ST72321R7-Auto datasheet(25/243 Pages) STMICROELECTRONICS

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ST72321xx-Auto

Package pinout and pin description

Doc ID 13829 Rev 1

25/243

Legend / Abbreviations for Table 3:

Type:

I = input

O = output

S = supply

Input level:

A = dedicated analog input

In/Output level:

C = CMOS 0.3VDD/0.7VDD

CT = CMOS 0.3VDD/0.7VDD with input trigger

Output level:

HS = 20mA high sink (on N-buffer only)

Port and control configuration:

●

Input:

float = floating

wpu = weak pull-up

int = interrupt(a)

ana = analog

●

Output:

OD = open-drain(b)

PP = push-pull

PE2

(Flash device)

I/O CT

Port E2

Caution: In Flash devices this port

is always input with weak pull-up.

PE2

(ROM device)

Port E2

Caution: In ROM devices, no

weak pull-up present on this port.

In LQFP44 this pin is not

connected to an internal pull-up

like other unbonded pins. It is

recommended to configure it as

output push-pull to avoid added

current consumption.

PE3

I/O CT

Port E3

It is mandatory to connect all available VDD and VAREF pins to the supply voltage and all VSS and VSSA pins to ground.

OSC1 and OSC2 pins connect a crystal/ceramic resonator or an external source to the on-chip oscillator; see Section 6:

Supply, reset and clock management and Section 19.5: Clock and timing characteristics on page 195 for more details.

Table 3.

Device pin description (continued)

Pin No.

Pin name

Level

Port

Main

function

(after

reset)

Alternate function

Input

Output

In the interrupt input column, “eiX” defines the associated external interrupt vector. If the weak pull-up column

(wpu) is merged with the interrupt column (int), then the I/O configuration is pull-up interrupt input, otherwise

the configuration is floating interrupt input.

In the open-drain output column, “T” defines a true open-drain I/O (P-Buffer and protection diode to VDD are not

implemented). See Section 9: I/O ports on page 70 and Section 19.8: I/O port pin characteristics on page 203

for more details.

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