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By default the TPM Click module 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 SPI bus can be chosen. To select the SPI, the following parts must be populated: R3-R6, C1 and header JP1 must be closed.

The default Emcraft SW doesn’t software does not support communication to TPM Click module via SPI.

Specification

 

On-board module

ST33KTPM2X, a STSAFE-TPM trusted platform module 2.0 from STM

Interface

I2C (default), SPI

Compatibility

mikroBUS™

Click board size

S (28.6 x 25.4mm)

Input voltage

3.3V

 

...

 TPM Click Electrical Specification

 

Description

Min

Typ

Max

Unit

Supply Voltage

3.0

3.3

3.6

V

I2C Interface Speed

0

-

1000

kHz

SPI Interface Speed

-

-

66

MHz

Operation Temperature Range

-40

25

105

°C

Current Consumption  @ Run

-

17.5

-

mA

Current Consumption  @ Standby

-

30

-

µA

Pin-out

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

Notes

Pin

image-20240226-084207.pngImage Modified

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

Label

Name

State

Description

SPI SEL

JP1

Open (Default)

I2C interface is selected

Closed

SPI is selected. R3-R6 and C1 must be installed to provide SPI connectivity.

 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