ST33TPHF20SPI datasheet(10/47 Pages) STMICROELECTRONICS

10 / 47 page

FIPS140-2 SECURITY POLICY

Page 10 of 47

NON-PROPRIETARY DOCUMENT

1.3.2

I2C configuration

Figure 13: TSSOP28 Pinout Diagram

Figure 14: VQFN32 Pinout Diagram

Next table gives a description of the products pins.

Table 7: ST33TPHF20 Pin definition (I²C configuration)

Signal

Type

Description

VPS

Input

Power supply. This pin must be connected to 1.8V or 3.3V

DC power rail supplied by the motherboard.

GND

Input

GND has to be connected to the main motherboard ground.

RESET

Input

Reset used to re-initialize the device

SCL

Input

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

SDA

Input/Output

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

PIRQ

Output

IRQ used by TPM to generate an interrupt

GPIO1

Input/Output

GPIO default to low (not used, reserved for future use)

GPIO2

Input/Output

GPIO default to low (not used, reserved for future use)

GPIO3

Input/Output

GPIO default to low (not used, reserved for future use)

Input

Physical presence, active high, internal pull-down. Used to

indicate Physical Presence to the TPM.

NiC

Not internally connected: not connected to the die. May be

left unconnected but no impact on TPM if connected.

Not Connected: connected to the die but not usable. May be

left unconnected. Internal pull-down.

SDA

GPIO3

SCL

GPIO2

NiC

PIRQ

VPS

NiC

GND

NiC

RESET

NiC

GPIO1

TSSOP28

VQFN32

VPS

24 NiC

NiC

23 NiC

NiC

22 NiC

21 NiC

NiC

20 NiC

19 NiC

NiC

18 PIRQ

NiC

17 RESET

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