DS2465P+T

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Full model: DS2465P+T

Manufacturer: Maxim Integrated (now Analog Devices)

Device type: 1-Wire cryptographic coprocessor (with SHA-256 engine)

Package: TSSOP-6 (Thin Shrink Small Outline Package)

Operating voltage: 2.8V ~ 5.25V

Operating temperature: -40°C ~ +85°C (industrial grade)

Suffix description: "+T" indicates tape & reel packaging

Crypto engine: SHA-256 hardware acceleration

1-Wire interface speed: standard mode 15.4kbps, overdrive mode 125kbps

User memory: 512-bit EEPROM (divided into 7 lockable areas)

Unique serial number: 64-bit ROM ID (factory fixed)

Current consumption: 1mA in active mode, 1μA in standby mode

Description

DeepCover® embedded security solutions cloak sensitive data under multiple layers of advanced physical security to provide the most secure key storage possible. The DeepCover Secure Authenticator (DS2465) is a SHA-256 coprocessor with built-in 1-Wire® master that provides the SHA-256 and memory functionality required by a host system to communicate with and operate a 1-Wire SHA-256 slave. In addition, it performs protocol conversion between the I2C master and any attached 1-Wire SHA-256 slaves. For 1-Wire line driving, internal user-adjustable timers relieve the system host processor from generating time-critical 1-Wire waveforms, supporting both standard and overdrive 1-Wire communication speeds. The 1-Wire line can be powered down under software control. Strong pullup features support 1-Wire power delivery to 1-Wire devices such as EEPROMs. When not in use, the DS2465 can be put in sleep mode where power consumption is minimal.

Features

   1. SHA-256 Engine to Operate a Symmetric-KeyBased Bidirectional Secure Authentication Model

   2. Two 32-Byte Pages of User EEPROM with Multiple Programmable Protection Options

   3. 1-Wire Master Port with Selectable Active or Passive 1-Wire Pullup

   4. Strong 1-Wire Pullup Provided by an Internal LowImpedance Signal Path

   5. 1-Wire Port Can Be Powered Down Under Software Control

   6. I2C Operating (Pullup) Voltage: 3.3V ±10%

   7. ±8kV ESD Protection on IO to GND (JESD22-A114 HBM, Typical)

   8. Operating Range: 3.3V ±10%, -40NC to +85NC

   9. 6-Pin TSOC Package

Pin definition (TSSOP-6)

Typical circuit connection

                                       MCU ──── DS2465P+T ──── 1-Wire device

                                       GPIO───DQ pin

                                                           │

                                                          4.7kΩ pull-up resistor

                                                           │

                                                         VCC(3.3V)

Typical application scenarios

   1. Smart consumables authentication: printer cartridges/medical consumables anti-counterfeiting

   2. Industrial sensor calibration: storage of encrypted calibration data

   3. IoT device ID management: secure device identity

   4. Blockchain edge node: hardware wallet key storage

Development considerations

   1. 1-Wire bus design:

       - Long-distance communication requires the addition of a 1kΩ pull-up resistor

       - Bus capacitance must be <800pF (line length ≤200m)

   2. Secure programming:

       - Once the key area is locked, it cannot be read permanently (only verification is possible)

       - It is recommended to enable continuous write verification mode

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