Analog Devices Inc./Maxim Integrated DS2465P+

Overview

DS2465P+ from Maxim Integrated is a DeepCover® secure authenticator IC integrating a SHA-256 coprocessor and a fully autonomous 1-Wire® master interface. It serves as a protocol bridge between I²C host systems and 1-Wire SHA-256 slave devices (e.g., DS28E15), performing time-critical 1-Wire waveform generation, active/strong pullup control, and cryptographic computation. Key confirmed parameters: 3.3V ±10% supply, -40°C to +85°C operating range, 6-pin TSOC package, 400kHz I²C interface, and two 32-byte user EEPROM pages with programmable protection.

For engineers reviewing the DS2465P+ datasheet, DS2465P+ pinout, DS2465P+ application, or DS2465P+ equivalent, this page delivers verified technical context for secure consumables authentication, feature enablement in embedded peripherals, and cryptographic offload in resource-constrained I²C-based systems - with emphasis on 1-Wire timing control, sleep-mode power management, and SHA-256 engine integration.

Technical Context

The DS2465P+ implements a self-timed 1-Wire master with configurable standard/overdrive speed modes, selectable active (low-impedance transistor) or passive (resistor-based) pullup, and software-controllable strong pullup for powering 1-Wire EEPROMs during memory copy or SHA operations. Its SHA-256 engine operates independently of host intervention once initiated.

Communication occurs exclusively via I²C (standard/fast mode, up to 400kHz), with all registers, scratchpad, and EEPROM mapped into a linear address space. The SLPZ pin provides hardware reset and sleep entry, reducing ICC to ≤1.0µA; wake-up time is 200µs. Internal timing registers (e.g., tRSTL, tMSP, tW0L) are user-configurable per speed mode via I²C writes to addresses 68h–6Dh.

Key Specifications

Pinout & Package

DS2465P+ is housed in a 6-pin TSOC (Thin Small Outline Package) with 0.95mm pitch, optimized for compact PCB layouts in space-constrained authentication modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar secure authenticator applications.

Compared with DS2465P+, DS28C36G/UK+ shifts security model toward PKI and removes 1-Wire master capability, while MAX32550GTL+ replaces dedicated coprocessor architecture with a programmable secure MCU - both require significant redesign of host interface and firmware logic.

Availability

DS2465P+ is available at Aetrix Electronics and suitable for printer consumables authentication, medical device consumables verification, and industrial sensor module identity binding requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for DS2465P+ 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

Maxim Integrated (now part of Analog Devices) designs high-performance analog and mixed-signal semiconductor solutions for industrial, communications, computing, and consumer markets.

The DS2465P+ belongs to the DeepCover® secure authenticator product line, engineered specifically to provide hardware-enforced cryptographic offload and tamper-resistant key storage for 1-Wire-based peripheral authentication in cost-sensitive, resource-constrained systems.

FAQ

What is the primary function of the DS2465P+ in a secure authentication system?

The DS2465P+ serves as a dedicated SHA-256 coprocessor and autonomous 1-Wire master, enabling host microcontrollers to authenticate 1-Wire SHA-256 slave devices (e.g., DS28E15) without implementing time-critical 1-Wire timing or cryptographic algorithms in firmware. Its core function is protocol bridging and cryptographic offload - DS2465P+ handles reset/presence detection, byte reads/writes, and SHA-256 computation, returning results via I²C. This reduces host MCU resource usage and strengthens security through hardware isolation of keys and operations.

Does the DS2465P+ support both standard and overdrive 1-Wire communication speeds?

Yes, the DS2465P+ supports both standard (15.4kbps) and overdrive (125kbps) 1-Wire speeds. Speed selection is controlled by the 1WS bit in the 1-Wire Master Configuration register (address 67h). When communicating with DeepCover SHA-256 slaves like DS28E15 - which operate exclusively in overdrive mode - the DS2465P+ must have 1WS set to 1. The DS2465P+ automatically adjusts all timing parameters (tRSTL, tMSP, tW0L, etc.) based on the selected speed, and its active pullup duration scales accordingly (e.g., 0.5µs in overdrive vs. 2.5µs in standard mode).

How does the DS2465P+ manage power consumption during inactive periods?

The DS2465P+ achieves ultra-low-power operation via its SLPZ pin: pulling SLPZ low places the device into sleep mode with ICC ≤1.0µA at VCC = 3.63V. In this state, the SHA engine, 1-Wire master, and I²C interface are disabled, but internal register and EEPROM contents are retained. Wake-up occurs within 200µs after SLPZ returns high, followed by automatic power-on reset. Additionally, the PDN bit in the 1-Wire Master Configuration register allows software-controlled power-down of the 1-Wire port (IO pin) while keeping the DS2465P+ powered - useful for resetting attached 1-Wire slaves without full device reset.

Can the DS2465P+ directly power 1-Wire EEPROM devices during memory copy operations?

Yes, the DS2465P+ provides a strong pullup function that delivers up to 4mA through its internal low-impedance path to power 1-Wire EEPROMs (e.g., DS28E15) during scratchpad-to-memory copy or SHA-256 computation. Activation is controlled by the SPU bit in the 1-Wire Master Configuration register (67h) and must be enabled immediately before issuing the relevant 1-Wire command. Unlike the active pullup (which pulses per time slot), the strong pullup remains active until the next 1-Wire command, PDN activation, or SPU bit clear - ensuring sustained voltage compliance during high-current EEPROM write cycles.

What type of memory is available for user data storage on the DS2465P+?

The DS2465P+ provides two 32-byte pages (64 bytes total) of nonvolatile user EEPROM, located at addresses 80h–9Fh (page 0) and A0h–BFh (page 1). Each page supports multiple programmable protection options including write-disable, write-protect, and password-protected write access. Programming current is 2mA with 10ms per 32-bit segment, and endurance is rated at 100,000 write/erase cycles at +85°C. Data retention exceeds 10 years at +85°C. Factory-programmed identification data (e.g., 70h = 55h, 73h = 00h) resides in read-only ROM and is inaccessible for modification.