LetsTrust TPM

provides cryptographic functions for your computer

LetsTrust TPM is an easy-to-use TPM (Trusted Platform Module) solution for the Raspberry Pi, based on the Infineon Optiga™ SLB 9670 TPM 2.0.

A hardware TPM has multiple uses, including authentication / signatures, storing crypto keys, and more.

The module can also be used as a True Hardware Random Number Generator (TRNG) if you need a good source of randomness!

LetsTrust TPM uses the SPI interface to communicate with the Pi. It is compatible with all Raspberry Pi single board computers (Pi 4, Pi 3B+, Pi 3, Pi 2, Pi 1, Pi Zero, Pi 400 with adapter cable).

Compact footprint so that more GPIO pins can be used without problems: 2x5 pins from pin 17 to pin 26 are occupied by LetsTrust.

LetsTrust TPM has a very low power consumption - in idle mode the SLB9670 (the main component) consumes only about 110 microAmps, in operation about 25 mA maximum. LetsTrust TPM is powered with 3.3 V supply voltage from the Raspberry Pi single board computer.

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TPM Features

Infineon Optiga™ SLB 9670 TPM 2.0
Compliant with TPM Specification 2.0 Rev. 01.38
Firmware >= 7.85
TRNG (True Random Number Generator) - True Hardware Random Number Generator

Design & Interface

Interface to the Pi: SPI
Compatible with all Raspberry Pi models released so far (including Pi 3, Pi Zero, etc.)
Compact size due to 2x5 pin headers, thus the remaining GPIO pins remain freely available
solderable with Raspberry Pi pins
fits in common standard cases with in