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.


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

Software support

  • as of Raspbian Stretch with kernel 4.14.85 build in support with a device tree overlay
  • build-in support for Windows 10 IoT (on Pi 2, 3, 3B+)

Good to know

  • The LetsTrust TPM board is developed in Germany
  • The PCB production of LetsTrust TPM is exclusively done by a Bavarian assembler
  • The TPM is optionally solderable
  • We offer custom designs from an edition of 100 pieces - contact us


Further information and links can be found at



Global Resellers


Germany, Austria and Switzerland