Analog Devices Inc./Maxim Integrated DS2430AP+

Overview

DS2430AP+ from Analog Devices is a 256-bit 1-Wire EEPROM with 64-bit one-time programmable application register, operating from 2.8V to 5.25V across –40°C to +85°C in a 6-pin TSOC package. It provides guaranteed unique identity via 64-bit ROM (family code 14h), supports parasitic power, and communicates at up to 14.3 kbps over a single data line. Used for calibration storage, board ID, and revision tracking in industrial sensor nodes.

For engineers reviewing the DS2430AP+ datasheet, DS2430AP+ pinout, DS2430AP+ application, or DS2430AP+ equivalent, key selection considerations include 1-Wire bus compatibility, TSOC package footprint, EEPROM page size (32 bytes), application register one-time programmability, and CRC-8 integrity verification per ROM read.

Technical Context

The DS2430AP+ implements a hierarchical 1-Wire protocol requiring ROM function commands (e.g., Skip ROM CCh, Match ROM 55h) before memory access. Its internal architecture includes separate 256-bit EEPROM scratchpad, 64-bit application register scratchpad, status register, and 64-bit ROM with built-in CRC generator (X⁸ + X⁵ + X⁴ + 1).

Memory operations follow strict timing: Write Scratchpad (0Fh) requires address + data; Copy Scratchpad (55h) needs A5h validation key and tPROG hold time; Read Status (66h) returns FFh if application register is unprogrammed, FCh after lock. All data transfers occur LSB-first with open-drain signaling and external pullup.

Key Specifications

Pinout & Package

DS2430AP+ uses a 6-pin TSOC package with exposed pad (not electrically connected). Pin 1 = Ground, Pin 2 = Data (open-drain 1-Wire I/O), Pins 3–6 = NC. Requires external pullup resistor (0.3kΩ–2.2kΩ) on Data line for reliable communication.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-Wire EEPROM applications.

Compared with DS2430AP+, DS2431+ offers greater EEPROM capacity but omits the application register lock mechanism essential for firmware integrity, while DS28EC20 adds crypto security at the expense of parasitic power operation and TSOC packaging - making DS2430AP+ optimal for cost-sensitive, space-constrained industrial ID and calibration use cases.

Availability

DS2430AP+ is available at Aetrix Electronics and suitable for industrial sensor calibration, PCB identification, and firmware version tagging requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle support.

Supply support for DS2430AP+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and connectivity.

The DS2430AP+ belongs to Analog Devices' 1-Wire EEPROM product line, designed specifically for low-pin-count, parasitic-powered identification and configuration storage in resource-constrained industrial and sensor applications.

FAQ

What is the pin configuration of the DS2430AP+ and how does it differ from the TO-92 variant?

The DS2430AP+ uses a 6-pin TSOC package with Pin 1 = Ground, Pin 2 = Data (open-drain), and Pins 3–6 = No Connect. Unlike the 3-pin TO-92 version (DS2430A+), the TSOC variant adds unused pins to accommodate surface-mount assembly and thermal relief - no functional difference in electrical behavior or protocol. The DS2430AP+ retains full 1-Wire compatibility and identical memory architecture as the TO-92 variant.

Does the DS2430AP+ require an external power supply or can it operate with parasitic power only?

The DS2430AP+ operates exclusively with parasitic power - it draws all operating current from the 1-Wire data line during active communication and requires no external VDD connection. This is confirmed by its internal block diagram showing "PARASITE POWER" feeding all circuit blocks and the absence of any VDD pin in the TSOC pinout. The DS2430AP+ functions reliably across 2.8V–5.25V with proper pullup design.

How is the 64-bit ROM structured in the DS2430AP+, and what role does the CRC play during enumeration?

The DS2430AP+ 64-bit ROM consists of an 8-bit family code (14h), a 48-bit factory-programmed unique serial number, and an 8-bit CRC computed using polynomial X⁸ + X⁵ + X⁴ + 1. During ROM Function Commands (e.g., Read ROM 33h), the CRC validates the integrity of the entire 64-bit value - if mismatched, the host controller rejects the device, ensuring only authentic, undamaged DS2430AP+ units respond on the 1-Wire bus.

Can the application register of the DS2430AP+ be rewritten after initial programming?

No - the application register of the DS2430AP+ is strictly one-time programmable. Once the Copy & Lock Application Register command (5Ah) with validation key A5h completes successfully, the register becomes permanently write-protected. Subsequent attempts to write to it result in ignored data; the status register reflects this lock state by clearing its two least significant bits (from FFh to FCh). This behavior is hardwired and irreversible in the DS2430AP+ silicon.

What is the maximum recommended pullup resistor value for reliable DS2430AP+ communication at 14.3 kbps?

The DS2430AP+ datasheet specifies that for reliable operation at full speed (14.3 kbps) with a single device, a pullup resistor up to 5 kΩ may suffice under ideal conditions, but recommends 0.3 kΩ to 2.2 kΩ for robust multidrop or noisy environments. Lower values (e.g., 1 kΩ) ensure faster rise times and better noise immunity, especially when multiple DS2430AP+ devices share the bus or when cable lengths exceed 10 meters.