1μs}

^{Bus pull-up resistor affects rise time}

^{Design Recommendations}

^{Use 4.7kΩ pull-up resistor to ensure fast rise time}

^{Configure controller GPIO as open-drain output mode}

^{Reduce pull-up resistor value for long-distance communication}

^{Add 100pF capacitor to filter high-frequency noise}

^{Avoid bus capacitance exceeding 800pF}

^{This read/write timing diagram clarifies the temporal requirements for DS2401Z communication. Correct timing control is critical to ensuring 1-Wire communication reliability. All timing parameters must be strictly followed during programming, especially when implementing the 1-Wire protocol in embedded software.}

^{Core Circuit Structure
The equivalent circuit of the DS2401Z+T&R primarily consists of the following key components:}

^{1. Bidirectional Interface Circuit}

^{2. Internal MOSFET Structure}

3. Protection Diodes

^{Functional Module Description}
 

^{Receive Channel (Rx)}

^{High-impedance input buffer}

^{Schmitt trigger input}

^{Voltage comparator for signal detection}

^{Working Principle}

^{1.Data Transmission}

^{Controller pulls DATA line low to activate MOSFET}

^{Internal logic controls MOSFET turn-on/off}

^{Generates logic 0 and 1 signals}

^{2.Data Reception}

^{High-impedance input detects bus state}

^{Schmitt trigger eliminates noise}

^{Comparator identifies logic levels}

^{3.Power Management}

^{Supports bus-powered mode}

^{Internal voltage regulation provides stable operating voltage}

^{Power detection ensures normal operation}

^{Design Considerations
Pull-up Resistor Selection}

^{Standard applications: 4.7kΩ}

^{Long-distance communication: 1-2.2kΩ}

^{High-speed applications: 2.2kΩ}

_{ESD Protection}

_{Integrated 2kV HBM protection}

_{Additional external TVS diode recommended}

_{Avoid exceeding maximum absolute ratings}

_{Layout Recommendations}

_{Keep DATA line short and straight}

_{Avoid parallel routing with high-frequency signals}

_{Add decoupling capacitors}

_{This equivalent circuit demonstrates the highly integrated design of the DS2401Z+T&R, achieving reliable communication through a simple interface, making it ideal for space-constrained application scenarios.}

Protection Characteristics

For procurement or further product information, please contact:86-0775-13434437778,

​Or visit the official website:https://mao.ecer.com/test/icsmodules.com/,Visit the ECER product page for details: [链接]