DS8005 查看數據表（PDF） - Maxim Integrated

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DS8005

Smart Card Interface

Maxim Integrated 

DS8005

Smart Card Interface

Pin Description (continued)

PIN

NAME

FUNCTION

Smart Card Data-Line Output, Interface A. Card data communication line, contact C7. This pin is

11

I/OA only active if the first card interface is selected (SEL_AB low) and the interface has gone through an

activation sequence.

Smart Card Data-Line Output, Interface B. Card data communication line, contact C7. This pin is only

12

I/OB active if the second card interface is selected (SEL_AB high) and the interface has gone through an

activation sequence.

13

15

16

17

18

19

20

21

22

23

24, 25

26

27

PRESB

Interface B Card Presence Indicator. Active-high card presence input for the second card interface.

When the presence indicator becomes active, a debounce timeout begins. After 8ms (typ), the OFF

signal becomes active if the second card interface is selected (SEL_AB high), else the OFF2 signal

becomes active.

CLKA

RSTA

VCCA

Smart Card Clock, Interface A. Card clock, contact C3.

Smart Card Reset, Interface A. Card reset output from contact C2.

Smart Card Supply Voltage, Interface A. Decouple to CGND (card ground) with 2 x 100nF or 100 +

220nF capacitors (ESR < 100mΩ).

VDDA2

Smart Card Interface Supply. Connect to a 5V power supply to support 1.8V, 3.0V, and 5.0V cards. If

VDD ≥ 4.9V, this pin can be connected directly to VDD. Decouple this pin to GND using 100nF and 10µF

capacitors.

CMDVCC

RSTIN

VDD

GND

Activation Sequence Initiate. Active-low input from host.

Card Reset Input. Reset input from the host.

Supply Voltage

Digital Ground

OFF

Status Output for Selected Interface. Active-low interrupt output to the host. Includes a 20kΩ integrated

pullup resistor to VDD. This pin reflects fault events and PRES_ events on the currently selected

interface only (behaving as if it were a DS8024 with only one interface). The OFF2 pin should be used

to monitor presence events on the nonselected interface.

XTAL1,

XTAL2

I/OIN

Crystal/Clock Input. Connect an input from an external clock to XTAL1 or connect a crystal across

XTAL1 and XTAL2. Leave XTAL2 disconnected if driving XTAL1 from an external clock source.

I/O Input. Host-to-interface chip data I/O line.

OFF2

Status Output for Nonselected Interface. This pin passes through the presence signal for the

nonselected interface. If SEL_AB is low (the A interface is selected), this pin reflects the state of the

PRESB input. If SEL_AB is high (the B interface is selected), this pin reflects the state of the PRESA

input.

Interface Selection. This pin selects the interface the input pins (I/OIN, RSTIN, etc.) communicate with

and control. If SEL_AB is low, the A interface is selected. Activation sequences power up VCCA and

28

SEL_AB communication occurs with CLKA, I/OA, and RSTA. If SEL_AB is high, the B interface is selected. Both

interfaces can be powered and clocking at the same time. See the Switching A/B Interfaces section for

more information.

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