2

Pin and signal description

The figure below gives the pinout of the VFQFPN32 package in which the devices are delivered. The table below

describes the associated signals.

Figure 1. VQFN32 pinout

VFQFPN32

1

VPS

2

NiC

3

NiC

4

GPIO_PP

5

NiC

6

NiC

7

NiC

8

NiC

32 31 30 29 28 27 26 25

NiC

NiC

NiC

NiC

NiC

NiC

IRQ

RESET

24

23

22

21

20

19

18

17

9 10 11 12 13 14 15 16

Table 1. Pin descriptions

Signal

Type

Description

VPS

Input

Power supply. This pin must be connected to the 1.8 V or 3.3 V DC power rail supplied by the

motherboard.

GND

Input

GND has to be connected to the main motherboard ground.

SDA

Bidir

I2C serial data (open drain with no weak pull-up resistor)

SCL

Input

I2C serial clock (open drain with no weak pull-up resistor)

IRQ

Output

IRQ used by the TPM to generate an interrupt

RESET

Input

Reset used to re-initialize the device

GPIO_C

Input/output

General-purpose input/output. Defaults to low. GPIO Function could be modified by activating GPIO

mapped with NV storage Indices feature.

GPIO_D

Input/output

General-purpose input/output. Defaults to low. GPIO Function could be modified by activating GPIO

mapped with NV storage Indices feature.

GPIO_PP Input

Physical Presence, active high, internal pull-down. Used to indicate Physical Presence to the TPM.

GPIO Function could be modified by activating GPIO mapped with NV storage Indices feature.

GPIO_LP Input

By default: Used for activation and deactivation of the TPM Standby mode (TPMLowPowerByGpio).

The GPIO function could be modified by activating GPIOs mapped on the NV storage index feature.

NiC

-

Not internally connected: not connected to the die. May be left unconnected, but has no impact on

the TPM if connected.

Note:

The VQFN32 package has a central pad (PIN33) on the bottom, which is not connected to the die. This pin does

not impact the TPM, be it connected or not.

ST33TPHF2XI2C

Pin and signal description

DS14167 - Rev 1

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