ST7265X datasheet(10/166 Pages) STMICROELECTRONICS

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ST7265x

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PIN DESCRIPTION (Cont’d)

Legend / Abbreviations:

Type: I = input, O = output, S = supply

VDDF powered: I/O powered by the alternate sup-

ply rail, supplied by VDDF and VSSF.

In/Output level: CT = CMOS 0.3VDD/0.7VDD with

input trigger

Output level: HS = High Sink (on N-buffer only)

Port and control configuration:

– Input:float = floating, wpu = weak pull-up, int = in-

terrupt

– Output: OD = open drain, T = true open drain, PP

= push-pull, OP = pull-up enabled by option byte.

Refer to “I/O PORTS” on page 49 for more details

on the software configuration of the I/O ports.

The RESET configuration of each pin is shown in

bold.

Table 1. Device Pin Description

Pin Name

Level

Port / Control

Main

Function

(after reset)

Alternate Function

Input

Output

USBVSS

USB Digital ground

USBDM

I/O

USB bidirectional data (data -)

USBDP

I/O

USB bidirectional data (data +)

USBVCC

USB power supply, output by the on-chip USB

3.3V linear regulator.

Note: An external decoupling capacitor (typ.

100nF, min 47nF) must be connected be-

tween this pin and USBVSS.

USBVDD

USB Power supply voltage (4V - 5.5V)

Note: External decoupling capacitors (typ.

4.7µF+100nF, min 2.2µF+100nFmust be con-

nected between this pin and USBVSS.

VDDF

Power Line for alternate supply rail. Can be

used as input (with external supply) or output

(when using the on-chip voltage regulator).

Note: An external decoupling capacitor (min.

20nF) must be connected to this pin to stabi-

lize the regulator.

VSSF

Ground Line for alternate supply rail. Can be

used as input (with external supply) or output

(when using the on-chip voltage regulator)

PE5/DTC

I/O

X CT HS X

Port E5

DTC I/O with serial capability

(MMC_CMD)

PE6/DTC

I/O

X CT HS X

Port E6

DTC I/O with serial capability

(MMC_DAT)

PE7/DTC

I/O

X CT HS X

Port E7

DTC I/O with serial capability

(MMC_CLK)

PB0/DTC

I/O

Port B0

DTC

PB1/DTC

I/O

Port B1

DTC

PB2/DTC

I/O

Port B2

DTC

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