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

NiC

2

GND

3

NiC

4

NiC

5

NiC

6

GPIO_LP

7

GPIO_PP

8

NiC

32 31 30 29 28 27 26 25

SPI_MISO

NiC

VPS

SPI_MOSI

SPI_CS

SPI_CLK

SPI_PIRQ

SPI_RST

24

23

22

21

20

19

18

17

9 10 11 12 13 14 15 16

33

NiC

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.

SPI_RST

Input

SPI Reset, active low, used to re-initialize the device. Must not be unconnected. External pull-up

required if it cannot be driven.

SPI_MISO

Output SPI Master Input, Slave Output (output from slave)

SPI_MOSI

Input

SPI Master Output, Slave Input (output from master)

SPI_CLK

Input

SPI Serial Clock (output from master)

SPI_CS (or

SPI_NSS)

Input

SPI Chip (or Slave) Select, internal pull-up (active low; output from master)

SPI_PIRQ

Output SPI IRQ, active low, open drain, used by TPM to generate an interrupt

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.

ST33TPHF2XSPI

Pin and signal description

DS14186 - Rev 1

page 4/35