DS2405/T&R

Specialized Overview

The DS2405/T&R is a tape-and-reel packaged addressable switch utilizing the 1-Wire protocol. It features an open-drain N-channel MOSFET controlled by a unique, factory-lasered 64-bit registration number comprising an 8-bit family code (05h), a 48-bit serial number, and an 8-bit CRC. The device operates on parasitic power derived from the data line within a voltage range of 2.8V to 6.0V. It supports communication speeds up to 16.3kbits/s and functions across an operating temperature range of -40°C to +85°C.

Specialized Feature Summary

• Open-drain PIO pin controlled by matching 64-bit laser-engraved registration number
• Zero standby power requirement using parasite power from the 1-Wire bus
• Built-in multidrop controller for compatibility with MicroLAN products
• Direct connection to a single microprocessor port pin

Specialized Applications

• Multidrop control systems requiring independent device identification
• Closed-loop control applications via logic level sensing over the 1-Wire bus
• Microprocessor peripheral expansion using a single bidirectional data line

Specialized Procurement Notes

Verify the specific package variant required, as the /T&R suffix applies to TO-92, SOT-223, or TSOC packages. Confirm that the tape-and-reel format aligns with automated assembly equipment specifications. Ensure the ordering part number matches the desired physical footprint before finalizing procurement.

Specialized Selection Notes

Select this component when unique electronic identification and remote switching are required on a shared 1-Wire network. Verify that the system design accommodates the open-drain output configuration and provides appropriate pull-up resistance. Ensure the host microcontroller supports the standard Dallas Semiconductor 1-Wire protocol timing requirements.

Specialized Part Context

The DS2405 belongs to the Maxim Integrated 1-Wire interface family, designed for low-cost, high-density sensor and switch networks. The /T&R designation specifically indicates the tape-and-reel packaging format, which facilitates surface-mount assembly processes compared to bulk or tube packaging options.

Specialized Replacement Considerations

DS2405Z/T&R

Specialized FAQ

How does the DS2405 derive its operating power?

The device derives power entirely from the 1-Wire bus through parasite power, storing energy on an internal capacitor during high signal periods.

What is the function of the Active-Only Search ROM command?

This command allows the bus master to efficiently identify devices on a multidrop system that have their output pulldown turned on.

Can multiple DS2405 devices operate on the same bus?

Yes, multiple devices can reside on a common 1-Wire bus, where each is independently addressed and toggled using its unique 64-bit ROM code.