STA2416 datasheet(9/38 Pages) STMICROELECTRONICS

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STA2416

Block diagram and pins description

9/38

3.3

Pin description and assignment

Table 1 shows the pin list of the STA2416. There are 91 functional pins of which 25 are used

for device testing only (should not be connected in the application) and 24 supply pins. The

column “PU/PD” shows the pads implementing an internal weak pull-up/down, to fix value if

the pin is left open. This cannot replace an external pull-up/down.

The pads are grouped according to two different power supply values, as shown in column

VDD:

●

V1 for 3.3 V typical 2.7 - 3.6 V range

●

V2 for 1.8 V typical 1.55 - 1.95 V range

Finally the column “DIR” describes the pin directions:

●

I for Inputs

●

O for Outputs

●

I/O for Input/Outputs

●

O/t for trim-state outputs

(

Table 1.

Pin list

Name

Pin #

Description

DIR

PU/PD

VDD

PAD

Clock and test pins

B18

System clock

CMOS, 3.3V TTL

compatible

Schmidt trigger

NEAREST

A18

Reset

UNRIPE

A17

Flash reset

NWP

Flash write protect

CMOS 1.8V

SYS_CLK_REQ

C18

System clock request

I/O

CMOS, 3.3V TTL

compatible, 2mA

tri-state

slew rate control

LPO_CLK_P

Low power oscillator + /slow clock

input

LPO_CLK_N

V10

Low power oscillator -

LPO_CLK_OUT

R18

32MHz clock out

INT1

C14

External interrupt used also as

external wakeup

(1)

CMOS, 3.3V TTL

compatible

schmidt trigger

INT2

C15

Second external interrupt

(1)

BOOT

T10

Select external boot from EMI or

internal from ROM

(1)

CMOS 1.8V

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