Overview

The TPM-Click board provides a TCG-standardized standardised platform expanding trust from personal computing to connected devices. This board features the STMicroelectronics ST33KTPM2X, a STSAFE-TPM trusted platform module 2.0. T

The STSAFE-TPM is a secure element product range providing authentication, confidentiality and platform integrity services to protect OEMs against cloning, counterfeiting, malware injection and unauthorized production.The TPM Click module is compatible with mikroBUS™, excluding usage unauthorised production. The STSAFE-TPM includes turnkey products compliant with the Trusted Computing Group (TCG) standards that provide services to protect the confidentiality, integrity and authenticity of information and devices. The STSAFE-TPM devices are all Common Criteria (EAL4+) and FIPS certified.

The ST33KTPM2X device is a member of the ST STSAFE-TPM (trusted platform module) family of products, which offers a broad portfolio of standardised solutions for embedded, PC, mobile and computing applications.

The ST33KTPM2X is a TPM 2.0-compliant device, that is easy to integrate in an embedded design, using the standards-compliant SPI and I2C interfaces to the host SoC, such as the ST STM32MP1.

TPM-Click Module

The TPM-Click module is fully compatible with the Click / mikroBUS protocol. The only exception is use of the +5V power supply, which is not supported by the TPM-Click.

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By The default configuration of the TPM-Click module is to use the I²C Bus for communication with the host. The maximum speed of the I²C Bus is 1MHz. If a higher throughput is required, then a the SPI bus can be chosen. To select the SPI, the following parts must be populated:

• R3-R6

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• closed

• C1 closed

• JP1 closed.

The default Emcraft software does not support communication to TPM Click module via SPI.

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following picture shows the TPM-Click module, in the default configruation:

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Hardware Specification

High-Level Specification

The following are the key characteristics of the TPM-Click module:

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Electrical Specification

 The following is the electrical specification of the TPM-Click module:

Pin-out

This table shows how the pin-out on the TPM-Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
	NC	1	AN	PWM	16	PP	Physical Presence, active high, internal pull-down. Used to indicate Physical Presence to the TPM.
Reset	nRST	2	RST	INT	15	nIRQ	TPM interrupt request to the host, active low
NC by default, optional SPI Chip (or Slave) Select	CS	3	CS	RX	14	NC
NC by default, optional SPI Serial Clock	SCK	4	SCK	TX	13	NC
NC by default, optional SPI Master Input, Slave Output	MISO	5	MISO	SCL	12	SCL	I2C Clock
NC by default, optional SPI Master Output, Slave Input	MOSI	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	NC
Ground	GND	8	GND	GND	9	GND	Ground

 Onboard Settings

 References

1. DB5174 STSAFE-TPM trusted platform module 2.0 with a SPI or I²C interface https://www.st.com/resource/en/data_brief/st33ktpm2x.pdf

2. https://www.st.com/en/secure-mcus/st33ktpm2x.html#documentation