SEC2410 datasheet(21/283 Pages) MICROCHIP

21 / 283 page

 2013 - 2014 Microchip Technology Inc.

DS00001587C-page 21

SEC2410/SEC4410

SC_FCB/

GPIO29

O12

SmartCard Function Code

This pin is used in conjuction with SC_RST_N for type 2

synchronous cards to indicate the type of command to

be executed.

This pin is held low while SC_PSNT_N is low and card

power has not been applied, or while SmartCard block is

deactivated.

SC_IO/

GPIO31

VIO12

SmartCard Bidirectional Serial Data

The SmartCard bidirectional serial data pin should be

held low when the interface is not active.

SC_CLK/

GPIO28

VIO12

SmartCard Clock Output

This pin is the clock reference for communication with

the flash media card. This pin should be held low when

the interface is not active.

SC_SPU/

GPIO30

VIO12

SmartCard Standard or Proprietary Use

This pin is held low while SC_PSNT_N is low and card

power has not been applied, or while SmartCard block is

deactivated.

SC_RST_N/

GPIO27

VIO12

SmartCard Reset Output

A low pulse resets the card and triggers an ATR

response message. This pin should be held low when

the interface is not active.

VDD33

3.3 V Power

VAR_CRD_PWR/

GPIO10

I/O200

Variable Voltage Card Power: 1.8 V, 3.0 V, 3.3 V

(200 mA)

This pin should have a 1.0

μF Ceramic low ESR

Capacitor when configured for output.

OTP_ATEST

This is a test pin and should be left un-connected for

normal operation.

XTAL2

OCLKx

24 MHz Crystal

This is the other terminal of the crystal, or can be left

open when an external clock source is used to drive

XTAL1/CLKIN.

XTAL1/

CLKIN

ICLKx

24 MHz Crystal (External Clock Input)

This pin can be connected to one terminal of the crystal

or can be connected to an external 24 MHz clock when

a crystal is not used.

VDD12PLL_MON

This pin should be left unconnected - for testing only.

RBIAS

I-R

USB Transceiver Bias

A 12.0 k

Ω, ± 1.0% resistor is attached from VSS to this

pin in order to set the transceiver’s internal bias currents.

VDDA33

3.3 V Analog Power

TABLE 3-3:

SEC2410 PIN DESCRIPTIONS (CONTINUED)

Name

Buffer type

Description

64-QFN 72-QFN

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