Analog Devices Inc./Maxim Integrated DS28E35P+T

The device signs authentication data using an on-chip ECDSA engine and an SHA-256 hash of EEPROM page data and a host challenge. Its private/public key pair can be generated internally or installed by the user, then optionally locked. Each unit also carries a factory-programmed, unique 64-bit ROM identifier used by the 1-Wire network and cryptographic operations.

LCDChip registers 6-SMD, J-Lead. The manufacturer ordering table identifies DS28E35P+T as a six-pin TSOC device in tape-and-reel format; its listed package code is D6+1. Check the controlled TSOC land pattern before layout rather than using the eight-pin TDFN-EP footprint.

Layout checks

• Use the TSOC pin-one marker and manufacturer footprint.
• Provide the specified 1-Wire pullup and observe bus timing.
• Keep IO loading within the host network design budget.

The expected local package JPG is absent and the production URL returns HTTP 404. Keep this draft unpublished until the asset is restored and inspected.

For the six-pin TSOC, pin 1 is GND, pin 2 is the open-drain 1-Wire IO requiring an external pullup, and pins 3 through 6 are not connected. The eight-pin TDFN-EP variant has a different pin assignment and an exposed pad; do not transfer that footprint or pin numbering to this P+T part.

Use the manufacturer timing tables and the full controlled data sheet for final implementation; the abridged sheet does not specify every command detail.

Another authenticator may differ in certificate handling, cryptographic commands, 1-Wire timing, memory protections, key provisioning, temperature grade, and package. Do not infer interchangeability from the 1-Wire interface alone. No unverified LCDChip substitute link is included.

Analog Devices' DS28E35 DeepCover Secure Authenticator with 1-Wire ECDSA and 1Kb User EEPROM, abridged data sheet Rev. 6, provides the public feature list, electrical limits, pin description, package and ordering table. Request the controlled full data sheet from the manufacturer for command-level integration.

Check marking, traceability, TSOC dimensions, and the ROM ID. Validate certificate and key provisioning, page protection, host challenge generation, signature verification, and failure behavior on the intended bus topology. Treat irreversible locks and counter use as controlled production steps.

Confirm production availability, controlled documentation, bus electrical limits, package drawing, ECDSA provisioning flow, and threat model with Analog Devices. Restore the production package image and verify it before formal publication.